Merge branch '28' into custom-manipulatorscustom-manipulators

17 files changed, 328 insertions, 250 deletions

diff --git a/intern/cycles/blender/addon/presets.py b/intern/cycles/blender/addon/presets.py
index 82c4ffc6e50..17efb00abdb 100644
--- a/intern/cycles/blender/addon/presets.py
+++ b/intern/cycles/blender/addon/presets.py
@@ -32,14 +32,11 @@ class AddPresetIntegrator(AddPresetBase, Operator):
 
     preset_values = [
         "cycles.max_bounces",
-        "cycles.min_bounces",
         "cycles.diffuse_bounces",
         "cycles.glossy_bounces",
         "cycles.transmission_bounces",
         "cycles.volume_bounces",
-        "cycles.transparent_min_bounces",
         "cycles.transparent_max_bounces",
-        "cycles.use_transparent_shadows",
         "cycles.caustics_reflective",
         "cycles.caustics_refractive",
         "cycles.blur_glossy"
diff --git a/intern/cycles/blender/addon/properties.py b/intern/cycles/blender/addon/properties.py
index 309e44ccbb8..a50da3634f3 100644
--- a/intern/cycles/blender/addon/properties.py
+++ b/intern/cycles/blender/addon/properties.py
@@ -199,13 +199,13 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
                 name="AA Samples",
                 description="Number of antialiasing samples to render for each pixel",
                 min=1, max=2097151,
-                default=4,
+                default=128,
                 )
         cls.preview_aa_samples = IntProperty(
                 name="AA Samples",
                 description="Number of antialiasing samples to render in the viewport, unlimited if 0",
                 min=0, max=2097151,
-                default=4,
+                default=32,
                 )
         cls.diffuse_samples = IntProperty(
                 name="Diffuse Samples",
@@ -302,17 +302,9 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
                 description="Adaptively blur glossy shaders after blurry bounces, "
                             "to reduce noise at the cost of accuracy",
                 min=0.0, max=10.0,
-                default=0.0,
+                default=1.0,
                 )
 
-        cls.min_bounces = IntProperty(
-                name="Min Bounces",
-                description="Minimum number of bounces, setting this lower "
-                            "than the maximum enables probabilistic path "
-                            "termination (faster but noisier)",
-                min=0, max=1024,
-                default=3,
-                )
         cls.max_bounces = IntProperty(
                 name="Max Bounces",
                 description="Total maximum number of bounces",
@@ -345,26 +337,12 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
                 default=0,
                 )
 
-        cls.transparent_min_bounces = IntProperty(
-                name="Transparent Min Bounces",
-                description="Minimum number of transparent bounces, setting "
-                            "this lower than the maximum enables "
-                            "probabilistic path termination (faster but "
-                            "noisier)",
-                min=0, max=1024,
-                default=8,
-                )
         cls.transparent_max_bounces = IntProperty(
                 name="Transparent Max Bounces",
                 description="Maximum number of transparent bounces",
                 min=0, max=1024,
                 default=8,
                 )
-        cls.use_transparent_shadows = BoolProperty(
-                name="Transparent Shadows",
-                description="Use transparency of surfaces for rendering shadows",
-                default=True,
-                )
 
         cls.volume_step_size = FloatProperty(
                 name="Step Size",
@@ -469,7 +447,7 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
                             "higher values will be scaled down to avoid too "
                             "much noise and slow convergence at the cost of accuracy",
                 min=0.0, max=1e8,
-                default=0.0,
+                default=10.0,
                 )
 
         cls.debug_tile_size = IntProperty(
@@ -697,6 +675,9 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
 
         cls.debug_use_opencl_debug = BoolProperty(name="Debug OpenCL", default=False)
 
+        cls.debug_opencl_mem_limit = IntProperty(name="Memory limit", default=0,
+            description="Artificial limit on OpenCL memory usage in MB (0 to disable limit)")
+
     @classmethod
     def unregister(cls):
         del bpy.types.Scene.cycles
diff --git a/intern/cycles/blender/addon/ui.py b/intern/cycles/blender/addon/ui.py
index 756d3b15a89..130b9434255 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -140,7 +140,7 @@ def draw_samples_info(layout, context):
                       (ao * aa, ml * aa, sss * aa, vol * aa))
 
 
-class CyclesRender_PT_sampling(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_sampling(CyclesButtonsPanel, Panel):
     bl_label = "Sampling"
     bl_options = {'DEFAULT_CLOSED'}
 
@@ -215,7 +215,7 @@ class CyclesRender_PT_sampling(CyclesButtonsPanel, Panel):
         draw_samples_info(layout, context)
 
 
-class CyclesRender_PT_geometry(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_geometry(CyclesButtonsPanel, Panel):
     bl_label = "Geometry"
     bl_options = {'DEFAULT_CLOSED'}
 
@@ -271,7 +271,7 @@ class CyclesRender_PT_geometry(CyclesButtonsPanel, Panel):
         row.prop(ccscene, "maximum_width", text="Max Extension")
 
 
-class CyclesRender_PT_light_paths(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_light_paths(CyclesButtonsPanel, Panel):
     bl_label = "Light Paths"
     bl_options = {'DEFAULT_CLOSED'}
 
@@ -293,8 +293,6 @@ class CyclesRender_PT_light_paths(CyclesButtonsPanel, Panel):
         sub = col.column(align=True)
         sub.label("Transparency:")
         sub.prop(cscene, "transparent_max_bounces", text="Max")
-        sub.prop(cscene, "transparent_min_bounces", text="Min")
-        sub.prop(cscene, "use_transparent_shadows", text="Shadows")
 
         col.separator()
 
@@ -307,7 +305,6 @@ class CyclesRender_PT_light_paths(CyclesButtonsPanel, Panel):
         sub = col.column(align=True)
         sub.label(text="Bounces:")
         sub.prop(cscene, "max_bounces", text="Max")
-        sub.prop(cscene, "min_bounces", text="Min")
 
         sub = col.column(align=True)
         sub.prop(cscene, "diffuse_bounces", text="Diffuse")
@@ -316,7 +313,7 @@ class CyclesRender_PT_light_paths(CyclesButtonsPanel, Panel):
         sub.prop(cscene, "volume_bounces", text="Volume")
 
 
-class CyclesRender_PT_motion_blur(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_motion_blur(CyclesButtonsPanel, Panel):
     bl_label = "Motion Blur"
     bl_options = {'DEFAULT_CLOSED'}
 
@@ -357,7 +354,7 @@ class CyclesRender_PT_motion_blur(CyclesButtonsPanel, Panel):
         row.prop(cscene, "rolling_shutter_duration")
 
 
-class CyclesRender_PT_film(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_film(CyclesButtonsPanel, Panel):
     bl_label = "Film"
 
     def draw(self, context):
@@ -379,7 +376,7 @@ class CyclesRender_PT_film(CyclesButtonsPanel, Panel):
             sub.prop(cscene, "filter_width", text="Width")
 
 
-class CyclesRender_PT_performance(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_performance(CyclesButtonsPanel, Panel):
     bl_label = "Performance"
     bl_options = {'DEFAULT_CLOSED'}
 
@@ -400,6 +397,8 @@ class CyclesRender_PT_performance(CyclesButtonsPanel, Panel):
         sub.enabled = rd.threads_mode == 'FIXED'
         sub.prop(rd, "threads")
 
+        col.separator()
+
         sub = col.column(align=True)
         sub.label(text="Tiles:")
         sub.prop(cscene, "tile_order", text="")
@@ -409,19 +408,10 @@ class CyclesRender_PT_performance(CyclesButtonsPanel, Panel):
 
         sub.prop(cscene, "use_progressive_refine")
 
-        subsub = sub.column(align=True)
-        subsub.prop(rd, "use_save_buffers")
-
-        col = split.column(align=True)
-
-        col.label(text="Viewport:")
-        col.prop(cscene, "debug_bvh_type", text="")
-        col.separator()
-        col.prop(cscene, "preview_start_resolution")
-
-        col.separator()
+        col = split.column()
 
         col.label(text="Final Render:")
+        col.prop(rd, "use_save_buffers")
         col.prop(rd, "use_persistent_data", text="Persistent Images")
 
         col.separator()
@@ -434,8 +424,14 @@ class CyclesRender_PT_performance(CyclesButtonsPanel, Panel):
         row.active = not cscene.debug_use_spatial_splits
         row.prop(cscene, "debug_bvh_time_steps")
 
+        col = layout.column()
+        col.label(text="Viewport Resolution:")
+        split = col.split()
+        split.prop(rd, "preview_pixel_size", text="")
+        split.prop(cscene, "preview_start_resolution")
+
 
-class CyclesRender_PT_layer_options(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_layer_options(CyclesButtonsPanel, Panel):
     bl_label = "Layer"
     bl_context = "render_layer"
 
@@ -471,7 +467,7 @@ class CyclesRender_PT_layer_options(CyclesButtonsPanel, Panel):
         col.prop(rl, "use_strand", "Use Hair")
 
