Fixed 0 mod 90 rotation angle issues#36
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Issue arose due to floating point math when computing distances along nearly grid-aligned scan vectors (i.e. angle of rotation relative to nominal 0º was 0 mod 90). Fixed by asserting minimal vector component size at initialization.
Also fixed issue with no tolerance when checking SDF.
may be a cleaner way to do this other than np.where, but seemed the most pythonic.