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Light: Adding sun light

This tuttorial teaches you how to light up your map relilisticly using Light_enviorment and adding a seeable sun like this

Setting up the map

First you are going to need to set up your First CSS Room or have a map ready.

Here is mine

Texture the all the "sky" walls of your map with the tools/toolsskybox texture.
Then go to Map -> Map Properties -> Sky box texture name: and name it sky_dust (there are others but meh...)
Next its time to add some light :). Click on the (entity tool) then go over to the right side of hammer and select light_environment in the drop-down box then click some where in the 3d view to add it to your map. Then reposistion it to the main part of your map (so you can easily find it ) and bring it up from the ground (you don't need it at the top of your map because the light comes from the skybox texture, not the entity)
Now time to set the properties of the light. Right click on the entity in one of the orthogonal views and select Properties. First we need to set which direction we want the light to point. to do that, just click the Point At buttion and click where in your map you want the light to go (relative to the entity). Also set the pitch to -90 if you want it to point down. There are two other properties. Brightnes, which is how bright and what color the main light is, and Ambient, which is how bright and what color the ambient light is (the shadows).