Having trouble figuring out how to setup cameras in blender to make a custom skybox in Blender? This thing has you covered with a blender file containing the right camera setup as a template, along with an example blender file, skybox, and map which can be looked at. Here is what the Readme file for this thing looks like.
In this zip are 2 blender files:
"skybox_example_scene": an example of what a skybox would look like
"skybox_template": the camera setup for skyboxes/cubemaps
The "png" folder is where I placed the 6 renders from the skybox_example.
Then the "tga" folder is where I placed the tga files that work with HL1.
for the naming of these renders:
ft = front
bk = back
lf = left
rt = right
up = up
dn = down
(How I've been doing it) I've been using a software called XnView MP for converting the exported
png files into tga files. I've included a screenshot of my export settings with said software.
Although I think I could be using an older version of XnView, so it could look different if using
a newer version if there is any. Looked at it, and it says I've been using Version 0.93.1 so
that's something.
Inside the "in-game example" folder is the sample skybox and a test map using it.
Having the same file structure, all that's needed to install these things onto your steam copy of
HL1 is to drag the "valve" folder into the directory of your game.
To play the map included, launch the game, and type "map skyexample" into the console.