 
-class CyclesRender_PT_layer_passes(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_layer_passes(CyclesButtonsPanel, Panel):
     bl_label = "Passes"
     bl_context = "render_layer"
     bl_options = {'DEFAULT_CLOSED'}
@@ -545,7 +541,7 @@ class CyclesRender_PT_layer_passes(CyclesButtonsPanel, Panel):
             col.prop(crl, "pass_debug_ray_bounces")
 
 
-class CyclesRender_PT_views(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_views(CyclesButtonsPanel, Panel):
     bl_label = "Views"
     bl_context = "render_layer"
     bl_options = {'DEFAULT_CLOSED'}
@@ -588,7 +584,7 @@ class CyclesRender_PT_views(CyclesButtonsPanel, Panel):
             row.prop(rv, "camera_suffix", text="")
 
 
-class CyclesRender_PT_denoising(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_denoising(CyclesButtonsPanel, Panel):
     bl_label = "Denoising"
     bl_context = "render_layer"
     bl_options = {'DEFAULT_CLOSED'}
@@ -653,7 +649,7 @@ class CyclesRender_PT_denoising(CyclesButtonsPanel, Panel):
         sub.prop(crl, "denoising_subsurface_indirect", text="Indirect", toggle=True)
 
 
-class Cycles_PT_post_processing(CyclesButtonsPanel, Panel):
+class CYCLES_PT_post_processing(CyclesButtonsPanel, Panel):
     bl_label = "Post Processing"
     bl_options = {'DEFAULT_CLOSED'}
 
@@ -672,7 +668,7 @@ class Cycles_PT_post_processing(CyclesButtonsPanel, Panel):
         col.prop(rd, "dither_intensity", text="Dither", slider=True)
 
 
-class CyclesCamera_PT_dof(CyclesButtonsPanel, Panel):
+class CYCLES_CAMERA_PT_dof(CyclesButtonsPanel, Panel):
     bl_label = "Depth of Field"
     bl_context = "data"
 
@@ -723,7 +719,7 @@ class CyclesCamera_PT_dof(CyclesButtonsPanel, Panel):
         sub.prop(ccam, "aperture_ratio", text="Ratio")
 
 
-class Cycles_PT_context_material(CyclesButtonsPanel, Panel):
+class CYCLES_PT_context_material(CyclesButtonsPanel, Panel):
     bl_label = ""
     bl_context = "material"
     bl_options = {'HIDE_HEADER'}
@@ -783,7 +779,7 @@ class Cycles_PT_context_material(CyclesButtonsPanel, Panel):
             split.separator()
 
 
-class CyclesObject_PT_motion_blur(CyclesButtonsPanel, Panel):
+class CYCLES_OBJECT_PT_motion_blur(CyclesButtonsPanel, Panel):
     bl_label = "Motion Blur"
     bl_context = "object"
     bl_options = {'DEFAULT_CLOSED'}
@@ -831,7 +827,7 @@ class CyclesObject_PT_motion_blur(CyclesButtonsPanel, Panel):
         sub.prop(cob, "motion_steps", text="Steps")
 
 
-class CyclesObject_PT_cycles_settings(CyclesButtonsPanel, Panel):
+class CYCLES_OBJECT_PT_cycles_settings(CyclesButtonsPanel, Panel):
     bl_label = "Cycles Settings"
     bl_context = "object"
     bl_options = {'DEFAULT_CLOSED'}
@@ -899,24 +895,27 @@ class CYCLES_OT_use_shading_nodes(Operator):
         return {'FINISHED'}
 
 
-def panel_node_draw(layout, id_data, output_type, input_name):
+def panel_node_draw(layout, id_data, output_types, input_name):
     if not id_data.use_nodes:
         layout.operator("cycles.use_shading_nodes", icon='NODETREE')
         return False
 
     ntree = id_data.node_tree
 
-    node = find_output_node(ntree, output_type)
-    if not node:
-        layout.label(text="No output node")
-    else:
+    node = find_output_node(ntree, output_types)
+    if node:
         input = find_node_input(node, input_name)
-        layout.template_node_view(ntree, node, input)
+        if input:
+            layout.template_node_view(ntree, node, input)
+        else:
+            layout.label(text="Incompatible output node")
+    else:
+        layout.label(text="No output node")
 
     return True
 
 
-class CyclesLamp_PT_preview(CyclesButtonsPanel, Panel):
+class CYCLES_LAMP_PT_preview(CyclesButtonsPanel, Panel):
     bl_label = "Preview"
     bl_context = "data"
     bl_options = {'DEFAULT_CLOSED'}
@@ -932,7 +931,7 @@ class CyclesLamp_PT_preview(CyclesButtonsPanel, Panel):
         self.layout.template_preview(context.lamp)
 
 
-class CyclesLamp_PT_lamp(CyclesButtonsPanel, Panel):
+class CYCLES_LAMP_PT_lamp(CyclesButtonsPanel, Panel):
     bl_label = "Lamp"
     bl_context = "data"
 
@@ -986,7 +985,7 @@ class CyclesLamp_PT_lamp(CyclesButtonsPanel, Panel):
             layout.label(text="Not supported, interpreted as sun lamp")
 
 
-class CyclesLamp_PT_nodes(CyclesButtonsPanel, Panel):
+class CYCLES_LAMP_PT_nodes(CyclesButtonsPanel, Panel):
     bl_label = "Nodes"
     bl_context = "data"
 
@@ -1000,11 +999,11 @@ class CyclesLamp_PT_nodes(CyclesButtonsPanel, Panel):
         layout = self.layout
 
         lamp = context.lamp
-        if not panel_node_draw(layout, lamp, 'OUTPUT_LAMP', 'Surface'):
+        if not panel_node_draw(layout, lamp, ('OUTPUT_LAMP',), 'Surface'):
             layout.prop(lamp, "color")
 
 
-class CyclesLamp_PT_spot(CyclesButtonsPanel, Panel):
+class CYCLES_LAMP_PT_spot(CyclesButtonsPanel, Panel):
     bl_label = "Spot Shape"
     bl_context = "data"
 
@@ -1029,7 +1028,7 @@ class CyclesLamp_PT_spot(CyclesButtonsPanel, Panel):
         col.prop(lamp, "show_cone")
 
 
-class CyclesWorld_PT_preview(CyclesButtonsPanel, Panel):
+class CYCLES_WORLD_PT_preview(CyclesButtonsPanel, Panel):
     bl_label = "Preview"
     bl_context = "world"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1042,7 +1041,7 @@ class CyclesWorld_PT_preview(CyclesButtonsPanel, Panel):
         self.layout.template_preview(context.world)
 
 
-class CyclesWorld_PT_surface(CyclesButtonsPanel, Panel):
+class CYCLES_WORLD_PT_surface(CyclesButtonsPanel, Panel):
     bl_label = "Surface"
     bl_context = "world"
 
@@ -1055,11 +1054,11 @@ class CyclesWorld_PT_surface(CyclesButtonsPanel, Panel):
 
         world = context.world
 
-        if not panel_node_draw(layout, world, 'OUTPUT_WORLD', 'Surface'):
+        if not panel_node_draw(layout, world, ('OUTPUT_WORLD',), 'Surface'):
             layout.prop(world, "horizon_color", text="Color")
 
 
-class CyclesWorld_PT_volume(CyclesButtonsPanel, Panel):
+class CYCLES_WORLD_PT_volume(CyclesButtonsPanel, Panel):
     bl_label = "Volume"
     bl_context = "world"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1073,10 +1072,10 @@ class CyclesWorld_PT_volume(CyclesButtonsPanel, Panel):
         layout = self.layout
 
         world = context.world
-        panel_node_draw(layout, world, 'OUTPUT_WORLD', 'Volume')
+        panel_node_draw(layout, world, ('OUTPUT_WORLD',), 'Volume')
 
 
-class CyclesWorld_PT_ambient_occlusion(CyclesButtonsPanel, Panel):
+class CYCLES_WORLD_PT_ambient_occlusion(CyclesButtonsPanel, Panel):
     bl_label = "Ambient Occlusion"
     bl_context = "world"
 
@@ -1101,7 +1100,7 @@ class CyclesWorld_PT_ambient_occlusion(CyclesButtonsPanel, Panel):
         row.prop(light, "distance", text="Distance")
 
 
-class CyclesWorld_PT_mist(CyclesButtonsPanel, Panel):
+class CYCLES_WORLD_PT_mist(CyclesButtonsPanel, Panel):
     bl_label = "Mist Pass"
     bl_context = "world"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1128,7 +1127,7 @@ class CyclesWorld_PT_mist(CyclesButtonsPanel, Panel):
         layout.prop(world.mist_settings, "falloff")
 
 
-class CyclesWorld_PT_ray_visibility(CyclesButtonsPanel, Panel):
+class CYCLES_WORLD_PT_ray_visibility(CyclesButtonsPanel, Panel):
     bl_label = "Ray Visibility"
     bl_context = "world"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1152,7 +1151,7 @@ class CyclesWorld_PT_ray_visibility(CyclesButtonsPanel, Panel):
         flow.prop(visibility, "scatter")
 
