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Floor and ceiling can turn into sky when switching from Polymost to Polymer in E1L2  "Specifically in the first bathroom you come across"

User is offline   Doom64hunter 

#1 Posted 03 January 2020 - 05:39 AM

Start the game in Polymost, start E1L2, go into the first bathroom with one toilet, and make sure the door is open.
Then switch to Polymer. If done right, the floor and ceiling texture disappear and are replaced with the skybox.

Attached Image: duke0082.png

This does not occur if you started the map in Polymer or switch to Polymer before opening the door to this room. It does not occur if the door is closed when switching renderer.
Tested with r8533 and appears to go back to the earliest versions of eduke32 that had the Polymer renderer.

This post has been edited by Doom64hunter: 03 January 2020 - 05:40 AM

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User is offline   Phredreeke 

#2 Posted 03 January 2020 - 08:57 AM

As was said on the Discord, it's because once the door opens the sector geometry becomes invalid. It's documented on the wiki too

Quote

doesn't save known good geometry in savegames for use as a fallback when map effects become corrupt, revealing errors that otherwise would be avoided

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