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Why does this 3D ball roll through the floor?

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Paul SundsoeyWhy does this 3D ball roll through the floor?
by on Apr 9, 2012 at 2:57:17 pm

I am quite new to importing 3D objects into After Effects. I have now imported a football object (originally made in 3DS max and made a PSD in photoshop).

I have made a simple animation where the football rolls on a floor and casting a shadow on it. The problem is that it rolls through the floor, even though I am only adjusting the position on the z-axis (and rotates the ball). Can anyone explain me what I have to do?
I will greatly appreciate any comments on this!

ps. the z-position can be adjusted by the controller layer.

Here is the file:



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