Glossy rays behind transparent objects.

[Robert]

My scene got a lot of glass and metal surfaces. So, I have both reflection depth and glossy reflection. Just to start with an example: When I render the scene with reflection depth of 1 for all glossy surface the rendertime is 20 minutes. When I want to see the metal surface behind the glass I need to increase the reflection depth of glossy surfaces to at least 3 or more. With a Depth of 3 the rendertime is 2 hours 40 minutes. Yeap that's the problem.

So, I would like to see a feature in vray that can deal with this problem. Glossy Reflection can be set to a depth of 1 nearly in all cases, but then transparent objects need to recognize these and deal with it. Sound not to hard?

Maybe increase reflection depth behind a transparent object automatically or simple render what is behind.

best regards,

robert

[duke2]

Why can't you deal with this on a per-material basis? Use the VRay Material Control script to set all refl and refr max depths to 1 and tweak upwards from there till the render is unbroken.

[Robert]

well increase rays is one thing, but that is not my problem. my problem is that glossy rays are totaly ok with a depth of 1. But whenever a transparent object is bevor a close one I need to increase the depth to 2 or 3 (singleside, doublesided) and not only for the aera behind the transparent object, but for all areas with that material. This cause a lot higher render time.
So, let's say you have a room with lot of glossy materials and 2-3 Glas walls... that make rendering the scene a pure horror!

[MoonDoggie]

How much a difference in render times are you talking? Because even a pretty big hit might be completely acceptable considering the circumstances in lots of glossies. Whenever you have glossy surfaces you are going to increase render times, whenever your max depth goes up, you are going to increase render time. Maybe a still with render times posted would help more because right now, it sounds like you're fine.