VDB grids

[dronzero]

If I have a VDB grid that has an emissive portion, then set that grid to not be visible to camera, then the grid doesn't cast any light on other objects in the scene. I would assume like any other self illuminated object, light or object light material, then it should still be able to cast light when not visible to camera.

[maru]

In Corona, when something isn't visible to the camera, it's pretty much non-renderable, so it will not affect the scene in any way. Do I understand correctly that you would like to have a volume grid which is emissive (casts some light into the scene), but is not visible directly? Why exactly do you need that? What's the use case? I think this may not be possible, but maybe I could offer some workaround once I understand the specific scenario better.

[maru]

Sorry, I made a mistake in my previous message. When an object is invisible to a camera, it should still cast shadows, etc. But I am still interested in understanding better what your use case is.

[maru]

I cannot reproduce the original report. If I make a volume grid with emission invisible to camera, it still casts light into the scene.