For materials using AO pass, this makes the material preview and the GLSL preview more accurate, but shouldn't affect final rendering in most cases because we usually enable AO when using the AO pass in node tree. Thanks to Brecht for code review.
For materials using AO pass, this makes the material preview and the GLSL preview more accurate, but shouldn't affect final rendering in most cases because we usually enable AO when using the AO pass in node tree. Thanks to Brecht for code review.