i made a quick attempt to fix a known particle rendering bug. particles were rotated when the camera was moved with the middle mouse button. http://cvs.savannah.gnu.org/viewvc/fluxus/libfluxus/src/ParticlePrimitive.cpp?root=fluxus&r1=1.16&r2=1.17 it seems to work now, but i'm not sure if it's right. please test it. best, gabor