Curves: Hair to Curves rename in Cycles/EEVEE UI

Change uses of "Hair" in Render Settings UI in the property editor
and the "Hair Info" node to use the "Curves" name to reflect the
design described in T95355, where hair is just a use case of a more
general curves data type.

While these settings still affect the particle hair system,
the idea is that if we have to choose one naming scheme to align
with, we should choose the option that aligns with future plans
and current development efforts, especially since the particle
system is considered a legacy feature.

A few notes:
- "Principled Hair BSDF" is not affected since it's meant for hair.
- Python API property identifiers are not affected.

Differential Revision: https://developer.blender.org/D14573

6 files changed, 25 insertions, 25 deletions

diff --git a/intern/cycles/blender/addon/properties.py b/intern/cycles/blender/addon/properties.py
index 51b3b3d2bcb..ee051766c50 100644
--- a/intern/cycles/blender/addon/properties.py
+++ b/intern/cycles/blender/addon/properties.py
@@ -65,8 +65,8 @@ enum_panorama_types = (
 )
 
 enum_curve_shape = (
-    ('RIBBONS', "Rounded Ribbons", "Render hair as flat ribbon with rounded normals, for fast rendering"),
-    ('THICK', "3D Curves", "Render hair as 3D curve, for accurate results when viewing hair close up"),
+    ('RIBBONS', "Rounded Ribbons", "Render curves as flat ribbons with rounded normals, for fast rendering"),
+    ('THICK', "3D Curves", "Render curves as circular 3D geometry, for accurate results when viewing closely"),
 )
 
 enum_use_layer_samples = (
@@ -428,14 +428,14 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
     min_light_bounces: IntProperty(
         name="Min Light Bounces",
         description="Minimum number of light bounces. Setting this higher reduces noise in the first bounces, "
-        "but can also be less efficient for more complex geometry like hair and volumes",
+        "but can also be less efficient for more complex geometry like curves and volumes",
         min=0, max=1024,
         default=0,
     )
     min_transparent_bounces: IntProperty(
         name="Min Transparent Bounces",
         description="Minimum number of transparent bounces. Setting this higher reduces noise in the first bounces, "
-        "but can also be less efficient for more complex geometry like hair and volumes",
+        "but can also be less efficient for more complex geometry like curves and volumes",
         min=0, max=1024,
         default=0,
     )
@@ -649,8 +649,8 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
         default=False,
     )
     debug_use_hair_bvh: BoolProperty(
-        name="Use Hair BVH",
-        description="Use special type BVH optimized for hair (uses more ram but renders faster)",
+        name="Use Curves BVH",
+        description="Use special type BVH optimized for curves (uses more ram but renders faster)",
         default=True,
     )
     debug_use_compact_bvh: BoolProperty(
@@ -1270,7 +1270,7 @@ class CyclesCurveRenderSettings(bpy.types.PropertyGroup):
 
     shape: EnumProperty(
         name="Shape",
-        description="Form of hair",
+        description="Form of curves",
         items=enum_curve_shape,
         default='RIBBONS',
     )
@@ -1284,8 +1284,8 @@ class CyclesCurveRenderSettings(bpy.types.PropertyGroup):
     @classmethod
     def register(cls):
         bpy.types.Scene.cycles_curves = PointerProperty(
-            name="Cycles Hair Rendering Settings",
-            description="Cycles hair rendering settings",
+            name="Cycles Curves Rendering Settings",
+            description="Cycles curves rendering settings",
             type=cls,
         )
 
diff --git a/intern/cycles/blender/addon/ui.py b/intern/cycles/blender/addon/ui.py
index c97afa86fad..b7fd3e46669 100644
--- a/intern/cycles/blender/addon/ui.py
+++ b/intern/cycles/blender/addon/ui.py
@@ -11,7 +11,7 @@ from bl_ui.utils import PresetPanel
 from bpy.types import Panel
 
 from bl_ui.properties_grease_pencil_common import GreasePencilSimplifyPanel
-from bl_ui.properties_render import draw_hair_settings
+from bl_ui.properties_render import draw_curves_settings
 from bl_ui.properties_view_layer import ViewLayerCryptomattePanel, ViewLayerAOVPanel, ViewLayerLightgroupsPanel
 
 class CyclesPresetPanel(PresetPanel, Panel):
@@ -336,8 +336,8 @@ class CYCLES_RENDER_PT_subdivision(CyclesButtonsPanel, Panel):
         col.prop(cscene, "dicing_camera")
 
