44 lines
947 B
C
44 lines
947 B
C
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#include <BH/Math.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 BH_PlaneFromPoints(const float *a,
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const float *b,
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const float *c,
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float *out)
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{
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float tmp1[3], tmp2[3];
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BH_Vec3fSub(b, a, tmp1);
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BH_Vec3fSub(c, a, tmp2);
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BH_Vec3fCross(tmp2, tmp1, tmp1);
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if (BH_Vec3fNormalEx(tmp1, tmp1) < EPSILON)
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return BH_ERROR;
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out[3] = BH_Vec3fDot(a, tmp1);
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memcpy(out, tmp1, sizeof(tmp1));
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return BH_OK;
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}
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float BH_PlaneDistance(const float *plane,
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const float *point)
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{
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return BH_Vec3fDot(plane, point) - plane[3];
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}
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void BH_PlaneClosestPoint(const float *plane,
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const float *point,
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float *out)
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{
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float tmp[3];
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BH_Vec3fScale(plane, BH_PlaneDistance(plane, point), tmp);
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BH_Vec3fSub(point, tmp, out);
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}
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