teaching machines

Reaction Ball

A couple of summers ago, we picked up a SKLZ Reaction Ball at a local sporting goods store:

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It bounces in funny ways to help you train your hand-eye coordination.

We decided to make our own using the new mesh intersection operator in Madeup. A reaction ball is the union of one big sphere and six smaller ones along the cardinal axes. Thanks to libigl, I didn’t have to do any cleanup of the result before we printed it:


It doesn’t bounce like the original, but it gets its reaction when you turn off the lights:



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