Cycles: Implement rolling shutter effect

This is an attempt to emulate real CMOS cameras which reads sensor by scanlines
and hence different scanlines are sampled at a different moment in time, which
causes so called rolling shutter effect. This effect will, for example, make
vertical straight lines being curved when doing horizontal camera pan.

This is controlled by the Shutter Type option in the Motion Blur panel.

Additionally, since scanline sampling is not instantaneous it's possible to have
motion blur on top of rolling shutter.

This is controlled by the Rolling Shutter Time slider which controls balance
between pure rolling shutter effect and pure motion blur effect.

Reviewers: brecht, juicyfruit, dingto, keir

Differential Revision: https://developer.blender.org/D1624

2 files changed, 24 insertions, 0 deletions

diff --git a/intern/cycles/blender/addon/properties.py b/intern/cycles/blender/addon/properties.py
index cbd1a8b1922..f48bc93cabf 100644
--- a/intern/cycles/blender/addon/properties.py
+++ b/intern/cycles/blender/addon/properties.py
@@ -531,6 +531,24 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
                 ),
             )
 
+        cls.rolling_shutter_type = EnumProperty(
+            name="Shutter Type",
+            default='NONE',
+            description="Type of rolling shutter effect matching CMOS-based cameras",
+            items=(
+                ('NONE', "None", "No rolling shutter effect used"),
+                ('TOP', "Top-Bottom", "Sensor is being scanned from top to bottom")
+                # TODO(seergey): Are there real cameras with different scanning direction?
+                ),
+            )
+
+        cls.rolling_shutter_duration = FloatProperty(
+            name="Rolling Shutter Duration",
+            description="Scanline \"exposure\" time for the rolling shutter effect",
+            default = 0.1,
+            min=0.0, max=1.0,
+            )
+
     @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 e2aa266d53b..495b2f21f7b 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -281,6 +281,12 @@ class CyclesRender_PT_motion_blur(CyclesButtonsPanel, Panel):
         row.operator("render.shutter_curve_preset", icon='LINCURVE', text="").shape = 'LINE'
         row.operator("render.shutter_curve_preset", icon='NOCURVE', text="").shape = 'MAX'
 
+        col = layout.column()
+        col.prop(cscene, "rolling_shutter_type")
+        row = col.row()
+        row.active = cscene.rolling_shutter_type != 'NONE'
+        row.prop(cscene, "rolling_shutter_duration")
+
 
 class CyclesRender_PT_film(CyclesButtonsPanel, Panel):
     bl_label = "Film"