hairball screen

[dosdemo] / src / vmath.h

diff --git a/src/vmath.h b/src/vmath.h
index 3cdbedf..463fea6 100644 (file)
--- a/src/vmath.h
+++ b/src/vmath.h
@@ -141,4 +141,22 @@ static INLINE void mat4_transpose(float *mat)
        }
 }
 
+/* misc stuff */
+static vec3_t INLINE sphrand(float rad)
+{
+       vec3_t res;
+
+       float u = (float)rand() / RAND_MAX;
+       float v = (float)rand() / RAND_MAX;
+
+       float theta = 2.0f * M_PI * u;
+       float phi = acos(2.0f * v - 1.0f);
+
+       res.x = rad * cos(theta) * sin(phi);
+       res.y = rad * sin(theta) * sin(phi);
+       res.z = rad * cos(phi);
+
+       return res;
+}
+
 #endif /* VMATH_H_ */