Cycles / Sampling Presets:

* Add Presets for Sampling. This comes with a simple Preview and Final preset, but as this is varying a lot depending on the scene, they should just be a starting point. The user can add own presets here.

* Some UI layout changes to match the settings a bit better.

release/scripts/presets/cycles/sampling/final.py

@@ -0,0 +1,16 @@
+import bpy
+cycles = bpy.context.scene.cycles
+
+cycles.squared_samples = True
+
+cycles.samples = 8
+cycles.preview_samples = 8
+cycles.aa_samples = 8
+cycles.preview_aa_samples = 8
+
+cycles.diffuse_samples = 3
+cycles.glossy_samples = 2
+cycles.transmission_samples = 2
+cycles.ao_samples = 1
+cycles.mesh_light_samples = 2
+cycles.subsurface_samples = 2

release/scripts/presets/cycles/sampling/preview.py

@@ -0,0 +1,16 @@
+import bpy
+cycles = bpy.context.scene.cycles
+
+cycles.squared_samples = True
+
+cycles.samples = 4
+cycles.preview_samples = 4
+cycles.aa_samples = 4
+cycles.preview_aa_samples = 4
+
+cycles.diffuse_samples = 3
+cycles.glossy_samples = 2
+cycles.transmission_samples = 2
+cycles.ao_samples = 1
+cycles.mesh_light_samples = 2
+cycles.subsurface_samples = 2