 
-class CYCLES_RENDER_PT_hair(CyclesButtonsPanel, Panel):
-    bl_label = "Hair"
+class CYCLES_RENDER_PT_curves(CyclesButtonsPanel, Panel):
+    bl_label = "Curves"
     bl_options = {'DEFAULT_CLOSED'}
 
     def draw(self, context):
@@ -353,13 +353,13 @@ class CYCLES_RENDER_PT_hair(CyclesButtonsPanel, Panel):
         if ccscene.shape == 'RIBBONS':
             col.prop(ccscene, "subdivisions", text="Curve Subdivisions")
 
-class CYCLES_RENDER_PT_hair_viewport_display(CyclesButtonsPanel, Panel):
+class CYCLES_RENDER_PT_curves_viewport_display(CyclesButtonsPanel, Panel):
     bl_label = "Viewport Display"
-    bl_parent_id = "CYCLES_RENDER_PT_hair"
+    bl_parent_id = "CYCLES_RENDER_PT_curves"
     bl_options = {'DEFAULT_CLOSED'}
 
     def draw(self, context):
-        draw_hair_settings(self, context)
+        draw_curves_settings(self, context)
 
 class CYCLES_RENDER_PT_volumes(CyclesButtonsPanel, Panel):
     bl_label = "Volumes"
@@ -757,7 +757,7 @@ class CYCLES_RENDER_PT_filter(CyclesButtonsPanel, Panel):
         col = layout.column(heading="Include")
         col.prop(view_layer, "use_sky", text="Environment")
         col.prop(view_layer, "use_solid", text="Surfaces")
-        col.prop(view_layer, "use_strand", text="Hair")
+        col.prop(view_layer, "use_strand", text="Curves")
         col.prop(view_layer, "use_volumes", text="Volumes")
 
         col = layout.column(heading="Use")
@@ -2218,8 +2218,8 @@ classes = (
     CYCLES_RENDER_PT_light_paths_fast_gi,
     CYCLES_RENDER_PT_volumes,
     CYCLES_RENDER_PT_subdivision,
-    CYCLES_RENDER_PT_hair,
-    CYCLES_RENDER_PT_hair_viewport_display,
+    CYCLES_RENDER_PT_curves,
+    CYCLES_RENDER_PT_curves_viewport_display,
     CYCLES_RENDER_PT_simplify,
     CYCLES_RENDER_PT_simplify_viewport,
     CYCLES_RENDER_PT_simplify_render,
diff --git a/release/scripts/startup/bl_ui/properties_render.py b/release/scripts/startup/bl_ui/properties_render.py
index 2a7af8357e7..2a904bf1084 100644
--- a/release/scripts/startup/bl_ui/properties_render.py
+++ b/release/scripts/startup/bl_ui/properties_render.py
@@ -484,7 +484,7 @@ class RENDER_PT_eevee_film(RenderButtonsPanel, Panel):
         sub.prop(props, "overscan_size", text="")
 
 
-def draw_hair_settings(self, context):
+def draw_curves_settings(self, context):
     layout = self.layout
     scene = context.scene
     rd = scene.render
@@ -497,7 +497,7 @@ def draw_hair_settings(self, context):
 
 
 class RENDER_PT_eevee_hair(RenderButtonsPanel, Panel):
-    bl_label = "Hair"
+    bl_label = "Curves"
     bl_options = {'DEFAULT_CLOSED'}
     COMPAT_ENGINES = {'BLENDER_EEVEE'}
 
