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Expanding Footprints


marcosimonvfx

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Hi.

 

In the project I'm doing a character is running across a plane. Every time his feet touch the ground they want a "ring" in the shape of his foot outline expanding out from the point of contact (can be rendered as a texture override, no need for geometry). The ring shall eventually fade but stay in the form of the foot all his lifetime (except the size, that is expanding).

 

I've tried various ways, the most promising was to transfer attributes (color) from the foot to the groundplane with a solver and then (with the same solver) use those points to again transfer attributes to the same groundplane geometry itself so that it expands for every frame.

 

The problem is that the result is always a solid (filled) shape, not a ring. Also the shape of the foot soon gets lost to become a rectangle with rounded corners. Is there a better way to do it?

 

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