I will be using three different passes for the final composite.

These are (1)”the ambient color pass” for main diffuse rendering, (2)”the ambient occlusion pass” to attenuate the diffuse pass and (3)”the specular pass” to control the highlights seperately.

The Ambient Color Pass:

The ambient color pass is the flat lit diffuse rendering pass only illuminated by the scene ambient light.

To render the ambient color pass the first thing we need to do is to turn off all the scene lights from each of the light’s general parameters rollout. In addition to that Advanced Lighting should be turned off as we are trying to simulate GI without it. You could do this from the Render Scene Dialog(Default Hotkey: F10) or from the Rendering pulldown menu.

The last step is to turn up the ambient color which is on the Environment Panel of the Environment and Effects dialog (Default Hotkey:8) The ambient color with a Value(HSV) of 140 would do fine to reveal the object clearly in the rendering.

The pass takes only 51 seconds to render including raytracing. Here’s what it looks like: