Updated Skyboxes (markdown)

Skyboxes.md

@@ -1,12 +1,25 @@
-sky_camera has received some interesting changes, which will be outlined in this article.
+**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.
 
-# Movement
+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.
 
-Three important changes have been made to sky_camera:
-* The ability to update position (moving sky_camera)
-* The ability to be parented to another entity
-* The ability to rotate (rotating the world's perspective of the skybox)
+---
 
-These changes create the ability for the skybox to move around freely.
+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.
+
+Together, these changes create the ability for the skybox to move around freely relative to the world.
+
+#### I/O/KV
+
+* **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.
+* **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.
+
+---
+
+HL2: Downfall's multiple skybox support has been added as well.
 
 (todo)