 
-class CyclesWorld_PT_settings(CyclesButtonsPanel, Panel):
+class CYCLES_WORLD_PT_settings(CyclesButtonsPanel, Panel):
     bl_label = "Settings"
     bl_context = "world"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1193,7 +1192,7 @@ class CyclesWorld_PT_settings(CyclesButtonsPanel, Panel):
         col.prop(cworld, "homogeneous_volume", text="Homogeneous")
 
 
-class CyclesMaterial_PT_preview(CyclesButtonsPanel, Panel):
+class CYCLES_MATERIAL_PT_preview(CyclesButtonsPanel, Panel):
     bl_label = "Preview"
     bl_context = "material"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1206,7 +1205,7 @@ class CyclesMaterial_PT_preview(CyclesButtonsPanel, Panel):
         self.layout.template_preview(context.material)
 
 
-class CyclesMaterial_PT_surface(CyclesButtonsPanel, Panel):
+class CYCLES_MATERIAL_PT_surface(CyclesButtonsPanel, Panel):
     bl_label = "Surface"
     bl_context = "material"
 
@@ -1218,11 +1217,11 @@ class CyclesMaterial_PT_surface(CyclesButtonsPanel, Panel):
         layout = self.layout
 
         mat = context.material
-        if not panel_node_draw(layout, mat, 'OUTPUT_MATERIAL', 'Surface'):
+        if not panel_node_draw(layout, mat, ('OUTPUT_MATERIAL', 'OUTPUT_EEVEE_MATERIAL'), 'Surface'):
             layout.prop(mat, "diffuse_color")
 
 
-class CyclesMaterial_PT_volume(CyclesButtonsPanel, Panel):
+class CYCLES_MATERIAL_PT_volume(CyclesButtonsPanel, Panel):
     bl_label = "Volume"
     bl_context = "material"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1238,10 +1237,10 @@ class CyclesMaterial_PT_volume(CyclesButtonsPanel, Panel):
         mat = context.material
         # cmat = mat.cycles
 
-        panel_node_draw(layout, mat, 'OUTPUT_MATERIAL', 'Volume')
+        panel_node_draw(layout, mat, ('OUTPUT_MATERIAL', 'OUTPUT_EEVEE_MATERIAL'), 'Volume')
 
 
-class CyclesMaterial_PT_displacement(CyclesButtonsPanel, Panel):
+class CYCLES_MATERIAL_PT_displacement(CyclesButtonsPanel, Panel):
     bl_label = "Displacement"
     bl_context = "material"
 
@@ -1254,10 +1253,10 @@ class CyclesMaterial_PT_displacement(CyclesButtonsPanel, Panel):
         layout = self.layout
 
         mat = context.material
-        panel_node_draw(layout, mat, 'OUTPUT_MATERIAL', 'Displacement')
+        panel_node_draw(layout, mat, ('OUTPUT_MATERIAL', 'OUTPUT_EEVEE_MATERIAL'), 'Displacement')
 
 
-class CyclesMaterial_PT_settings(CyclesButtonsPanel, Panel):
+class CYCLES_MATERIAL_PT_settings(CyclesButtonsPanel, Panel):
     bl_label = "Settings"
     bl_context = "material"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1312,7 +1311,7 @@ class CyclesMaterial_PT_settings(CyclesButtonsPanel, Panel):
         col.prop(mat, "pass_index")
 
 
-class CyclesTexture_PT_context(CyclesButtonsPanel, Panel):
+class CYCLES_TEXTURE_PT_context(CyclesButtonsPanel, Panel):
     bl_label = ""
     bl_context = "texture"
     bl_options = {'HIDE_HEADER'}
@@ -1353,7 +1352,7 @@ class CyclesTexture_PT_context(CyclesButtonsPanel, Panel):
                 split.prop(tex, "type", text="")
 
 
-class CyclesTexture_PT_node(CyclesButtonsPanel, Panel):
+class CYCLES_TEXTURE_PT_node(CyclesButtonsPanel, Panel):
     bl_label = "Node"
     bl_context = "texture"
 
@@ -1370,7 +1369,7 @@ class CyclesTexture_PT_node(CyclesButtonsPanel, Panel):
         layout.template_node_view(ntree, node, None)
 
 
-class CyclesTexture_PT_mapping(CyclesButtonsPanel, Panel):
+class CYCLES_TEXTURE_PT_mapping(CyclesButtonsPanel, Panel):
     bl_label = "Mapping"
     bl_context = "texture"
 
@@ -1403,7 +1402,7 @@ class CyclesTexture_PT_mapping(CyclesButtonsPanel, Panel):
         row.prop(mapping, "mapping_z", text="")
 
 
-class CyclesTexture_PT_colors(CyclesButtonsPanel, Panel):
+class CYCLES_TEXTURE_PT_colors(CyclesButtonsPanel, Panel):
     bl_label = "Color"
     bl_context = "texture"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1442,7 +1441,7 @@ class CyclesTexture_PT_colors(CyclesButtonsPanel, Panel):
             layout.template_color_ramp(mapping, "color_ramp", expand=True)
 
 
-class CyclesParticle_PT_textures(CyclesButtonsPanel, Panel):
+class CYCLES_PARTICLE_PT_textures(CyclesButtonsPanel, Panel):
     bl_label = "Textures"
     bl_context = "particle"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1473,7 +1472,7 @@ class CyclesParticle_PT_textures(CyclesButtonsPanel, Panel):
             layout.template_ID(slot, "texture", new="texture.new")
 
 
-class CyclesRender_PT_bake(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_bake(CyclesButtonsPanel, Panel):
     bl_label = "Bake"
     bl_context = "render"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1546,7 +1545,7 @@ class CyclesRender_PT_bake(CyclesButtonsPanel, Panel):
             sub.prop(cbk, "cage_extrusion", text="Ray Distance")
 
 
-class CyclesRender_PT_debug(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_debug(CyclesButtonsPanel, Panel):
     bl_label = "Debug"
     bl_context = "render"
     bl_options = {'DEFAULT_CLOSED'}
@@ -1574,20 +1573,30 @@ class CyclesRender_PT_debug(CyclesButtonsPanel, Panel):
         col.prop(cscene, "debug_use_qbvh")
         col.prop(cscene, "debug_use_cpu_split_kernel")
 
+        col.separator()
+
         col = layout.column()
         col.label('CUDA Flags:')
         col.prop(cscene, "debug_use_cuda_adaptive_compile")
         col.prop(cscene, "debug_use_cuda_split_kernel")
 
+        col.separator()
+
         col = layout.column()
         col.label('OpenCL Flags:')
         col.prop(cscene, "debug_opencl_kernel_type", text="Kernel")
         col.prop(cscene, "debug_opencl_device_type", text="Device")
         col.prop(cscene, "debug_opencl_kernel_single_program", text="Single Program")
         col.prop(cscene, "debug_use_opencl_debug", text="Debug")
+        col.prop(cscene, "debug_opencl_mem_limit")
+
+        col.separator()
+
+        col = layout.column()
+        col.prop(cscene, "debug_bvh_type")
 
 
-class CyclesParticle_PT_CurveSettings(CyclesButtonsPanel, Panel):
+class CYCLES_PARTICLE_PT_curve_settings(CyclesButtonsPanel, Panel):
     bl_label = "Cycles Hair Settings"
     bl_context = "particle"
 
@@ -1618,7 +1627,7 @@ class CyclesParticle_PT_CurveSettings(CyclesButtonsPanel, Panel):
         row.prop(cpsys, "use_closetip", text="Close tip")
 
