Great point sprites

Hello, I''m using a point sprite to render sunbursts/lensflare effects. It works fine, thus there''s a last problem. When the lensflare''s center is out of the screen, the sprite disappears before being completly out of the screen. I don''t know exactly what''s going on, but I suppose this is because using size_min, I force a size wider than the maximum size possible : the point sprite has to be quite big (500 pixels and even more). Does anyone can help me? Thanks. -- Zavie