Cycles: change defaults for filter glossy, clamp and branched path AA.

We're adding some bias by default, which now I think is the right thing
to do from a usability point of view since you really need to use those
options anyway to get clean renders in a practical time.

Differential Revision: https://developer.blender.org/D2769

intern/cycles/blender/addon/properties.py

@@ -205,13 +205,13 @@ 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",
@@ -308,7 +308,7 @@ 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.max_bounces = IntProperty(
@@ -453,7 +453,7 @@ 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(

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

source/blender/blenkernel/BKE_blender_version.h

@@ -28,7 +28,7 @@
  * and keep comment above the defines.
  * Use STRINGIFY() rather than defining with quotes */
 #define BLENDER_VERSION         279
-#define BLENDER_SUBVERSION      0
+#define BLENDER_SUBVERSION      1
 /* Several breakages with 270, e.g. constraint deg vs rad */
 #define BLENDER_MINVERSION      270
 #define BLENDER_MINSUBVERSION   6