I'm trying to displace a plane with a black and white texture for a Doom level map. What I am looking to get is a 90 degrees displacement all around, but the problem is the corners come out distorted even though the texture shows only straight angles. I checked the texture in GIMP and it shows zero grey pixels so that can't be it. I also increased the subdivision to 6 but it doesnt solve the problem either. Any advice on how to get the displacement to be only at 90 degrees?
Some of the texture settings I am using:
Another close up picture of the issue:
The less plane subdivisions the wider the distortion gets:
Edit: I tried it in Unity terrain and it seems I am getting the same issue:
As @Lukasz-40sth said, I did the contour manually and extruded the edges and it works although it is time consuming. I wonder if a script could detect the texture edges and create the 'physical' edges.