Returns non-nil iff vector-1 and vector-2 are pointing in the
same direction or opposite directions.
- arguments:
- vector-1 3D Vector
- vector-2 3D Vector
- keyword arguments:
- tolerance Number, Default Value: *zero-epsilon*
- directed? Boolean, Default Value: nil
- If :directed? is t, the function returns t if the vectors are both parallel and point in the same direction. The default is nil, meaning that the function will return t regardless of which way the vectors point, as long as they are parallel
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