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Question about "Portal connections"

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Hi Friends, I am trying to learn portal rendering (I have some free time now :) ) Rather than creating portals manually i tried to create portal automatically using BSP Tree, (since BSP node contains Convex polys) . Next i divided the initial portal polygon at each node with the divider polygon at other subnodes of parent. When it reaches a leaf node i make that polygon as the portal of that leaf node . Is this procedure is correct ? Also i would like to know how to generate connected portals for a particular leaf node . Seeking someone's help , I have already spend many days :( Thanks KD

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