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You're welcome. If you have any questions or issues, let me know and I'll try to help. And if you'd like to show the thing you're working on, I'd be happy to take a look at it :)

Hi!

Thanks for the offer! 
I tried to implement your way of making the cap, but I'm stuck :/  What I did:

1) Getting the intersection between the portal plane and the camera near plane (this is a 2D line on the near plane)
2) get the nearest point to the center of the near plane (which is orthogonal to the "intersection 2D line“ from step 1)
and then I have no idea how to build a useful capping geometry out of this information.


Are you building the capping quad in front of the near plane directly? As soon as my camera has minimal offset to the portal plane, the intersection from portal plane and near clip plane is not in the frustum anymore :/
I could add some screenshots, but I don't think this would really fit into the forum which should be about "tea for god" :)

Thank you very much in advance!

ps: I am doing a pure research project to understand how it works :)

Hey, send me an e-mail to contact@voidroom.com and I will send you drawings of how to build a cap with some source code (although you may need to rewrite it a bit, to match you needs, axes etc)