Diff: vector.cpp

Revision:

0:456611adedf8

Child:

3:a55edecc96e2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vector.cpp	Sat Oct 31 16:14:13 2015 +0000
@@ -0,0 +1,47 @@
+#include <vector.h>
+#include <math.h>
+
+void vector_cross(const vector *a,const vector *b, vector *out)
+{
+  out->x = a->y*b->z - a->z*b->y;
+  out->y = a->z*b->x - a->x*b->z;
+  out->z = a->x*b->y - a->y*b->x;
+}
+
+float vector_dot(const vector *a,const vector *b)
+{
+  return a->x*b->x+a->y*b->y+a->z*b->z;
+}
+
+void vector_normalize(vector *a)
+{
+  float mag = sqrt(vector_dot(a,a));
+  a->x /= mag;
+  a->y /= mag;
+  a->z /= mag;
+}
+
+void vector_norm_xz(vector*a)
+{
+ float mag = sqrt(a->x*a->x + a->z*a->z);
+ a->x /= mag;
+ a->y  = 0;
+ a->z /= mag;
+ 
+}
+
+void vector_norm_xy(vector*a)
+{
+ float mag = sqrt(a->x*a->x + a->y*a->y);
+ a->x /= mag;
+ a->y /= mag;
+ a->z  = 0;
+} 
+
+void vector_norm_yz(vector*a)
+{
+ float mag = sqrt(a->z*a->z + a->y*a->y);
+ a->x  = 0;
+ a->y /= mag;
+ a->z /= mag;
+}   
\ No newline at end of file