My friend and I are setting our first steps in creating maps, but we’re already having a first problem. When we try to build a map which is not a hollowed cube, it says: map leaked.
I know it’s got something to do with the map being exposed to the void, but how do I solve this?
how to solve map leaks
But if they have a map designed only in interiors, the VIS will be calculated outside 
In GtkRadiant, when it happens, you should have a red line drawn in 2D and 3D modes to locate where the leak happen; Your map has to be sealed with structural brushes (When you make a brush it is by default structural so no worry for learning).
but can I make this sealed box invisible someway, otherwise it just looks weird and not realistic that the entire map takes place in a cube.
[QUOTE=Mateos;439676]How is your map layout? Is it inside or outside?
Maybe a screenshot if you can?[/QUOTE]
no he cant because the map leaks…
cant compile a leaked map
And if he gonna see the box around the map, what he needs is a skybox 
[QUOTE=thunderpwn;439697]no he cant because the map leaks…
cant compile a leaked map
And if he gonna see the box around the map, what he needs is a skybox
[/QUOTE]
Still, he can make a screenshot from the editor 3D view :3
And again a skybox would be needed if his map is in exterior
If it’s only interiors there would be no need.
It is an exterior map. The map isn’t much yet. It’s just a sort of large box without ceiling.
Does this mean that the map leaks because I don’t have a skybox?
Yes, the playable area has to be separated from the void outside, so you need in case of exterior a culled box (Made of 6 brushes for N/E/W/S and top/down), textured with Caulk, and the inside of these with a skybox shader, like textures/skies_sd/sd_siwasky (Press S and copy/paste this in the Texture field; Will appear as missing shader but it is OK).
So I just need to make a gigantic cube and give every side a skytexture?
How do I make one picture of a texture fit over a whole side of the cube?
[QUOTE=yankeedoodle;439740]So I just need to make a gigantic cube and give every side a skytexture?
How do I make one picture of a texture fit over a whole side of the cube?[/QUOTE]
No need to, use the texture mateos told you and it will automatic be a sky
If you stretch it, the sky will be stretched :3
For other textures: press S while you’ve selected and textured a surface, there’s a button Fit, it will do the job 