Comment=From Jeremie Allard (http://hufo.planet-d.net/codefr_us.php): "This little smoke effect is coded with a little particle system done for 'The OpenGL Challenge'." Specify colors using hex color codes (ie, ff0000, 00ff00, 0000ff for red, green and blue.) Ported to Linux by Tugrul Galatali - <http://rss-glx.sourceforge.net/>.