28 lines
802 B
C
28 lines
802 B
C
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#include "CgeMath.h"
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float CgeLerpf(float a, float b, float t) {
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return a + (b - a) * t;
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}
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void CgeTriangle3fBarycentric(const float a[3], const float b[3],
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const float c[3], const float point[3],
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float out[3]) {
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float tmp1[3], tmp2[3], tmp3[3];
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float t11, t12, t22, t31, t32, denom;
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CgeVec3fSub(b, a, tmp1);
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CgeVec3fSub(c, a, tmp2);
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CgeVec3fSub(point, a, tmp3);
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t11 = CgeVec3fDot(tmp1, tmp1);
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t12 = CgeVec3fDot(tmp1, tmp2);
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t22 = CgeVec3fDot(tmp2, tmp2);
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t31 = CgeVec3fDot(tmp3, tmp1);
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t32 = CgeVec3fDot(tmp3, tmp2);
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denom = 1.0f / (t11 * t22 - t12 * t12);
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out[1] = (t22 * t31 - t12 * t32) * denom;
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out[2] = (t11 * t32 - t12 * t31) * denom;
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out[0] = 1.0f - out[1] - out[2];
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}
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