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[Bobert]

Hey I'm trying to model a city for a project I'm working on but I don't know how create a proper 3d enviornment. I tried creating a large sphere and putting a sky texture on it but it came out badly. How would you simulate a large, open atmosphere for a city??

[floyd86]

The method you mentions is a good way to create environments. Use a sphere and apply an environment map to it.
Or add an environment in scene mode, read more about it here:
http://anim8or.com/manual/7_scene_editor.html#environment_settings

[Bobert]

   The panorama idea isn't bad but I have some shots that reveal the background color past the panorama (plus I want to learn more about sphere enviornment maps). 
   I want to learn how to use a sphere to properly create an enviornment map. When I tried and did test renders, the sky texture was horibbly stretched and it was obvious that my city was in a giant sphere. I want to know how to get rid of this problem and give the illusion that the city is in a large open space with an atmosphere. Is there any specific tutorials or tips on this?

[kreator]

Try one of these skies on your hemisphere, Use the HDRI ones rather than the panoramics or ordinary images ones There are two HDRI Skies with an H on them right click and download then apply to your hemisphere
http://www.animanon.com/html/skies.html

[hihosilver]

You can also use a cubemap in two ways.

Either you can use the built-in cubemap texture tool for the background (Settings>Environment)
Or, make a cubemap texture and apply it to the sphere.  That way you wont get stretching.