add new random vector fct

sweet_math.c

@@ -525,6 +525,38 @@ vec3_angle (vec3 a, vec3 b)
     return acos (dot);
 }
 
+vec2 
+vec2_positive_random ()
+{
+    vec2 v;
+    v.x = (float)rand() / (float)RAND_MAX;
+    v.y = (float)rand() / (float)RAND_MAX;
+    return vec2_normalize (v);
+}
+
+vec3 
+vec3_positive_random ()
+{
+    vec3 v;
+    v.x = (float)rand() / (float)RAND_MAX;
+    v.y = (float)rand() / (float)RAND_MAX;
+    v.z = (float)rand() / (float)RAND_MAX;
+
+    return vec3_normalize (v);
+}
+
+vec4 
+vec4_positive_random ()
+{
+    vec4 v;
+    v.x = (float)rand() / (float)RAND_MAX;
+    v.y = (float)rand() / (float)RAND_MAX;
+    v.z = (float)rand() / (float)RAND_MAX;
+    v.w = (float)rand() / (float)RAND_MAX;
+
+    return vec4_normalize (v);
+}
+
 vec2 
 vec2_random ()
 {

sweet_math.h

@@ -188,7 +188,13 @@ float vec2_angle (vec2 vector1, vec2 vector2);
 float vec3_angle (vec3 vector1, vec3 vector2);
 
 /** Random */
+vec2 vec2_positive_random ();
+vec3 vec3_positive_random ();
+vec4 vec4_positive_random ();
+
+vec2 vec2_random ();
 vec3 vec3_random ();
+vec4 vec4_random ();
 vec3 vec3_random_ortho (vec3 v);
 
 /** Mult */