Rims is right, I had this effect in my engine for all lights, but dropped it since it is way to slow.
You can use it for a hand full off unique effects such as the sun etc. But I don't recommend to use it for a high (>5)number of lights.
You can use it for a hand full off unique effects such as the sun etc. But I don't recommend to use it for a high (>5)number of lights.