I designed a new map editor application for Kreatures, because I found out that I had to change the design to use rooms instead of the collision geometry I was using so sight would work correctly.
I made a video demonstrating using it to map the norn meso as an example:
It's still in development, snapping rooms together doesn't work quite right, there's some weirdness with moving vertices around, and it's apparent that the slicing doesn't work the way a human would intuit it would, when it slices through one room that is much larger than another room.
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