Vray 2.4 Caustics

[mrichter16]

I've been having some issues with rendering caustics today, something which I haven't had problems with in the past... so I figured it might be an issue with Vray 2.4 as I've not tried caustics since the update.

 

A quick google search helped me to fix the first problem, which was solved by needing to uncheck 'affect shadows' in the material refraction settings... I'm not sure why this changed in Vray 2.4, it seems affect shadows ought to be checked, but I guess when caustics is on this overrides this somehow and calculates light / shadows / caustics accurately.

 

I then went on to discover that Vray 2.4 doesn't seem to like rendering caustics from spot or omni lights (unless I'm doing something wrong) which is very annoying. It works fine with direct and vray lights. I can see that omni and spot lights are both 'unreal' lights, so perhaps vray have changed how they calculate caustics completely and spot and omni lights no longer work properly?

 

I've attached 3 images, one rendered with a vray sphere light, one with a direct, one with an omni and one with spot.

 

If anyone can 'shed some light' (eugh!) on this it'd be much appreciated. For now I think I'll just use vray lights, but it was nice being able to 'fake' caustics and render them much faster with a strategically placed spot light.