 
-class CyclesScene_PT_simplify(CyclesButtonsPanel, Panel):
+class CYCLES_SCENE_PT_simplify(CyclesButtonsPanel, Panel):
     bl_label = "Simplify"
     bl_context = "scene"
     COMPAT_ENGINES = {'CYCLES'}
@@ -1771,47 +1780,47 @@ def get_panels():
 classes = (
     CYCLES_MT_sampling_presets,
     CYCLES_MT_integrator_presets,
-    CyclesRender_PT_sampling,
-    CyclesRender_PT_geometry,
-    CyclesRender_PT_light_paths,
-    CyclesRender_PT_motion_blur,
-    CyclesRender_PT_film,
-    CyclesRender_PT_performance,
-    CyclesRender_PT_layer_options,
-    CyclesRender_PT_layer_passes,
-    CyclesRender_PT_views,
-    CyclesRender_PT_denoising,
-    Cycles_PT_post_processing,
-    CyclesCamera_PT_dof,
-    Cycles_PT_context_material,
-    CyclesObject_PT_motion_blur,
-    CyclesObject_PT_cycles_settings,
+    CYCLES_RENDER_PT_sampling,
+    CYCLES_RENDER_PT_geometry,
+    CYCLES_RENDER_PT_light_paths,
+    CYCLES_RENDER_PT_motion_blur,
+    CYCLES_RENDER_PT_film,
+    CYCLES_RENDER_PT_performance,
+    CYCLES_RENDER_PT_layer_options,
+    CYCLES_RENDER_PT_layer_passes,
+    CYCLES_RENDER_PT_views,
+    CYCLES_RENDER_PT_denoising,
+    CYCLES_PT_post_processing,
+    CYCLES_CAMERA_PT_dof,
+    CYCLES_PT_context_material,
+    CYCLES_OBJECT_PT_motion_blur,
+    CYCLES_OBJECT_PT_cycles_settings,
     CYCLES_OT_use_shading_nodes,
-    CyclesLamp_PT_preview,
-    CyclesLamp_PT_lamp,
-    CyclesLamp_PT_nodes,
-    CyclesLamp_PT_spot,
-    CyclesWorld_PT_preview,
-    CyclesWorld_PT_surface,
-    CyclesWorld_PT_volume,
-    CyclesWorld_PT_ambient_occlusion,
-    CyclesWorld_PT_mist,
-    CyclesWorld_PT_ray_visibility,
-    CyclesWorld_PT_settings,
-    CyclesMaterial_PT_preview,
-    CyclesMaterial_PT_surface,
-    CyclesMaterial_PT_volume,
-    CyclesMaterial_PT_displacement,
-    CyclesMaterial_PT_settings,
-    CyclesTexture_PT_context,
-    CyclesTexture_PT_node,
-    CyclesTexture_PT_mapping,
-    CyclesTexture_PT_colors,
-    CyclesParticle_PT_textures,
-    CyclesRender_PT_bake,
-    CyclesRender_PT_debug,
-    CyclesParticle_PT_CurveSettings,
-    CyclesScene_PT_simplify,
+    CYCLES_LAMP_PT_preview,
+    CYCLES_LAMP_PT_lamp,
+    CYCLES_LAMP_PT_nodes,
+    CYCLES_LAMP_PT_spot,
+    CYCLES_WORLD_PT_preview,
+    CYCLES_WORLD_PT_surface,
+    CYCLES_WORLD_PT_volume,
+    CYCLES_WORLD_PT_ambient_occlusion,
+    CYCLES_WORLD_PT_mist,
+    CYCLES_WORLD_PT_ray_visibility,
+    CYCLES_WORLD_PT_settings,
+    CYCLES_MATERIAL_PT_preview,
+    CYCLES_MATERIAL_PT_surface,
+    CYCLES_MATERIAL_PT_volume,
+    CYCLES_MATERIAL_PT_displacement,
+    CYCLES_MATERIAL_PT_settings,
+    CYCLES_TEXTURE_PT_context,
+    CYCLES_TEXTURE_PT_node,
+    CYCLES_TEXTURE_PT_mapping,
+    CYCLES_TEXTURE_PT_colors,
+    CYCLES_PARTICLE_PT_textures,
+    CYCLES_RENDER_PT_bake,
+    CYCLES_RENDER_PT_debug,
+    CYCLES_PARTICLE_PT_curve_settings,
+    CYCLES_SCENE_PT_simplify,
 )
 
 
diff --git a/intern/cycles/blender/addon/version_update.py b/intern/cycles/blender/addon/version_update.py
index b2a745500a1..efd794461d6 100644
--- a/intern/cycles/blender/addon/version_update.py
+++ b/intern/cycles/blender/addon/version_update.py
@@ -302,3 +302,16 @@ def do_versions(self):
             cscene = scene.cycles
             if not cscene.is_property_set("light_sampling_threshold"):
                 cscene.light_sampling_threshold = 0.0
+
+    if bpy.data.version <= (2, 79, 0):
+        for scene in bpy.data.scenes:
+            cscene = scene.cycles
+            # Default changes
+            if not cscene.is_property_set("aa_samples"):
+                cscene.aa_samples = 4
+            if not cscene.is_property_set("preview_aa_samples"):
+                cscene.preview_aa_samples = 4
+            if not cscene.is_property_set("blur_glossy"):
+                cscene.blur_glossy = 0.0
+            if not cscene.is_property_set("sample_clamp_indirect"):
+                cscene.sample_clamp_indirect = 0.0
diff --git a/intern/cycles/blender/blender_camera.cpp b/intern/cycles/blender/blender_camera.cpp
index 40d6b25f2b7..b29711d30d3 100644
--- a/intern/cycles/blender/blender_camera.cpp
+++ b/intern/cycles/blender/blender_camera.cpp
@@ -544,7 +544,11 @@ void BlenderSync::sync_camera_motion(BL::RenderSettings& b_render,
 
 	if(tfm != cam->matrix) {
 		VLOG(1) << "Camera " << b_ob.name() << " motion detected.";
-		if(motion_time == -1.0f) {
+		if(motion_time == 0.0f) {
+			/* When motion blur is not centered in frame, cam->matrix gets reset. */
+			cam->matrix = tfm;
+		}
+		else if(motion_time == -1.0f) {
 			cam->motion.pre = tfm;
 			cam->use_motion = true;
 		}
@@ -573,7 +577,10 @@ void BlenderSync::sync_camera_motion(BL::RenderSettings& b_render,
 		float fov = 2.0f * atanf((0.5f * sensor_size) / bcam.lens / aspectratio);
 		if(fov != cam->fov) {
 			VLOG(1) << "Camera " << b_ob.name() << " FOV change detected.";
-			if(motion_time == -1.0f) {
+			if(motion_time == 0.0f) {
+				cam->fov = fov;
+			}
+			else if(motion_time == -1.0f) {
 				cam->fov_pre = fov;
 				cam->use_perspective_motion = true;
 			}
diff --git a/intern/cycles/blender/blender_curves.cpp b/intern/cycles/blender/blender_curves.cpp
index 42b985305ea..63b07936426 100644
--- a/intern/cycles/blender/blender_curves.cpp
+++ b/intern/cycles/blender/blender_curves.cpp
@@ -325,14 +325,14 @@ static bool ObtainCacheParticleVcol(Mesh *mesh,
 	return true;
 }
 
-static void set_resolution(BL::Object *b_ob, BL::Scene *scene, bool render)
+static void set_resolution(BL::Object *b_ob, BL::Scene *scene, BL::SceneLayer *sl, bool render)
 {
 	BL::Object::modifiers_iterator b_mod;
 	for(b_ob->modifiers.begin(b_mod); b_mod != b_ob->modifiers.end(); ++b_mod) {
 		if((b_mod->type() == b_mod->type_PARTICLE_SYSTEM) && ((b_mod->show_viewport()) || (b_mod->show_render()))) {
 			BL::ParticleSystemModifier psmd((const PointerRNA)b_mod->ptr);
 			BL::ParticleSystem b_psys((const PointerRNA)psmd.particle_system().ptr);
-			b_psys.set_resolution(*scene, *b_ob, (render)? 2: 1);
+			b_psys.set_resolution(*scene, *sl, *b_ob, (render)? 2: 1);
 		}
 	}
 }
@@ -912,7 +912,7 @@ void BlenderSync::sync_curves(Mesh *mesh,
 	ParticleCurveData CData;
 
 	if(!preview)
-		set_resolution(&b_ob, &b_scene, true);
+		set_resolution(&b_ob, &b_scene, &b_scene_layer, true);
 
 	ObtainCacheParticleData(mesh, &b_mesh, &b_ob, &CData, !preview);
 
@@ -1057,7 +1057,7 @@ void BlenderSync::sync_curves(Mesh *mesh,
 	}
 
 	if(!preview)
-		set_resolution(&b_ob, &b_scene, false);
+		set_resolution(&b_ob, &b_scene, &b_scene_layer, false);
 
 	mesh->compute_bounds();
 }
diff --git a/intern/cycles/blender/blender_mesh.cpp b/intern/cycles/blender/blender_mesh.cpp
index 75933c955ee..31f3e1e4859 100644
--- a/intern/cycles/blender/blender_mesh.cpp
+++ b/intern/cycles/blender/blender_mesh.cpp
@@ -50,8 +50,7 @@ enum {
  * Two triangles has vertex indices in the original Blender-side face.
  * If face is already a quad tri_b will not be initialized.
  */
-inline void face_split_tri_indices(const int num_verts,
-                                   const int face_flag,
+inline void face_split_tri_indices(const int face_flag,
                                    int tri_a[3],
                                    int tri_b[3])
 {
@@ -59,36 +58,37 @@ inline void face_split_tri_indices(const int num_verts,
 		tri_a[0] = 0;
 		tri_a[1] = 1;
 		tri_a[2] = 3;
-		if(num_verts == 4) {
-			tri_b[0] = 2;
-			tri_b[1] = 3;
-			tri_b[2] = 1;
-		}
+
+		tri_b[0] = 2;
+		tri_b[1] = 3;
+		tri_b[2] = 1;
 	}
-	else /*if(face_flag & FACE_FLAG_DIVIDE_13)*/ {
+	else {
+		/* Quad with FACE_FLAG_DIVIDE_13 or single triangle. */
 		tri_a[0] = 0;
 		tri_a[1] = 1;
 		tri_a[2] = 2;
-		if(num_verts == 4) {
-			tri_b[0] = 0;
-			tri_b[1] = 2;
-			tri_b[2] = 3;
-		}
+
+		tri_b[0] = 0;
+		tri_b[1] = 2;
+		tri_b[2] = 3;
 	}
 }
 
