implemented CVector2D::NormaliseSafe for SkidMarks

src/math/math.cpp

@@ -4,6 +4,19 @@
 
 // TODO: move more stuff into here
 
+void
+CVector2D::Normalise(void)
+{
+	float sq = MagnitudeSqr();
+	assert(sq != 0.0f);	// just be safe here
+	//if(sq > 0.0f){
+		float invsqrt = RecipSqrt(sq);
+		x *= invsqrt;
+		y *= invsqrt;
+	//}else
+	//	x = 1.0f;
+}
+
 void
 CMatrix::SetRotate(float xAngle, float yAngle, float zAngle)
 {