Unity Math

Math3D.cs

static class Math3D
    {
        private static System.Random rand = new System.Random();

        public static float DistanceToLine(Ray ray, Vector3 point)
        {
            //see:http://answers.unity3d.com/questions/62644/distance-between-a-ray-and-a-point.html
            return Vector3.Cross(ray.direction, point - ray.origin).magnitude;
        }

        public static Vector3 ClosestPointInLine(Ray ray, Vector3 point)
        {
            return ray.origin + ray.direction * Vector3.Dot(ray.direction, point - ray.origin);
        }

        public static Vector3 toGround(Vector3 inVector)
        {
            var outVector = inVector;
            outVector.y = 0;
            return outVector;
        }

        public static float CWAngle(Vector2 from, Vector2 to)
        {
            float output = Vector2.Angle(from, to);

            if (Vector3.Cross(from, to).z < 0)
                output = 360f - output;

            return output;
        }

        public static float newRandomNumber(float min, float max)
        {
            return (min + (float)rand.NextDouble() * (max - min));
        }

    }