 /* Tangent Space */
 
 struct MikkUserData {
-	MikkUserData(const BL::Mesh& mesh_,
-	             BL::MeshTextureFaceLayer *layer_,
-	             int num_faces_)
-	: mesh(mesh_), layer(layer_), num_faces(num_faces_)
+	MikkUserData(const BL::Mesh& b_mesh,
+	             BL::MeshTextureFaceLayer *layer,
+	             int num_faces)
+	        : b_mesh(b_mesh),
+	          layer(layer),
+	          num_faces(num_faces)
 	{
 		tangent.resize(num_faces*4);
 	}
 
-	BL::Mesh mesh;
+	BL::Mesh b_mesh;
 	BL::MeshTextureFaceLayer *layer;
 	int num_faces;
 	vector<float4> tangent;
@@ -103,7 +103,7 @@ static int mikk_get_num_faces(const SMikkTSpaceContext *context)
 static int mikk_get_num_verts_of_face(const SMikkTSpaceContext *context, const int face_num)
 {
 	MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
-	BL::MeshTessFace f = userdata->mesh.tessfaces[face_num];
+	BL::MeshTessFace f = userdata->b_mesh.tessfaces[face_num];
 	int4 vi = get_int4(f.vertices_raw());
 
 	return (vi[3] == 0)? 3: 4;
@@ -112,9 +112,9 @@ static int mikk_get_num_verts_of_face(const SMikkTSpaceContext *context, const i
 static void mikk_get_position(const SMikkTSpaceContext *context, float P[3], const int face_num, const int vert_num)
 {
 	MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
-	BL::MeshTessFace f = userdata->mesh.tessfaces[face_num];
+	BL::MeshTessFace f = userdata->b_mesh.tessfaces[face_num];
 	int4 vi = get_int4(f.vertices_raw());
-	BL::MeshVertex v = userdata->mesh.vertices[vi[vert_num]];
+	BL::MeshVertex v = userdata->b_mesh.vertices[vi[vert_num]];
 	float3 vP = get_float3(v.co());
 
 	P[0] = vP.x;
@@ -148,9 +148,9 @@ static void mikk_get_texture_coordinate(const SMikkTSpaceContext *context, float
 		uv[1] = tfuv.y;
 	}
 	else {
-		int vert_idx = userdata->mesh.tessfaces[face_num].vertices()[vert_num];
+		int vert_idx = userdata->b_mesh.tessfaces[face_num].vertices()[vert_num];
 		float3 orco =
-			get_float3(userdata->mesh.vertices[vert_idx].undeformed_co());
+			get_float3(userdata->b_mesh.vertices[vert_idx].undeformed_co());
 		float2 tmp = map_to_sphere(make_float3(orco[0], orco[1], orco[2]));
 		uv[0] = tmp.x;
 		uv[1] = tmp.y;
@@ -160,12 +160,12 @@ static void mikk_get_texture_coordinate(const SMikkTSpaceContext *context, float
 static void mikk_get_normal(const SMikkTSpaceContext *context, float N[3], const int face_num, const int vert_num)
 {
 	MikkUserData *userdata = (MikkUserData*)context->m_pUserData;
-	BL::MeshTessFace f = userdata->mesh.tessfaces[face_num];
+	BL::MeshTessFace f = userdata->b_mesh.tessfaces[face_num];
 	float3 vN;
 
 	if(f.use_smooth()) {
 		int4 vi = get_int4(f.vertices_raw());
-		BL::MeshVertex v = userdata->mesh.vertices[vi[vert_num]];
+		BL::MeshVertex v = userdata->b_mesh.vertices[vi[vert_num]];
 		vN = get_float3(v.normal());
 	}
 	else {
@@ -250,7 +250,7 @@ static void mikk_compute_tangents(BL::Mesh& b_mesh,
 
 	for(int i = 0; i < nverts.size(); i++) {
 		int tri_a[3], tri_b[3];
-		face_split_tri_indices(nverts[i], face_flags[i], tri_a, tri_b);
+		face_split_tri_indices(face_flags[i], tri_a, tri_b);
 
 		tangent[0] = float4_to_float3(userdata.tangent[i*4 + tri_a[0]]);
 		tangent[1] = float4_to_float3(userdata.tangent[i*4 + tri_a[1]]);
@@ -376,7 +376,7 @@ static void attr_create_vertex_color(Scene *scene,
 
 			for(l->data.begin(c); c != l->data.end(); ++c, ++i) {
 				int tri_a[3], tri_b[3];
-				face_split_tri_indices(nverts[i], face_flags[i], tri_a, tri_b);
+				face_split_tri_indices(face_flags[i], tri_a, tri_b);
 
 				uchar4 colors[4];
 				colors[0] = color_float_to_byte(color_srgb_to_scene_linear_v3(get_float3(c->color1())));
@@ -469,7 +469,7 @@ static void attr_create_uv_map(Scene *scene,
 
 				for(l->data.begin(t); t != l->data.end(); ++t, ++i) {
 					int tri_a[3], tri_b[3];
-					face_split_tri_indices(nverts[i], face_flags[i], tri_a, tri_b);
+					face_split_tri_indices(face_flags[i], tri_a, tri_b);
 
 					float3 uvs[4];
 					uvs[0] = get_float3(t->uv1());
@@ -719,6 +719,11 @@ static void create_mesh(Scene *scene,
 	int numngons = 0;
 	bool use_loop_normals = b_mesh.use_auto_smooth() && (mesh->subdivision_type != Mesh::SUBDIVISION_CATMULL_CLARK);
 
+	/* If no faces, create empty mesh. */
+	if(numfaces == 0) {
+		return;
+	}
+
 	BL::Mesh::vertices_iterator v;
 	BL::Mesh::tessfaces_iterator f;
 	BL::Mesh::polygons_iterator p;
@@ -1056,6 +1061,7 @@ Mesh *BlenderSync::sync_mesh(BL::Object& b_ob,
 		BL::Mesh b_mesh = object_to_mesh(b_data,
 		                                 b_ob,
 		                                 b_scene,
+		                                 b_scene_layer,
 		                                 true,
 		                                 !preview,
 		                                 need_undeformed,
@@ -1080,7 +1086,7 @@ Mesh *BlenderSync::sync_mesh(BL::Object& b_ob,
 			}
 
 			/* free derived mesh */
-			b_data.meshes.remove(b_mesh, false);
+			b_data.meshes.remove(b_mesh, false, true, false);
 		}
 	}
 	mesh->geometry_flags = requested_geometry_flags;
@@ -1187,6 +1193,7 @@ void BlenderSync::sync_mesh_motion(BL::Object& b_ob,
 		b_mesh = object_to_mesh(b_data,
 		                        b_ob,
 		                        b_scene,
+		                        b_scene_layer,
 		                        true,
 		                        !preview,
 		                        false,
@@ -1300,7 +1307,7 @@ void BlenderSync::sync_mesh_motion(BL::Object& b_ob,
 		sync_curves(mesh, b_mesh, b_ob, true, time_index);
 
 	/* free derived mesh */
-	b_data.meshes.remove(b_mesh, false);
+	b_data.meshes.remove(b_mesh, false, true, false);
 }
 
 CCL_NAMESPACE_END
diff --git a/intern/cycles/blender/blender_object.cpp b/intern/cycles/blender/blender_object.cpp
index 991b834dcfa..a25ae278058 100644
--- a/intern/cycles/blender/blender_object.cpp
+++ b/intern/cycles/blender/blender_object.cpp
@@ -63,8 +63,26 @@ bool BlenderSync::object_is_mesh(BL::Object& b_ob)
 {
 	BL::ID b_ob_data = b_ob.data();
 
-	return (b_ob_data && (b_ob_data.is_a(&RNA_Mesh) ||
-		b_ob_data.is_a(&RNA_Curve) || b_ob_data.is_a(&RNA_MetaBall)));
+	if(!b_ob_data) {
+		return false;
+	}
+
+	if(b_ob.type() == BL::Object::type_CURVE) {
+		/* Skip exporting curves without faces, overhead can be
+		 * significant if there are many for path animation. */
+		BL::Curve b_curve(b_ob.data());
+
+		return (b_curve.bevel_object() ||
+		        b_curve.extrude() != 0.0f ||
+		        b_curve.bevel_depth() != 0.0f ||
+		        b_curve.dimensions() == BL::Curve::dimensions_2D ||
+		        b_ob.modifiers.length());
+	}
+	else {
+		return (b_ob_data.is_a(&RNA_Mesh) ||
+		        b_ob_data.is_a(&RNA_Curve) ||
+		        b_ob_data.is_a(&RNA_MetaBall));
+	}
 }
 
 bool BlenderSync::object_is_light(BL::Object& b_ob)
@@ -286,6 +304,29 @@ Object *BlenderSync::sync_object(BL::Depsgraph::duplis_iterator& b_dupli_iter,
 		return NULL;
 	}
 
