Lets say, a very simple scene:
Grid for the floor (just mid grey)
Sphere - slightly reflective, phong (doesn’t matter I guess)
Cylinder in front of the sphere - Glass material (arch mat), with some colour.
(wonderful eh !)
Light is coming from 1 point light (sunlight for ex), and ambience from HDR - essentially doesn’t really matter about that, as I guess the process will be the same for any system.
(not using FG/GI but AO for enviro)
Obviously I’m breaking my scene up into render passes for compositing later on.
The ‘beauty’ pass should show that the shadow from the glass is slightly coloured and not a coloured block.
So for the shadow pass - how do I set this up ?
I presume some kind of matte shading trickery or something.
Because what tends to happen is the shadow ends up just being a block of white, as it doesn’t seem to get information from the glass material, just the outline of the object.