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Generating polygon on plane

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Hello! I''m currently implenting automatic portal generation tool, but I can''t figure out how can I generate polygon, bigger than scene''s(node''s) bounding box, on particular plane. Can you help me, pls? Thx

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Pls!!! No ideas?? My only idea was to test intersection between all edges of scene bounding box with plane and then, I should have 4 vertices of newly generated portal polygon. I hope it''s correct but it''s slow...

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I''m not sure what you''re asking for. Do you want to project a bounding box onto a plane, or do you want to intersect a bounding box with a plane? Your second post indicates that you want to do intersection, but it''s not clear.

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