Thx to all - maybe i finally found a solution - without SIN/COS/Rotations, simply using TFormVector and Pos. of Camera...
If it works, i´ll soon post the triangle-billboard-function, along with some useful links/therory...
Screenshot (Athlon900, Win98SE, Particles NOT animated, just billboarding...):
If it works, i´ll soon post the triangle-billboard-function, along with some useful links/therory...
Screenshot (Athlon900, Win98SE, Particles NOT animated, just billboarding...):