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Improved Default Cubemap

The fallback cubemap that has plagued incomplete and broken maps since 2004 finally gets a makeover! I made one that doesn't stick out like a sore thumb in most lighting conditions.

Now you can use broken maps without burning your eyes out before they're fixed.

Replaces
- Still ugly and wrong, but less ugly
- Works in LDR and HDR maps (using a single texture)
- Uses sky_day02_07 skybox from Half-Life 2
- Neutral color and low saturation
- Better sky/ground separation
- Nondescript ground appearance
- Similar overall luminosity (Doesn't look any worse in dark areas than the original.)

This DOES NOT magically "fix" broken or missing reflections in maps that haven't baked/included their own cubemaps correctly. They will always look wrong until that happens.

They are very easy to add, even for beginners. You are a bad mapper if you don't.
If you are seeing this texture somewhere, please tell the map author to bake their cubemaps.

Guide for mappers to troubleshoot cubemaps because Workshop breaks them for no reason sometimes: https://test-steamproxy.haloskins.io/sharedfiles/filedetails/?id=861820969


Regardless, I hope this comes in handy for when the fallback cubemap does rear its ugly head.