RE: [Algorithms] Yet another stencil shadow question
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From: Guillaume P. <Gui...@ps...> - 2002-12-20 22:47:13
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Bernie, This is not a flaming thread; please be respectful in your 'naming conventions'. Guillaume. -----Original Message----- From: gda...@li... [mailto:gda...@li...]On Behalf Of Bernie Freidin Sent: Friday, December 20, 2002 5:22 PM To: gda...@li... Subject: RE: [Algorithms] Yet another stencil shadow question WHAT?! i downloaded that demo and there's very noticable artifacts all throughout. it looks much worse in motion. i'm attaching a small (27k) screenshot: -bernie -----Original Message----- From: Paul Firth [mailto:pf...@at...] Sent: Friday, December 20, 2002 2:24 AM To: gda...@li... Subject: Re: [Algorithms] Yet another stencil shadow question Bernie Freidin wrote: > this isn't true at all - you can get hourglass-shaped shadow volumes which are closed but if you slice through them they contain holes and weird degenerate points. this can happen if during your extrusion you choose to extrude only one or two vertices of a triangle. Not if you've correctly catered for holes in the source mesh, such as discontinuous normals. > a closed shadow volume will only guarantee that there won't be any "streaks" of false shadow through empty space, but there may still be significant artifacts around the shadow itself. I've been able to make correct shadow-volumes from all the geometry I've tried with this method as long as the mesh is closed. In fact, prove it to yourself by downloading http://developer.nvidia.com/view.asp?IO=vertexshader_shadowvolumes and loading your own source mesh. Cheers, Paul. ------------------------------------------------------- This SF.NET email is sponsored by: The Best Geek Holiday Gifts! Time is running out! Thinkgeek.com has the coolest gifts for your favorite geek. Let your fingers do the typing. Visit Now. T H I N K G E E K . C O M http://www.thinkgeek.com/sf/ _______________________________________________ GDAlgorithms-list mailing list GDA...@li... https://lists.sourceforge.net/lists/listinfo/gdalgorithms-list Archives: http://sourceforge.net/mailarchive/forum.php?forum_id=6188 |