hi there i''ve set my background to white and now, when enabling GL_BLEND, all my objects disappear (blending looked really good with the black background, so i don''t really wanna change my alpha values...). do i have to use another blending function? can you recommend me a good one for this situation? thanks in advance simon

Post some relevant code first, and I might be able to help...

Most blending are additive line GL_ONE,GL_ONE.
try another one.