Tiago Gusmão wrote:

Altough the billboard itself always faces the POV, you can still set the normal the way the real light would be pointing to, them set a diffuse light on the POV and enable backface culling.
I suppose performance hit should be minimal for TnL hardware.

The normal only affects lighting. Backface culling is done based on the "winding" of the triangle. You would still see the light from every direction.



Curtis Olson        http://www.flightgear.org/~curt
HumanFIRST Program  http://www.humanfirst.umn.edu/
FlightGear Project  http://www.flightgear.org
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