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rendering capped cross section

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Hi, i am currently playing around with rendering of cross-sections in realtime architectural visualization. The goal is to cap cross sections between the clip plane and the geometry revealing backfaces. The current approach is to render the geometry double sided with a user clipplane and tracking backfaces in the stencilbuffer (using two-sided stencil). The clip planes themselves are rendered in a second pass - only drawing the pixels marked as backfaces in the stencil buffer. This works reasonable well but requires a very clean model with proper back/front faces. Additionally it doesnt work on geometry like glass windows which is rendered two-sided anyway. Are there any other approaches to get capped cross sections? Thanks for any tips. -- stephan [Edited by - stephanh on June 23, 2008 2:40:11 AM]

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