Fuzz on 3D rotate after using index-1 expression

Question

I'm creating an animation of a rotating diamond following this tutorial: https://www.youtube.com/watch?v=Rp5kvSCaeOU

I have the diamond as a component, and then used the index-1 expression on the Z Position. Duplicated the diamond to get the thickness and parented them to a null. When I rotate the null there is a weird feathery look when it rotates at a certain angle. I have tried clearing cache and preview options. I'm at a loss, any assistance would be appreciated.

Mylenium · Answer

Nothing wrong here. It's how AE's old standard 3D renderer works. At certain angles you get undersampling where to many samples end up showing the wrong values. It's a precision issue and you can do nothing about it. If you need a more solid appearance, you have to use a genuine extrusion with the Cinema 4D renderer. Other than that it's usually not much of a problem, as motion blur and so on will disguise these artifacts further and of course you should only use fast and short moves with this fake technique, anyway.

Mylenium

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