Cycles: Change several default values (second batch).

This change the following values:
- World settings:
	- Use MIS: On
	- MIS Samples: 1
	- MIS Resolution: 1024

Enabling World MIS per default won't make simple backgrounds (flat background color) slower,
see previous commit. This gets disabled internally if World MIS is not actually needed.

intern/cycles/blender/addon/properties.py

@@ -796,20 +796,20 @@ class CyclesWorldSettings(bpy.types.PropertyGroup):
                 name="Multiple Importance Sample",
                 description="Use multiple importance sampling for the environment, "
                             "enabling for non-solid colors is recommended",
-                default=False,
+                default=True,
                 )
         cls.sample_map_resolution = IntProperty(
                 name="Map Resolution",
                 description="Importance map size is resolution x resolution; "
                             "higher values potentially produce less noise, at the cost of memory and speed",
                 min=4, max=8192,
-                default=256,
+                default=1024,
                 )
         cls.samples = IntProperty(
                 name="Samples",
                 description="Number of light samples to render for each AA sample",
                 min=1, max=10000,
-                default=4,
+                default=1,
                 )
         cls.max_bounces = IntProperty(
                 name="Max Bounces",

intern/cycles/blender/addon/version_update.py

@@ -254,3 +254,19 @@ def do_versions(self):
             # Volume Sampling
             if not cmat.is_property_set("volume_sampling"):
                 cmat.volume_sampling = 'DISTANCE'
+
+    if bpy.data.version <= (2, 76, 9):
+        for world in bpy.data.worlds:
+            cworld = world.cycles
+
+            # World MIS
+            if not cworld.is_property_set("sample_as_light"):
+                cworld.sample_as_light = False
+
+            # World MIS Samples
+            if not cworld.is_property_set("samples"):
+                cworld.samples = 4
+
+            # World MIS Resolution
+            if not cworld.is_property_set("sample_map_resolution"):
+                cworld.sample_map_resolution = 256

source/blender/blenkernel/BKE_blender.h

@@ -42,7 +42,7 @@ extern "C" {
  * and keep comment above the defines.
  * Use STRINGIFY() rather than defining with quotes */
 #define BLENDER_VERSION         276
-#define BLENDER_SUBVERSION      9
+#define BLENDER_SUBVERSION      10
 /* Several breakages with 270, e.g. constraint deg vs rad */
 #define BLENDER_MINVERSION      270
 #define BLENDER_MINSUBVERSION   6