Unneeded Setup/Prepasses?

[Lehm_2001]

On occation I will do test renders and turn certain things off. But V-ray still seems to do setup for certain things. For example. If you have interpolation reflective/refractive on a material and then override materials...it will still do the interpolative prepasses for it. Also if you set brute force/bruce force with interplated materials it will still do the irradiance prepasses...shouldn't it skip past those and just do reflective/refractive prepasses? Same thing for lights with shadow maps. Turn off lights in the settings, still sets up shadow map. Also if you turn glossy effects off...do the material prepasses need to be done?

Thanks.

[jonahhawk]

bump.

We just went through the same problem. We were doing a matte pass, rendering only the displaced grass in our scene with BF/BF.

We have an override material on everything excluding the grass. Some of the materials use interpolation, both in the actual scene as well as in some XRefs. The override blankets all of the objects properly. But VRay still runs the interpolation pass and kills the render time and the RAM goes through the roof.

When we turn off the interpolation in the scene mats and in all of the xrefs, it fixes the issue. Of course, it also works to simply turn off reflection/refraction in the global settings.
Does anyone have an explanation for why the override does not eliminate the interpolation pass(es)?