Does anyone know what this texture error is? Created 4 years ago2020-09-01 13:31:10 UTC by I have a plan

Hello everyone!

So, back at it again in the OG texture work. But I've stumbled across a strange bug.The black line is present in both gl_texturemodes. When I switch to a normal texture (Like tiled ground or something) the glitch isn't present.
Anyone have an idea whats causing this?

Happened to me on angled terrain in red erosion map, where my textures were flipped one away from the other. The explanation i was given was "its a bug in the opengl code". It also happens to me with transparent textures like trees where it draws a thin black line at the top, or bottom depending on the orientation. The said errors did not appear while the game was in Software render mode.

That is caused by linear texture filtering, where the edges between each individual pixel are blurred. OpenGL does not care about the texture boundaries, nor any neighbouring faces, so it blurs every single pixel in the texture.
If you use gl_texturemode gl_nearest_mipmap_linear, this should be gone.

Otherwise, you probably have no option but to shift the texture 1 or 2 texels toward that other texture, so you can prevent the artifact from appearing.

Thanks for the advice lads! I'll implement it!
Maybe I should Remip them in Wally!