Ok...
But why does c_updatehull also create a cube-shaped collision hull and not a cross-shaped like my model looks like?

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EDIT: http://manual.conitec.net/ac_setminmax.htm

Quote:

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If possible, call c_setminmax(my) instead of c_updatehull(my,1) - both give the same result, but c_setminmax will be much faster.

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The manual says that both give the same result