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Find intersection point for two vectors with start points p1, p2 and normalized directions dir1, dir2.
p1
p2
dir1
dir2
Vector!(float,2) intersectVectors ( Vector!(float,2) p1, Vector!(float,2) dir1, Vector!(float,2) p2, Vector!(float,2) dir2 ) nothrow @safe;
Returns p1 if vectors are parallel.