+	/* Visibility flags for both parent and child. */
+	bool use_holdout = (layer_flag & render_layer.holdout_layer) != 0;
+	uint visibility = object_ray_visibility(b_ob) & PATH_RAY_ALL_VISIBILITY;
+
+	if(b_parent.ptr.data != b_ob.ptr.data) {
+		visibility &= object_ray_visibility(b_parent);
+	}
+
+	/* Make holdout objects on excluded layer invisible for non-camera rays. */
+	if(use_holdout && (layer_flag & render_layer.exclude_layer)) {
+		visibility &= ~(PATH_RAY_ALL_VISIBILITY - PATH_RAY_CAMERA);
+	}
+
+	/* Hide objects not on render layer from camera rays. */
+	if(!(layer_flag & render_layer.layer)) {
+		visibility &= ~PATH_RAY_CAMERA;
+	}
+
+	/* Don't export completely invisible objects. */
+	if(visibility == 0) {
+		return NULL;
+	}
+
 	/* key to lookup object */
 	ObjectKey key(b_parent, persistent_id, b_ob_instance);
 	Object *object;
@@ -326,8 +367,6 @@ Object *BlenderSync::sync_object(BL::Depsgraph::duplis_iterator& b_dupli_iter,
 	if(object_map.sync(&object, b_ob, b_parent, key))
 		object_updated = true;
 	
-	bool use_holdout = (layer_flag & render_layer.holdout_layer) != 0;
-	
 	/* mesh sync */
 	object->mesh = sync_mesh(b_ob, b_ob_instance, object_updated, hide_tris);
 
@@ -340,22 +379,6 @@ Object *BlenderSync::sync_object(BL::Depsgraph::duplis_iterator& b_dupli_iter,
 		object_updated = true;
 	}
 
-	/* visibility flags for both parent and child */
-	uint visibility = object_ray_visibility(b_ob) & PATH_RAY_ALL_VISIBILITY;
-	if(b_parent.ptr.data != b_ob.ptr.data) {
-		visibility &= object_ray_visibility(b_parent);
-	}
-
-	/* make holdout objects on excluded layer invisible for non-camera rays */
-	if(use_holdout && (layer_flag & render_layer.exclude_layer)) {
-		visibility &= ~(PATH_RAY_ALL_VISIBILITY - PATH_RAY_CAMERA);
-	}
-
-	/* hide objects not on render layer from camera rays */
-	if(!(layer_flag & render_layer.layer)) {
-		visibility &= ~PATH_RAY_CAMERA;
-	}
-
 	if(visibility != object->visibility) {
 		object->visibility = visibility;
 		object_updated = true;
@@ -519,6 +542,10 @@ void BlenderSync::sync_objects(float motion_time)
 	    ++b_dupli_iter)
 	{
 		BL::Object b_ob = b_dupli_iter->object();
+		if(!b_ob.is_visible()) {
+			continue;
+		}
+
 		progress.set_sync_status("Synchronizing object", b_ob.name());
 
 		/* load per-object culling data */
diff --git a/intern/cycles/blender/blender_python.cpp b/intern/cycles/blender/blender_python.cpp
index 3c769881bb7..300ccc06ea9 100644
--- a/intern/cycles/blender/blender_python.cpp
+++ b/intern/cycles/blender/blender_python.cpp
@@ -60,6 +60,8 @@ bool debug_flags_sync_from_scene(BL::Scene b_scene)
 	/* Backup some settings for comparison. */
 	DebugFlags::OpenCL::DeviceType opencl_device_type = flags.opencl.device_type;
 	DebugFlags::OpenCL::KernelType opencl_kernel_type = flags.opencl.kernel_type;
+	/* Synchronize shared flags. */
+	flags.viewport_static_bvh = get_enum(cscene, "debug_bvh_type");
 	/* Synchronize CPU flags. */
 	flags.cpu.avx2 = get_boolean(cscene, "debug_use_cpu_avx2");
 	flags.cpu.avx = get_boolean(cscene, "debug_use_cpu_avx");
@@ -106,6 +108,7 @@ bool debug_flags_sync_from_scene(BL::Scene b_scene)
 	}
 	/* Synchronize other OpenCL flags. */
 	flags.opencl.debug = get_boolean(cscene, "debug_use_opencl_debug");
+	flags.opencl.mem_limit = ((size_t)get_int(cscene, "debug_opencl_mem_limit"))*1024*1024;
 	flags.opencl.single_program = get_boolean(cscene, "debug_opencl_kernel_single_program");
 	return flags.opencl.device_type != opencl_device_type ||
 	       flags.opencl.kernel_type != opencl_kernel_type;
diff --git a/intern/cycles/blender/blender_session.cpp b/intern/cycles/blender/blender_session.cpp
index d8c3750cf20..f4e9da43454 100644
--- a/intern/cycles/blender/blender_session.cpp
+++ b/intern/cycles/blender/blender_session.cpp
@@ -60,6 +60,7 @@ BlenderSession::BlenderSession(BL::RenderEngine& b_engine,
   b_render(b_engine.render()),
   b_depsgraph(b_depsgraph),
   b_scene(b_scene),
+  b_scene_layer(b_engine.scene_layer()),
   b_v3d(PointerRNA_NULL),
   b_rv3d(PointerRNA_NULL),
   python_thread_state(NULL)
@@ -89,6 +90,7 @@ BlenderSession::BlenderSession(BL::RenderEngine& b_engine,
   b_render(b_scene.render()),
   b_depsgraph(b_depsgraph),
   b_scene(b_scene),
+  b_scene_layer(b_engine.scene_layer()),
   b_v3d(b_v3d),
   b_rv3d(b_rv3d),
   width(width),
@@ -133,9 +135,9 @@ void BlenderSession::create_session()
 	scene = new Scene(scene_params, session_params.device);
 
 	/* setup callbacks for builtin image support */
-	scene->image_manager->builtin_image_info_cb = function_bind(&BlenderSession::builtin_image_info, this, _1, _2, _3, _4, _5, _6, _7);
-	scene->image_manager->builtin_image_pixels_cb = function_bind(&BlenderSession::builtin_image_pixels, this, _1, _2, _3, _4);
-	scene->image_manager->builtin_image_float_pixels_cb = function_bind(&BlenderSession::builtin_image_float_pixels, this, _1, _2, _3, _4);
+	scene->image_manager->builtin_image_info_cb = function_bind(&BlenderSession::builtin_image_info, this, _1, _2, _3, _4, _5, _6, _7, _8);
+	scene->image_manager->builtin_image_pixels_cb = function_bind(&BlenderSession::builtin_image_pixels, this, _1, _2, _3, _4, _5);
+	scene->image_manager->builtin_image_float_pixels_cb = function_bind(&BlenderSession::builtin_image_float_pixels, this, _1, _2, _3, _4, _5);
 
 	/* create session */
 	session = new Session(session_params);
@@ -1017,7 +1019,8 @@ void BlenderSession::builtin_image_info(const string &builtin_name,
                                         int &width,
                                         int &height,
                                         int &depth,
-                                        int &channels)
+                                        int &channels,
+                                        bool& free_cache)
 {
 	/* empty image */
 	is_float = false;
@@ -1025,6 +1028,7 @@ void BlenderSession::builtin_image_info(const string &builtin_name,
 	height = 1;
 	depth = 0;
 	channels = 0;
+	free_cache = false;
 
 	if(!builtin_data)
 		return;
@@ -1038,6 +1042,7 @@ void BlenderSession::builtin_image_info(const string &builtin_name,
 		/* image data */
 		BL::Image b_image(b_id);
 
+		free_cache = !b_image.has_data();
 		is_float = b_image.is_float();
 		width = b_image.size()[0];
 		height = b_image.size()[1];
@@ -1098,7 +1103,8 @@ void BlenderSession::builtin_image_info(const string &builtin_name,
 bool BlenderSession::builtin_image_pixels(const string &builtin_name,
                                           void *builtin_data,
                                           unsigned char *pixels,
-                                          const size_t pixels_size)
+                                          const size_t pixels_size,
+                                          const bool free_cache)
 {
 	if(!builtin_data) {
 		return false;
@@ -1119,7 +1125,6 @@ bool BlenderSession::builtin_image_pixels(const string &builtin_name,
 
 	if(image_pixels && num_pixels * channels == pixels_size) {
 		memcpy(pixels, image_pixels, pixels_size * sizeof(unsigned char));
-		MEM_freeN(image_pixels);
 	}
 	else {
 		if(channels == 1) {
@@ -1138,6 +1143,16 @@ bool BlenderSession::builtin_image_pixels(const string &builtin_name,
 			}
 		}
 	}
+
+	if(image_pixels) {
+		MEM_freeN(image_pixels);
+	}
+
+	/* Free image buffers to save memory during render. */
+	if(free_cache) {
+		b_image.buffers_free();
+	}
+
 	/* Premultiply, byte images are always straight for Blender. */
 	unsigned char *cp = pixels;
 	for(size_t i = 0; i < num_pixels; i++, cp += channels) {
@@ -1151,7 +1166,8 @@ bool BlenderSession::builtin_image_pixels(const string &builtin_name,
 bool BlenderSession::builtin_image_float_pixels(const string &builtin_name,
                                                 void *builtin_data,
                                                 float *pixels,
-                                                const size_t pixels_size)
+                                                const size_t pixels_size,
+                                                const bool free_cache)
 {
 	if(!builtin_data) {
 		return false;
@@ -1176,7 +1192,6 @@ bool BlenderSession::builtin_image_float_pixels(const string &builtin_name,
 
 		if(image_pixels && num_pixels * channels == pixels_size) {
 			memcpy(pixels, image_pixels, pixels_size * sizeof(float));
-			MEM_freeN(image_pixels);
 		}
 		else {
 			if(channels == 1) {
@@ -1196,6 +1211,15 @@ bool BlenderSession::builtin_image_float_pixels(const string &builtin_name,
 			}
 		}
 
