Updated Skyboxes (markdown)

Skyboxes.md

@@ -1,8 +1,8 @@
-**sky_camera** is the entity used to create a skybox. The area around it will be projected around the map via the `tools/skybox` texture.
+**sky_camera** is the entity used to create a skybox. The area around it will be projected around the map via the `tools/skybox` texture. [Click here for more information on sky_camera in Source.](https://developer.valvesoftware.com/wiki/Sky_camera)
 
-Outside of Mapbase, sky_camera is static. Once it's been placed, the skybox can't move. You can move the sky_camera itself through things like logic_measure_direction, but it doesn't update the skybox. There is a trick to update the skybox by continuously removing and respawning the sky_camera, but this is crude and usually isn't very smooth.
+Outside of Mapbase, sky_camera is static. Once it's been placed, the skybox can't move. You can move the sky_camera itself through things like logic_measure_movement, but it doesn't update the skybox. There is a trick to update the skybox by continuously removing and respawning the sky_camera, but this is a complicated workaround and usually isn't very smooth.
 
----
+## Moving skyboxes
 
 In Mapbase, sky_camera has been updated to support parenting and continuous updating. Not just that, but there's a new option to use the sky_camera's angles for actual skybox rotation rather than fog direction.
 
@@ -12,14 +12,29 @@ Together, these changes create the ability for the skybox to move around freely
 
 * **Use Angles for Sky** `<void>` - Uses angles for actual skybox rotation, as if the world were tilted on this entity's axis.
 ---
-* **ForceUpdate** `<void>` - Forces the 3D skybox to update with this sky_camera's position.
+* **ForceUpdate** `<void>` - Forces the 3D skybox to update with this sky_camera's position once.
 * **StartUpdating** `<void>` - Begins per-tick skybox updating, which is needed if you want this sky_camera to move.
 * **StopUpdating** `<void>` - Ends per-tick skybox updating if it was enabled before.
 
 There's also a spawnflag for a sky_camera to spawn continuously updating its position.
 
----
+## Multiple skyboxes
 
 HL2: Downfall's multiple skybox support has been added as well.
 
 (todo)
+
+## Sky color
+
+Mapbase adds the ability to use a specific solid color instead of a sky texture, controlled with the `SetSkyColor` input on sky_camera. The color is enabled and disabled through the "alpha" value, or the 4th number in a color. For example, you could use `SetSkyColor > 0 255 0` to turn the sky green and `SetSkyColor > 0 255 0 0` to turn the sky back to normal. Blending the sky color with the skybox was attempted, but is unfortunately not possible. Any alpha value above 0 enables the solid effect while 0 disables it.
+
+This was intended to be used to make the skybox match the color of dense fog, but HDR causes a noticeable contrast in between the world and the sky. The pictures below show a skybox with thick blueish fog and the result of setting the sky to the same color, highlighting the HDR problem.
+
+<p align="center">
+<img src="https://cdn.discordapp.com/attachments/526449481252601863/603706099098452139/mapbase_demo030039.jpg" width="384"/>
+<img src="https://cdn.discordapp.com/attachments/526449481252601863/603706133366046720/mapbase_demo030041.jpg" width="384"/>
+</p>
+
+## New fog inputs/keyvalues
+
+`sky_camera` now has inputs and keyvalues from `env_fog_controller`, which allows for more skybox fog control. Lerping is not yet supported.