Fix rotation change detection in integrator #284
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Jondolf
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C-Bug
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Objective
In #272, the integrator was changed to update rotation only if
delta.w != 0.0. However, in some cases, x, y, or z can be non-zero even if w is zero, like withAngularVelocity(Vec3::X), and in those cases the rotation would incorrectly be ignored.Solution
Make the condition stricter by also checking if x, y, and z are 0. Based on a quick test, this should also keep change detection working, which is what #272 was trying to address.