Improper plane reflection of geometry when viewed through portals

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Jaxxoon R

Improper plane reflection of geometry when viewed through portals

Post by Jaxxoon R » Wed Dec 21, 2016 19:52

Reflective planes don't seem to function properly when combined with plane portals, as once you leave the portal area they reside in they stop reflecting anything outside of it. As seen here, once the viewpoint crosses the portal boundary the upper area is no longer reflected by the lower one.
1.png
1.png (213.6 KiB) Viewed 118 times
2.png
2.png (207.67 KiB) Viewed 118 times
I've included a map where this occurs. It's easiest to use the fly cheat to move between the portal sides repeatedly. Doing this while moving backwards fast for long enough will also cause a Doomguy sprite to move really, really quickly across the room, so quickly that I wasn't able to get a screenshot of it. I remember something similar-looking happening back when wall portals were still in their early phases.
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Graf Zahl
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Re: Improper plane reflection of geometry when viewed through portals

Post by Graf Zahl » Thu Dec 29, 2016 19:56

Fixed. This was caused because looking down a portal masked out any subsequent upward portal. A reflective plane must invert this because it inverts the view direction.

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