Cycles: fix sampling issue with certain (transparent) max bounce settings, and

tweak presets/defaults to use 128 instead of 1024.

release/scripts/presets/cycles/integrator/full_global_illumination.py

@@ -1,11 +1,11 @@
 import bpy
 cycles = bpy.context.scene.cycles
 
-cycles.max_bounces = 1024
+cycles.max_bounces = 128
 cycles.min_bounces = 3
 cycles.no_caustics = False
-cycles.diffuse_bounces = 1024
-cycles.glossy_bounces = 1024
-cycles.transmission_bounces = 1024
+cycles.diffuse_bounces = 128
+cycles.glossy_bounces = 128
+cycles.transmission_bounces = 128
 cycles.transparent_min_bounces = 8
-cycles.transparent_max_bounces = 1024
+cycles.transparent_max_bounces = 128