How do I control which light materials work in the vray volume fog?

[JD3D_CGI]

You seem to have "use all lights" or I can choose which lights to include... but, how can I only choose objects that have a light material on?

Or how can I make it so that I exclude lights rather than include?

[hermit.crab]

how can I only choose objects that have a light material on?

You probably need a script for that. However, the Include list works with Lights only, so you probably need to use VRayMeshLights (or disable DI).

Or how can I make it so that I exclude lights rather than include?

Sorry to say, you can't do this at this point. I guess it's a good idea to implement it.

EDIT- This is for 3ds Max.

[JD3D_CGI]

I want it to me light material as I am using them to light up Tyflow particles.

But yeah, some improvements to this would be welcome!

[hermit.crab]

Well if you insist on it, disabling DI should suffice. Otherwise, you can use the VRayInstancer to instance Mesh Lights to a tyFlow particle system (you need to enable the Particle Interface in the Interfaces tab of the tyFlow node) and afterward disable the "Affect Atmosphere" of the VRayMeshLight.