+		if(image_pixels) {
+			MEM_freeN(image_pixels);
+		}
+
+		/* Free image buffers to save memory during render. */
+		if(free_cache) {
+			b_image.buffers_free();
+		}
+
 		return true;
 	}
 	else if(b_id.is_a(&RNA_Object)) {
@@ -1279,7 +1303,7 @@ bool BlenderSession::builtin_image_float_pixels(const string &builtin_name,
 			BL::ShaderNodeTexPointDensity b_point_density_node(b_node);
 			int length;
 			int settings = background ? 1 : 0;  /* 1 - render settings, 0 - vewport settings. */
-			b_point_density_node.calc_point_density(b_scene, settings, &length, &pixels);
+			b_point_density_node.calc_point_density(b_scene, b_scene_layer, settings, &length, &pixels);
 		}
 	}
 
diff --git a/intern/cycles/blender/blender_session.h b/intern/cycles/blender/blender_session.h
index 254e8a049ff..7ae7bde1737 100644
--- a/intern/cycles/blender/blender_session.h
+++ b/intern/cycles/blender/blender_session.h
@@ -108,6 +108,7 @@ public:
 	BL::RenderSettings b_render;
 	BL::Depsgraph b_depsgraph;
 	BL::Scene b_scene;
+	BL::SceneLayer b_scene_layer;
 	BL::SpaceView3D b_v3d;
 	BL::RegionView3D b_rv3d;
 	string b_rlay_name;
@@ -159,15 +160,18 @@ protected:
 	                        int &width,
 	                        int &height,
 	                        int &depth,
-	                        int &channels);
+	                        int &channels,
+	                        bool &free_cache);
 	bool builtin_image_pixels(const string &builtin_name,
 	                          void *builtin_data,
 	                          unsigned char *pixels,
-	                          const size_t pixels_size);
+	                          const size_t pixels_size,
+	                          const bool free_cache);
 	bool builtin_image_float_pixels(const string &builtin_name,
 	                                void *builtin_data,
 	                                float *pixels,
-	                                const size_t pixels_size);
+	                                const size_t pixels_size,
+	                                const bool free_cache);
 
 	/* Update tile manager to reflect resumable render settings. */
 	void update_resumable_tile_manager(int num_samples);
diff --git a/intern/cycles/blender/blender_shader.cpp b/intern/cycles/blender/blender_shader.cpp
index c96727d5f64..b9af0dd0bf6 100644
--- a/intern/cycles/blender/blender_shader.cpp
+++ b/intern/cycles/blender/blender_shader.cpp
@@ -231,17 +231,11 @@ static void get_tex_mapping(TextureMapping *mapping,
 		mapping->max = get_float3(b_mapping.max());
 }
 
-static bool is_output_node(BL::Node& b_node)
-{
-	return (b_node.is_a(&RNA_ShaderNodeOutputMaterial)
-		    || b_node.is_a(&RNA_ShaderNodeOutputWorld)
-		    || b_node.is_a(&RNA_ShaderNodeOutputLamp));
-}
-
 static ShaderNode *add_node(Scene *scene,
                             BL::RenderEngine& b_engine,
                             BL::BlendData& b_data,
                             BL::Scene& b_scene,
+                            BL::SceneLayer b_scene_layer,
                             const bool background,
                             ShaderGraph *graph,
                             BL::ShaderNodeTree& b_ntree,
@@ -838,7 +832,7 @@ static ShaderNode *add_node(Scene *scene,
 
 		/* TODO(sergey): Use more proper update flag. */
 		if(true) {
-			b_point_density_node.cache_point_density(b_scene, settings);
+			b_point_density_node.cache_point_density(b_scene, b_scene_layer, settings);
 			scene->image_manager->tag_reload_image(
 			        point_density->filename.string(),
 			        point_density->builtin_data,
@@ -856,7 +850,7 @@ static ShaderNode *add_node(Scene *scene,
 		BL::Object b_ob(b_point_density_node.object());
 		if(b_ob) {
 			float3 loc, size;
-			point_density_texture_space(b_scene,
+			point_density_texture_space(b_scene, b_scene_layer,
 			                            b_point_density_node,
 			                            settings,
 			                            loc,
@@ -949,10 +943,36 @@ static ShaderOutput *node_find_output_by_name(ShaderNode *node,
 	return node->output(name.c_str());
 }
 
+static BL::ShaderNode find_output_node(BL::ShaderNodeTree& b_ntree)
+{
+	BL::ShaderNodeTree::nodes_iterator b_node;
+	BL::ShaderNode output_node(PointerRNA_NULL);
+
+	for(b_ntree.nodes.begin(b_node); b_node != b_ntree.nodes.end(); ++b_node) {
+		BL::ShaderNodeOutputMaterial b_output_node(*b_node);
+
+		if (b_output_node.is_a(&RNA_ShaderNodeOutputMaterial) ||
+		    b_output_node.is_a(&RNA_ShaderNodeOutputWorld) ||
+		    b_output_node.is_a(&RNA_ShaderNodeOutputLamp)) {
+			/* regular Cycles output node */
+			if(b_output_node.is_active_output()) {
+				output_node = b_output_node;
+				break;
+			}
+			else if(!output_node.ptr.data) {
+				output_node = b_output_node;
+			}
+		}
+	}
+
+	return output_node;
+}
+
 static void add_nodes(Scene *scene,
                       BL::RenderEngine& b_engine,
                       BL::BlendData& b_data,
                       BL::Scene& b_scene,
+                      BL::SceneLayer& b_scene_layer,
                       const bool background,
                       ShaderGraph *graph,
                       BL::ShaderNodeTree& b_ntree,
@@ -968,23 +988,7 @@ static void add_nodes(Scene *scene,
 	BL::Node::outputs_iterator b_output;
 
 	/* find the node to use for output if there are multiple */
-	bool found_active_output = false;
-	BL::ShaderNode output_node(PointerRNA_NULL);
-
-	for(b_ntree.nodes.begin(b_node); b_node != b_ntree.nodes.end(); ++b_node) {
-		if(is_output_node(*b_node)) {
-			BL::ShaderNodeOutputMaterial b_output_node(*b_node);
-
-			if(b_output_node.is_active_output()) {
-				output_node = b_output_node;
-				found_active_output = true;
-				break;
-			}
-			else if(!output_node.ptr.data && !found_active_output) {
-				output_node = b_output_node;
-			}
-		}
-	}
+	BL::ShaderNode output_node = find_output_node(b_ntree);
 
 	/* add nodes */
 	for(b_ntree.nodes.begin(b_node); b_node != b_ntree.nodes.end(); ++b_node) {
@@ -1043,6 +1047,7 @@ static void add_nodes(Scene *scene,
 				          b_engine,
 				          b_data,
 				          b_scene,
+				          b_scene_layer,
 				          background,
 				          graph,
 				          b_group_ntree,
@@ -1081,10 +1086,8 @@ static void add_nodes(Scene *scene,
 		else {
 			ShaderNode *node = NULL;
 
-			if(is_output_node(*b_node)) {
-				if(b_node->ptr.data == output_node.ptr.data) {
-					node = graph->output();
-				}
+			if(b_node->ptr.data == output_node.ptr.data) {
+				node = graph->output();
 			}
 			else {
 				BL::ShaderNode b_shader_node(*b_node);
@@ -1092,6 +1095,7 @@ static void add_nodes(Scene *scene,
 				                b_engine,
 				                b_data,
 				                b_scene,
+				                b_scene_layer,
 				                background,
 				                graph,
 				                b_ntree,
@@ -1155,6 +1159,7 @@ static void add_nodes(Scene *scene,
                       BL::RenderEngine& b_engine,
                       BL::BlendData& b_data,
                       BL::Scene& b_scene,
+                      BL::SceneLayer& b_scene_layer,
                       const bool background,
                       ShaderGraph *graph,
                       BL::ShaderNodeTree& b_ntree)
@@ -1164,6 +1169,7 @@ static void add_nodes(Scene *scene,
 	          b_engine,
 	          b_data,
 	          b_scene,
+	          b_scene_layer,
 	          background,
 	          graph,
 	          b_ntree,
@@ -1202,7 +1208,7 @@ void BlenderSync::sync_materials(bool update_all)
 			if(b_mat->use_nodes() && b_mat->node_tree()) {
 				BL::ShaderNodeTree b_ntree(b_mat->node_tree());
 
