Hi all, recurrent problem setting shadow pass. I'm breaking my scene into different render setup layers (characters, background, shadows, etc). In the shadow pass I only need characters shadows over background, so:
.- Character geos with CHAR in Trace Sets property (shapes). The Sphere in this case.
.- Background geos with SET in Trace Sets property (shapes). The planes in this case.
.- Shadow matte shader --> TraceSet --> raySwitch assigned to background objects (same network as scene in manual https://docs.arnoldrenderer.com/display/A5AFMUG/Trace+Set).
.- Trace Set node in above network, CHAR inclusive ( to avoid shadow rays from SET geometries). Inverting values (SET exclusive) throws same result.
The result shown is shadow AOV.
In the caption, the shadow marked with "V" is the searched result, shadow from ball (CHAR).
The "Shadow" marked with "X", I dont know what it is, because its not the shadow from top plane into down plane. I SUPPOSE it's the ball shadow projected onto down plane, but ... all planes cast shadows, so I SUPPOSE that's a collateral effect from Trace Set shader.
The big question is, can we stop the shadow marked with "X" to not appear?
Yes, I know that in this scene is easy but, in production scenes where are hundreds of objects and lights, can we setup globally the scene without working objects one by one?
Thanks in advance !!!