Talk:Sky

Hi,

there is following description about sky textures:

"They are always drawn with their tops at the top of the view window and their zero column at due north."

My observation during a test with a custom sky texture, however, was that the zero column is located due East and the sky texture is mapped in counter-clockwise order. That means, the sky texture is horizontally flipped.

Looking onto a map, this arrangement would follow the polar direction in a carthesian coordinate system. The positive x-axis has the angle 0°, the positive y-axis has the angle 90°. Therefore, a polar vector rotates in counter-clockwise drection. I think, it would make sense that the doom engine follows these conventions.

I tested the sky with doomlegacy. I'd like to know is someone could assert these observations.

Tankjob

Update: After more tests with the original doom engine I added the info. The flipped sky texture is also mentioned in the Unofficial Doom Specs.