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Undercut fragments not falling in Dynamics simulation

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Hi:

I’m building a scene in which a collider hits a line of text fractured with the Voronoi Fracture object, making the text collapse into a pile of rubble.  Seems pretty straightforward.

As shown in this example:

http://marshall-arts.net/Support/Collisions_Demo.c4d.zip

I have a wide cube impacting the bottom half of the text, which breaks apart as expected.  What’s not expected is significant parts of the upper half of the text hang in midair.

I’ve found a couple of ways to mitigate this:

1. Change the shape in the Dynamics Body Tag on the fractured text from Automatic to Moving Mesh.  This isn’t totally intuitive since the mesh ISN’T moving.  There’s NO interaction if the tag is set to Static Mesh.

2.  If I increase the Steps per Frame from 5 to, like, 30 in the Project settings, everything WILL explode even if the shape is set to Automatic, but I don’t want this more intense explosion.

Could I get a little clarification as to what’s happening here?

Thanks.

Shawn Marshall
Marshall Arts Motion Graphics


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