@@ -506,7 +506,7 @@ class RENDER_PT_eevee_hair(RenderButtonsPanel, Panel):
         return (context.engine in cls.COMPAT_ENGINES)
 
     def draw(self, context):
-        draw_hair_settings(self, context)
+        draw_curves_settings(self, context)
 
 
 class RENDER_PT_eevee_performance(RenderButtonsPanel, Panel):
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 7095d8a4172..050e08348a0 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -6318,13 +6318,13 @@ static void rna_def_scene_render_data(BlenderRNA *brna)
   /* Hairs */
   prop = RNA_def_property(srna, "hair_type", PROP_ENUM, PROP_NONE);
   RNA_def_property_enum_items(prop, hair_shape_type_items);
-  RNA_def_property_ui_text(prop, "Hair Shape Type", "Hair shape type");
+  RNA_def_property_ui_text(prop, "Curves Shape Type", "Curves shape type");
   RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_glsl_update");
 
   prop = RNA_def_property(srna, "hair_subdiv", PROP_INT, PROP_NONE);
   RNA_def_property_range(prop, 0, 3);
   RNA_def_property_ui_text(
-      prop, "Additional Subdivision", "Additional subdivision along the hair");
+      prop, "Additional Subdivision", "Additional subdivision along the curves");
   RNA_def_property_update(prop, NC_SCENE | ND_RENDER_OPTIONS, "rna_Scene_glsl_update");
 
   /* Performance */
diff --git a/source/blender/nodes/NOD_static_types.h b/source/blender/nodes/NOD_static_types.h
index 60d25f85c5b..81817feddfe 100644
--- a/source/blender/nodes/NOD_static_types.h
+++ b/source/blender/nodes/NOD_static_types.h
@@ -81,7 +81,7 @@ DefNode(ShaderNode,     SH_NODE_LIGHT_PATH,         0,                      "LIG
 DefNode(ShaderNode,     SH_NODE_LIGHT_FALLOFF,      0,                      "LIGHT_FALLOFF",      LightFalloff,     "Light Falloff",     ""       )
 DefNode(ShaderNode,     SH_NODE_OBJECT_INFO,        0,                      "OBJECT_INFO",        ObjectInfo,       "Object Info",       ""       )
 DefNode(ShaderNode,     SH_NODE_PARTICLE_INFO,      0,                      "PARTICLE_INFO",      ParticleInfo,     "Particle Info",     ""       )
-DefNode(ShaderNode,     SH_NODE_HAIR_INFO,          0,                      "HAIR_INFO",          HairInfo,         "Hair Info",         ""       )
+DefNode(ShaderNode,     SH_NODE_HAIR_INFO,          0,                      "HAIR_INFO",          HairInfo,         "Curves Info",       ""       )
 DefNode(ShaderNode,     SH_NODE_POINT_INFO,         0,                      "POINT_INFO",         PointInfo,        "Point Info",        ""       )
 DefNode(ShaderNode,     SH_NODE_VOLUME_INFO,        0,                      "VOLUME_INFO",        VolumeInfo,       "Volume Info",       ""       )
 DefNode(ShaderNode,     SH_NODE_WIREFRAME,          def_sh_tex_wireframe,   "WIREFRAME",          Wireframe,        "Wireframe",         ""       )
diff --git a/source/blender/nodes/shader/nodes/node_shader_hair_info.cc b/source/blender/nodes/shader/nodes/node_shader_hair_info.cc
index 49910bd5c66..11d23e47735 100644
--- a/source/blender/nodes/shader/nodes/node_shader_hair_info.cc
+++ b/source/blender/nodes/shader/nodes/node_shader_hair_info.cc
@@ -37,7 +37,7 @@ void register_node_type_sh_hair_info()
 
   static bNodeType ntype;
 
-  sh_node_type_base(&ntype, SH_NODE_HAIR_INFO, "Hair Info", NODE_CLASS_INPUT);
+  sh_node_type_base(&ntype, SH_NODE_HAIR_INFO, "Curves Info", NODE_CLASS_INPUT);
   ntype.declare = file_ns::node_declare;
   node_type_gpu(&ntype, file_ns::node_shader_gpu_hair_info);