Remove HACK annotation
Apparently there isn't a more efficient method.
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@ -20,7 +20,6 @@ Rotation = Transform TRotation
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||| Determine if a matrix represents a rotation.
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-- HACK: Replace with more efficient method
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export
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isRotation' : FieldCmp a => Matrix' n a -> Bool
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isRotation' mat = isOrthonormal' mat && det mat == 1
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