Render Layer With Matting

[caustics77]

Hey All,

I'm trying to render an object that had improper textures in my first pass. This part intersects with other geometry and I would like to get it out alone as the entire render takes a while.

In an alternate scenario to do this I'd add a surface shader to all the other pieces set it to black, and then render the object as normal.

I'm doing this same concept with a VRay Light MTL set to black as well as the color multiplier set to 0. Unfortunately nothing renders but the black-ed out part and not the geometry, has anyone experienced this before?

I have been re-rendering scenes as full because I can't seem to get this to work.

Thank You

-Patrick

[Morbid Angel]

Hmm, well vray works with surface shader just the same.

But, this is not what you need to do. The absolute correct way is to make 2 vray object properties sets for your objects - 1 (new object to be rendered), - 2 (other objects).

For the beauty layer of the object 1, you need to set the objects 2 as prime vis off (so they cast shadows and are visible to reflection if your obj 1 is reflective)

For the matte layer, you need to render object 1 as green and objects 2 as red.

In comp you can use the green as object 1's beauty alpha and key that in over the improper object.

Alternatively you can use object's 2 set and check matte/ alpha contribution -1 and the other objects will cutout obj 1 and it will render correctly, however I am concerned that you may get an edge where they overlay. So method described above is better for that.