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Mad Alex

OpenGL Need help with stencil shadows [56K beware]

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Hi gamedev.net, this is my first post here, but I don't really want to give a lengthy intruduction and skip ahead to my problem: (z-fail) stencil shadows. For some days I have tried to get them working with limited success. I really don't see what's wrong with it anymore (maybe I should give it some rest and come back to it later, but I'm impatient :)). So, here are some screenshots: Camera behind the light source. Shadow volume and scene, edges in blue. Shadow volume only, edges in blue. Scene with "phantom" shadow and weird edges on the cubes (z-test is on). The scene above with shadow volume / edges. Close-up of edge-problem. Stencil buffer. Please note that I had to photoshop the image to visualize it. The raw image had a value of 1 at most pixels, but some of them where 255 (can this be correct?). Oh: I do cap the front and back sides of the shadow volume, both caps and the rest of the hull facing outside the volume. From what I can tell there are no holes in it. I'm not extruding it to infinity (yet). I use OpenGL if this is important. Please ask if you have any questions. I can provide code, more images, stencil buffer dumps or even a video where I fly around the scene. Thank you for your help!

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