nearly finished init stuff (probs with rand function!)

[physik/posic.git] / math / math.c

diff --git a/math/math.c b/math/math.c
index 6d707e9..9cfaff6 100644 (file)
--- a/math/math.c
+++ b/math/math.c
@@ -7,6 +7,8 @@
 
 
 #include <string.h>
+#include <math.h>
+
 #include "math.h"
 
 int v3_add(t_3dvec *sum,t_3dvec *a,t_3dvec *b) {
@@ -64,3 +66,13 @@ int v3_cmp(t_3dvec *a,t_3dvec *b) {
        return(memcmp(a,b,sizeof(t_3dvec)));
 }
 
+double v3_absolute_square(t_3dvec *a) {
+
+       return(a->x*a->x+a->y*a->y+a->z*a->z);
+}
+
+double v3_norm(t_3dvec *a) {
+
+       return(sqrt(v3_absolute_square(a)));
+}
+