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Troubles with Portals...

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Hello I am trying to implement a 3D portal engine using the algorithm presented in the book "Real-Time Rendering" pg. 201, but I am having troubles with the following thasks: First of all, as my portals are of diferent shapes, not just rectangulars, I simplify it to a simple AABB, but here comes my troubles. Could someone tell me how can I project my portal AABB from world space to screen space?, and how can I build a frustum from a AABB? I really appreciate any help about this. Regards, Oscar

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