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Improving Spring SOP Collision

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...using the Spring SOP (Thanks, Sirogi! ;) ) to make pigtails that bounce on a hyperactive model.

BUT

The occasional pigtail is sliding through the model's face (disappearing at the nose, reappearing at the chin) for a truly frightening effect.

I can't delete individual 'problem' strands because too many of them fail once (though they bounce properly 90% of the time).

any ideas?

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approximate the model's geometry with metaballs; pipe it through a Force SOP (with radial force at a minus value); and into the Spring SOP.

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Try increasing the Time Increment (Time Inc) parameter from 1/$FPS to 0.1/$FPS. This parameter determines how may times the spring SOP evaluates per frame. 1/$FPS evaluates on frames where 0.1/$FPS evaluates 10 times a frame.

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Is the collision geometry triangles? Houdini doesn't like to perform collisions on quads or others because of the possibility that some polys might be non-planar. So, if your collision geomentry isn't triangulated, you might try triangulating it with a divide SOP.

stu

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