-				add_nodes(scene, b_engine, b_data, b_scene, !preview, graph, b_ntree);
+				add_nodes(scene, b_engine, b_data, b_scene, b_scene_layer, !preview, graph, b_ntree);
 			}
 			else {
 				DiffuseBsdfNode *diffuse = new DiffuseBsdfNode();
@@ -1273,7 +1279,7 @@ void BlenderSync::sync_world(bool update_all)
 		if(b_world && b_world.use_nodes() && b_world.node_tree()) {
 			BL::ShaderNodeTree b_ntree(b_world.node_tree());
 
-			add_nodes(scene, b_engine, b_data, b_scene, !preview, graph, b_ntree);
+			add_nodes(scene, b_engine, b_data, b_scene, b_scene_layer, !preview, graph, b_ntree);
 
 			/* volume */
 			PointerRNA cworld = RNA_pointer_get(&b_world.ptr, "cycles");
@@ -1368,7 +1374,7 @@ void BlenderSync::sync_lamps(bool update_all)
 
 				BL::ShaderNodeTree b_ntree(b_lamp->node_tree());
 
-				add_nodes(scene, b_engine, b_data, b_scene, !preview, graph, b_ntree);
+				add_nodes(scene, b_engine, b_data, b_scene, b_scene_layer, !preview, graph, b_ntree);
 			}
 			else {
 				float strength = 1.0f;
diff --git a/intern/cycles/blender/blender_sync.cpp b/intern/cycles/blender/blender_sync.cpp
index ab986766211..432f67f3b5e 100644
--- a/intern/cycles/blender/blender_sync.cpp
+++ b/intern/cycles/blender/blender_sync.cpp
@@ -54,6 +54,7 @@ BlenderSync::BlenderSync(BL::RenderEngine& b_engine,
   b_data(b_data),
   b_depsgraph(b_depsgraph),
   b_scene(b_scene),
+  b_scene_layer(b_engine.scene_layer()),
   shader_map(&scene->shaders),
   object_map(&scene->objects),
   mesh_map(&scene->meshes),
@@ -236,7 +237,6 @@ void BlenderSync::sync_integrator()
 	Integrator *integrator = scene->integrator;
 	Integrator previntegrator = *integrator;
 
-	integrator->min_bounce = get_int(cscene, "min_bounces");
 	integrator->max_bounce = get_int(cscene, "max_bounces");
 
 	integrator->max_diffuse_bounce = get_int(cscene, "diffuse_bounces");
@@ -245,8 +245,6 @@ void BlenderSync::sync_integrator()
 	integrator->max_volume_bounce = get_int(cscene, "volume_bounces");
 
 	integrator->transparent_max_bounce = get_int(cscene, "transparent_max_bounces");
-	integrator->transparent_min_bounce = get_int(cscene, "transparent_min_bounces");
-	integrator->transparent_shadows = get_boolean(cscene, "use_transparent_shadows");
 
 	integrator->volume_max_steps = get_int(cscene, "volume_max_steps");
 	integrator->volume_step_size = get_float(cscene, "volume_step_size");
@@ -613,14 +611,10 @@ SceneParams BlenderSync::get_scene_params(BL::Scene& b_scene,
 	else if(shadingsystem == 1)
 		params.shadingsystem = SHADINGSYSTEM_OSL;
 	
-	if(background)
+	if(background || DebugFlags().viewport_static_bvh)
 		params.bvh_type = SceneParams::BVH_STATIC;
 	else
-		params.bvh_type = (SceneParams::BVHType)get_enum(
-		        cscene,
-		        "debug_bvh_type",
-		        SceneParams::BVH_NUM_TYPES,
-		        SceneParams::BVH_STATIC);
+		params.bvh_type = SceneParams::BVH_DYNAMIC;
 
 	params.use_bvh_spatial_split = RNA_boolean_get(&cscene, "debug_use_spatial_splits");
 	params.use_bvh_unaligned_nodes = RNA_boolean_get(&cscene, "debug_use_hair_bvh");
@@ -794,6 +788,7 @@ SessionParams BlenderSync::get_session_params(BL::RenderEngine& b_engine,
 	}
 
 	params.start_resolution = get_int(cscene, "preview_start_resolution");
+	params.pixel_size = b_engine.get_preview_pixel_size(b_scene);
 
 	/* other parameters */
 	if(b_scene.render().threads_mode() == BL::RenderSettings::threads_mode_FIXED)
@@ -814,6 +809,7 @@ SessionParams BlenderSync::get_session_params(BL::RenderEngine& b_engine,
 			params.progressive = false;
 
 		params.start_resolution = INT_MAX;
+		params.pixel_size = 1;
 	}
 	else
 		params.progressive = true;
diff --git a/intern/cycles/blender/blender_sync.h b/intern/cycles/blender/blender_sync.h
index fda8cb390c2..69fee9551dd 100644
--- a/intern/cycles/blender/blender_sync.h
+++ b/intern/cycles/blender/blender_sync.h
@@ -43,6 +43,7 @@ class Mesh;
 class Object;
 class ParticleSystem;
 class Scene;
+class SceneLayer;
 class Shader;
 class ShaderGraph;
 class ShaderNode;
@@ -165,6 +166,7 @@ private:
 	BL::BlendData b_data;
 	BL::Depsgraph b_depsgraph;
 	BL::Scene b_scene;
+	BL::SceneLayer b_scene_layer;
 
 	id_map<void*, Shader> shader_map;
 	id_map<ObjectKey, Object> object_map;
diff --git a/intern/cycles/blender/blender_texture.cpp b/intern/cycles/blender/blender_texture.cpp
index b2e27b76189..dd08be3ddc9 100644
--- a/intern/cycles/blender/blender_texture.cpp
+++ b/intern/cycles/blender/blender_texture.cpp
@@ -34,7 +34,7 @@ void density_texture_space_invert(float3& loc,
 
 }  /* namespace */
 
-void point_density_texture_space(BL::Scene& b_scene,
+void point_density_texture_space(BL::Scene& b_scene, BL::SceneLayer& b_scene_layer,
                                  BL::ShaderNodeTexPointDensity& b_point_density_node,
                                  int settings,
                                  float3& loc,
@@ -48,6 +48,7 @@ void point_density_texture_space(BL::Scene& b_scene,
 	}
 	float3 min, max;
 	b_point_density_node.calc_point_density_minmax(b_scene,
+	                                               b_scene_layer,
 	                                               settings,
 	                                               &min[0],
 	                                               &max[0]);
diff --git a/intern/cycles/blender/blender_texture.h b/intern/cycles/blender/blender_texture.h
index 734231a85ec..c343d5dab92 100644
--- a/intern/cycles/blender/blender_texture.h
+++ b/intern/cycles/blender/blender_texture.h
@@ -22,7 +22,7 @@
 
 CCL_NAMESPACE_BEGIN
 
-void point_density_texture_space(BL::Scene& b_scene,
+void point_density_texture_space(BL::Scene& b_scene, BL::SceneLayer& b_scene_layer,
                                  BL::ShaderNodeTexPointDensity& b_point_density_node,
                                  const int settings,
                                  float3& loc,
diff --git a/intern/cycles/blender/blender_util.h b/intern/cycles/blender/blender_util.h
index ebbf325f95b..314bcaf23c4 100644
--- a/intern/cycles/blender/blender_util.h
+++ b/intern/cycles/blender/blender_util.h
@@ -46,13 +46,14 @@ void python_thread_state_restore(void **python_thread_state);
 static inline BL::Mesh object_to_mesh(BL::BlendData& data,
                                       BL::Object& object,
                                       BL::Scene& scene,
+                                      BL::SceneLayer scene_layer,
                                       bool apply_modifiers,
                                       bool render,
                                       bool calc_undeformed,
                                       Mesh::SubdivisionType subdivision_type)
 {
-	bool subsurf_mod_show_render;
-	bool subsurf_mod_show_viewport;
+	bool subsurf_mod_show_render = false;
+	bool subsurf_mod_show_viewport = false;
 
 	if(subdivision_type != Mesh::SUBDIVISION_NONE) {
 		BL::Modifier subsurf_mod = object.modifiers[object.modifiers.length()-1];
@@ -64,7 +65,7 @@ static inline BL::Mesh object_to_mesh(BL::BlendData& data,
 		subsurf_mod.show_viewport(false);
 	}
 
-	BL::Mesh me = data.meshes.new_from_object(scene, object, apply_modifiers, (render)? 2: 1, false, calc_undeformed);
+	BL::Mesh me = data.meshes.new_from_object(scene, scene_layer, object, apply_modifiers, (render)? 2: 1, false, calc_undeformed);
 
 	if(subdivision_type != Mesh::SUBDIVISION_NONE) {
 		BL::Modifier subsurf_mod = object.modifiers[object.modifiers.length()-1];