Justin Marshall
19 lines
693 B
C++
19 lines
693 B
C++
#include "sphere.h"
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bool idSphere::LineIntersection(const idVec3& start, const idVec3& end) const {
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const idVec3 fromCenter = start - origin;
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const idVec3 direction = end - start;
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const float projection = -fromCenter.Dot(direction);
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if (projection <= 0.0f) return fromCenter.LengthSqr() < radius * radius;
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const float directionLengthSqr = direction.LengthSqr();
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if (projection >= directionLengthSqr) {
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const idVec3 endFromCenter = end - origin;
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return endFromCenter.LengthSqr() < radius * radius;
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}
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const idVec3 closest = fromCenter
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+ direction * (projection / directionLengthSqr);
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return closest.LengthSqr() < radius * radius;
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}
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