first commit

CS4451/proj5/utils.h

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+#ifndef _UTILS_H_
+#define _UTILS_H_
+
+#include <GL/glut.h>
+#include <math.h>
+
+#include "structs.h"
+
+inline void cross(Vector& dest, Point& a, Point& b) {
+    dest.i = ( (a.y*b.z) - (a.z*b.y) ); //i
+    dest.j = ( (a.z*b.x) - (a.x*b.z) ); //j
+    dest.k = ( (a.x*b.y) - (a.y*b.x) ); //k
+}
+
+inline void cross(Point& dest, Point& a, Point& b) {
+    dest.x = ( (a.y*b.z) - (a.z*b.y) ); //i
+    dest.y = ( (a.z*b.x) - (a.x*b.z) ); //j
+    dest.z = ( (a.x*b.y) - (a.y*b.x) ); //k
+}
+
+
+inline GLfloat dot(Vector &a, Vector &b) {
+    return (a.i*b.i)+(a.j*b.j)+(a.k*b.k);
+}
+
+inline GLfloat dot(Point &a, Point &b) {
+    return (a.x*b.x)+(a.y*b.y)+(a.z*b.z);
+}
+
+#endif