vray light material and opacity

[vance3d]

it seems like the vray light material only respects the opacity map for the alpha channel. the rgb portion of the render still renders the entire object it is applied to. In addition to that the opacity map appears inverted in reflections.

V Miller

[vlado]

it seems like the vray light material only respects the opacity map for the alpha channel

This is correct, yes. In this way, you can create perfectly transparent surfaces which still emit light, which would not have been possible otherwise.

In addition to that the opacity map appears inverted in reflections

Do you have an image for this? The light material derives its transparency from the RGB channel of the opacity texture, and not from its alpha value, if this is what you have observed.

Best regards,
Vlado

[vance3d]

but in my experience if I use a radial grad white in the middle and black on the edges is used as an opacity map, the plane that the material is applied to still renders in full. it is not clipped at all by the opacity map. how are you supposed to make a transparent object that ommits light if this is how its supposed to work.

V Miller

[vance3d]

on the right side is a plane mapped with a radial gradient that goes from red to black and the opacity channel has the same pattern but white to black

on the left side is a plane with the same opacity map as the right but just uses the color chip set to red. the map channel is empty.

I expected the opacity map to clip the plane on the left like it does on the right but it does not.

I was doing some tests with the vray light material being used for reflection cards, not as actual light sources.

I am using the universal rendering settings vray version rc 1.53

I could not repeat the reflection bug that I mentioned above





V Miller