VRay for SketchUp New Features Guide
Ambient Occlusion (AO):
This shading method will add more realism to your render and can produce the
feeling of a more detailed image. Find the global option of AO under "Indirect
On: This option enables or disables Ambient Occlusion.
Radius: Determines the amount of area where the AO effect is produced.
Subdivs: Determines the quality of Ambient Occlusion. Large values mean
better quality, but might increase the render time.
Amount: The amount of Ambient Occlusion. Larger numbers mean more Ambient
This image has no AO. Note how the details on the door and windows are missing.
This image has AO. All of the details are visible even with a very low quality
Here is another example of Ambient Occlusion. In the image directly below,
without AO, the render looks flat and some details in the ceiling are missing.
The next image has AO, and the details are sharp.
Ambient Occlusion Off
Ambient Occlusion On
V-Ray for SketchUp doesn’t have an AO channel, so there is no
automatic way to create an AO pass. If you want to create an AO pass
for post-processing purposes, use an override material and select a
white color, then enable AO. On the environment, don’t use any
mapping for GI color and BG color (use just plain white as a color).