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Updated Skyboxes (markdown)

Blixibon 2019-09-16 12:09:30 -05:00
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Skyboxes.md

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**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.
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## 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.
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* **Use Angles for Sky** `<void>` - Uses angles for actual skybox rotation, as if the world were tilted on this entity's axis.
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* **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.
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## 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.