33 lines
855 B
C
33 lines
855 B
C
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#include "CgeMath.h"
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#include <string.h>
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#define EPSILON 0.00001f
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#define PI 3.14159265358979323846f
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int CgePlaneFromPoints(const float a[3], const float b[3], const float c[3],
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float out[4]) {
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float tmp1[3], tmp2[3];
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CgeVec3fSub(b, a, tmp1);
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CgeVec3fSub(c, a, tmp2);
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CgeVec3fCross(tmp2, tmp1, tmp1);
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if (CgeVec3fNormalEx(tmp1, tmp1) < EPSILON)
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return 0;
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out[3] = CgeVec3fDot(a, tmp1);
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memcpy(out, tmp1, sizeof(tmp1));
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return 1;
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}
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float CgePlaneDistance(const float plane[4], const float point[3]) {
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return CgeVec3fDot(plane, point) - plane[3];
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}
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void CgePlaneClosestPoint(const float plane[4], const float point[3],
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float out[3]) {
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float tmp[3];
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CgeVec3fScale(plane, CgePlaneDistance(plane, point), tmp);
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CgeVec3fSub(point, tmp, out);
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}
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