full xyz rotations #195
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full xyz rotations #195
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support full rotations on the xy, xz and yz planes.
rotations, like locations, are with respect to the parent. introduce
get_absolute_rotation.origin is fixed wrt the resource, which is also the origin of rotation. (before we updated the resource's origin after the rotation to be the lfb always & we re-located the direct children. this was all silly)
implement two simple lin alg functions matrix_multiply_3x3, matrix_vector_multiply_3x3 to avoid numpy dependency.