Message-ID: From: Shawn Hargreaves To: djgpp AT delorie DOT com Subject: Re: Real-time lens flares w/ Allegro? Date: Wed, 29 Apr 1998 11:07:18 +0100 MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk root AT delorie DOT com (Demandred) writes: Really? That seems rather an unlikely email address :-) > Instead of putting lens flares along a light vector (which would look > supremely cool - hehe) I was actually thinking of blitting a single > flare centered over the light source. Actually, I hadn't heard of the > term 'light vector' until you mentioned it - I'm assuming (from the > lens flare filters in my graphics package) that it's just a vector > from the light source that passes through the center of the screen? Exactly. Each flare should be positioned some fixed percentage of the distance along this vector. For a light source at position lx, ly, the flare should be located at: x = lx*n + SCREEN_W/2*(1-n) y = ly*n + SCREEN_H/2*(1-n) If you draw four or five flares at different sizes and with various values of n (use odd fractions, including some negative values and/or greater than one), you can get some really nice effects as the flares move around to follow the lightsource. For the light itself, I would be inclined to use some other sort of graphic than the regular lensflares, but this is a matter of artistic preference. Another cool trick with sun-type lights is to flash the entire screen to white (palette fade) when the light is very close to the centre of the display. Shawn Hargreaves.