Vector reflect - отражения

struct vector3 {
	float x,y,z;
};

int main (void)
{
	vector3 vIn = { 1.0, -1.0, 0.0 };
	vector3 vNorm = { 0.0, 1.0, 0.0 };

	vector3 vOut;

	float s = 2.0f * ( vIn.x * vNorm.x + vIn.y * vNorm.y + vIn.z * vNorm.z );

	vOut.x = vIn.x - s * vNorm.x;
	vOut.y = vIn.y - s * vNorm.y;
	vOut.z = vIn.z - s * vNorm.z;

	return 0;
}