Terrain
@yishbarr: that's kind of a messy advice, if I may say.
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Skybox: there are 2 different kinds, 2D and 3D. The easiest way is the 2D skybox (which is what yishbarr was referring to), though this one doesn't allow skybox models since it is applied in flat surfaces by texturing a brush's side with the texture toolsskybox, then opening your map's properties and selecting one of the stock skys (you can also use a custom one too, there are many in the internet, by simply dropping the files into your materials/skybox folder). The 3D skybox does allow 'skybox models' and a lot of stuff as yu can see in the wiki.
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Terrain: you create out of displacements, and these are made by the Face Edit Sheet. You can select a variety of textures for displacement (or can make a custom one), search for 'blend' in your texture browser to find those that can be used here.
yishbarr wrote:
for the ground, make it bumpy with the vertex tool.
Dude is you stupid?
Use displacements.
iWork925 wrote:
yishbarr wrote:for the ground, make it bumpy with the vertex tool.
Dude is you stupid?
Use displacements.
Dude, I is hammer starter, and wrote this non tutorial on phone.
iWork925 wrote:
Oh I sorry. That seem like good excuse to give bad advice. My bad.

yishbarr wrote:
Not excuse. The person needs help. I is saying what I is know. Be my guest and give the person good advice. I is say that.
So its ok to give advice even if you have no idea what you're on about? Jeez.... In that case snapper, disregard the displacements. Terrain should be made by using the carve tool!
yishbarr wrote:
Not excuse. The person needs help. I is saying what I is know. Be my guest and give the person good advice. I is say that.
If you yourself are not going to be giving good advice, then simply don't give any. Giving out "newbie information" is a terrible idea, because more often than not you perpetuate half-truths and partial solutions.
It's great that you want to help. Just make sure you're helping the best way that you really can.
Wouldn't you be confused, if you needed advice on something and a beginner gave you some that is completely unreliable and that would cause problems?