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3d masking when in different planes

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Gareth Little
3d masking when in different planes
on Jan 14, 2020 at 1:17:44 am

I've hit a bit of a wall in trying to work this out myself. I have a simple 3d scene of a character sat behind a desk. The desk top is at 90° to the character. There are two effects I'd like to achieve in this scene. I've had limited success on individual static shots, but I have several camera angle changes and the whole thing falls apart scene by scene.

I'd like to have the character reflected on the desktop.
The characters arms (separate layer) should show above the desk

When it was 2d, there were no problems, but I'm not sure how to have the arms (at 0°) show through the desk (at 90°), specifically the bottom of the arms sometimes go below the level of the desk.

As for the reflection, the tracking mattes don't seem to have the desired effect, I'm guessing because the character copy is again 90° to the table. Is this setup just a recipe for disaster? I put the reflection onto the same plane as the table but that reflection looks unnatural, it should go straight down instead of jutting out with the table. Here is a drawing of the scene from the side, front and 3d. I trying to have the red arms always show above the black table and the blue reflection be masked at the boundaries of the table.



I'd greatly appreciate any pointers anyone can give me,

Gareth


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