Btw. Allegro comes with an example that displays a skybox: https://github.com/liballeg/allegro5/blob/master/examples/ex_camera.c

Here, here!

Some things are the same in every part of the world.
I wonder what they use in the amazon forrest

Probably small furry creatures.

It's a feature!

You're just holding the monitor wrong.

Looks like you're using an orthographic view instead of a perspective one.

Here's the complete source code with Code::Blocks project for my City3D. It's a project I have been messing around with since 2004. It includes a separate Allegro 4 project for the map editor (already compiled), it's just a 2D editor that saves to the same map name each time. If you're curious about other maps, just rename them to city.map and the program will load them.

The main program doesn't use Allegro, it doesn't use anything (except the freeimage library, though I have separate code to load uncompressed TGAs which can be used instead). This is a Windows (IE: WinMain()) project, no allegro, no sdl2, nothing. It was something I started in order to learn a little straight Windows coding. The OpenGL stuff is pretty straight forward, if you can handle my coding style and C only code.

Oh, and I changed my code to use all QUADS, no triangles, though they could be used, I tried to keep it as simple as possible to make learning OpenGL easier, which is why I also stuck to a grid layout and cubes at the time (before Minecraft! heh).

I added in keys (listed on the main screen when you run it) to show wireframe mode, so you can see what is drawn. TO enable/disable Vsync, to enable/disable fullscreen mode, disable the onscreen text (except the FPS) which can speed things up a tad. SHIFT key goes super fast, use E and Q to fly up in the air (better when zipping around the map). Frustum culling can be toggled, note, my frustum culling is simple, and only culls to the right and left, but doesn't take into account your angle looking up and down (because this was meant to be only driving, no flying and looking up and down). You can toggle the skybox on and off as well etc... the code may help. Maybe try converting this to use Allegro as the main framework? I plan to convert this to modern opengl, should be interesting to see the FPS difference.

https://www.dropbox.com/s/r4bea14ll60vcz9/City3D_source.7z?dl=0

Hah, I stayed up all night too. I feel like shit today though.

Append:

I guess this wasn't the O/T thread... Whoops.

I think it would be nice adding an actual texture to the ex_camera skybox - maybe I'll do that tonight. The skybox code in there originally is from a textured version so I can just copy&paste it back in and I'll add a command-line paramater to specify a picture with the skybox.

Otherwise, from your screenshot it definitely looks like some of the UV coordinates are off. Also - are you sure your camera is inside of your box? It won't work if you look at it from the outside.

You're using Orthographic projection. That is not 3D and will never work.

I never did test that image. Is it edge clamped? I attached the original separate images in a 7z to this message if you want to work with them, to redo that.

Ah, okay. Yeah, it is much simpler than some realize. A sort of optical illusion. The concept is simple enough. If you want a 360 degree view all around you, and you have four sides all the same size, than you make each view 360/4 degrees, or a 90 degree field of view.

Terragen is handy for that, it's what I used. It doesn't have degrees (the old version anyhow), but the ZOOM factor when set to 1 even, equals 90 degree field of view. After that, just render each direction to a 512x512 texture and you're all set.

Anyhow, the original pics are in that zip if anyone wants them separate. I only done it in that single cross shape because that is the most common I find online.