Initial commit

Plane.c

@@ -0,0 +1,32 @@
+#include "CgeMath.h"
+#include <string.h>
+
+#define EPSILON 0.00001f
+#define PI      3.14159265358979323846f
+
+int CgePlaneFromPoints(const float a[3], const float b[3], const float c[3],
+                       float out[4]) {
+    float tmp1[3], tmp2[3];
+
+    CgeVec3fSub(b, a, tmp1);
+    CgeVec3fSub(c, a, tmp2);
+    CgeVec3fCross(tmp2, tmp1, tmp1);
+    if (CgeVec3fNormalEx(tmp1, tmp1) < EPSILON)
+        return 0;
+
+    out[3] = CgeVec3fDot(a, tmp1);
+    memcpy(out, tmp1, sizeof(tmp1));
+    return 1;
+}
+
+float CgePlaneDistance(const float plane[4], const float point[3]) {
+    return CgeVec3fDot(plane, point) - plane[3];
+}
+
+void CgePlaneClosestPoint(const float plane[4], const float point[3],
+                          float out[3]) {
+    float tmp[3];
+
+    CgeVec3fScale(plane, CgePlaneDistance(plane, point), tmp);
+    CgeVec3fSub(point, tmp, out);
+}