(Fixed) [HOU-3503] VRayLight option for projecting texture with a spotlight

[bumba]

Hi,
I am trying to emulate the lighting characteristics of the caustic reflections of a disco ball.
For this I want to project a texture through a spotlight. (The last time I have done this is 16 years ago ... maya software rendering)
But the vray spot light does no have a texture slot as the vray light rectangle has.
I can project a texture through an vray light rectangle and set the directionality to 1 to get it sharp. But it does not have the characteristic of a spot light.
I also tried to make the size of the are light as small as I could, and to reduce the directionality to 0.5 ish. But this results in a very noisy and still not sharp light pattern.


Help is apreciated
Cheers
Christian

[chakarov]

Sorry for late reply, you could use "Emission Color" in Textures group of SpotLight UI.

[bumba]

THX for the Reply Chakarov. I tried it, but the projected image repeats. I do not seem to have control over the "uv space" of the projecting spotlight.

[chakarov]

The texture should be loaded in mat network as V-Ray ImageFile VOP, and than the path to this vop should be provided to spotlight "Emission Color". This way you will have all the texture controls available in V-Ray ImageFile.

[bumba]

Yes, that totally works. Thanks Chakarov !!!

[the_one_j]

Hi, im having an issue instancing spotlights that have emission color, like a gradient map plugged in. As soon as i instance this spotlight onto points using s@instance attribute, the lights dont show up anymore in render.
https://www.dropbox.com/t/W5giCKu5lGKWhkMw

link above is simple hip file of the problem. working on live job that needs this working, so appreciate any help anyone has.


cheers
J
Atomic14

[Gosho.Genchev]

Hey the_one_j ,

We've added support for the Emission color texture on instanced lights with the nightly builds from Nov 10, 2022.

Best regards!