Sack Library Documentation
sack::math::vector::Near Macro
#define Near( a, b ) ( COMPARE(a[0],b[0]) && COMPARE( a[1], b[1] ) && COMPARE( a[2], b[2] ) )

compares two vectors to see if they are near each other. Boundary conditions exist around 0, when the values are on opposite sides, but it's pretty good.

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