Add support for instanced lights

[Dan Andersen]

We're currently doing last-moment de-instancing of all lights in scenes before passing on to rendering, but it would be much better to just have instanced lights working out of the box.

Pixar added support for rendering instanced lights in Hydra in USD 23.08 (= the build that ships with Houdini 20.0). From what I understand, render delegates need to evaluate instancing attributes on the light prototypes for this to work.

Is this something VRay could support?

[bdancer]

> Pixar added support for rendering instanced lights in Hydra in USD 23.08
> Is this something VRay could support?

This is already implemented in most latest nightlies.

[Dan Andersen]

Brilliant, I'll try and get my hands on a fresh build to test out!

[bdancer]

Attaching simple scene with color / intensity variations just in case.

[Dan Andersen]

Works great - thank you