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a doorway or opening that connects two areas of the game space, even if those areas aren't adjacent & aligned in the physical layout of the environment. Players can typically see and move through the portal into the linked space. Portals were most famously used in the Valve's Portal game series, where the player can shoot linked portals onto various surfaces and traverse between them to solve puzzles.
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How to implement collision detection of portals?
For example, take this scenario (excuse my horrible drawing skills):
This is based on "Portal", where the stickman is going through the blue portal (which is linked to the red portal), but there is …