select the entity and press
Ctrl + U
or enter the console (~) and use the command U (or UNIQUE)
it's a bit convoluted but you can:
you need to put it in a .png file in the Zortch\editor\mapskin\ folder
and then add a new entry for the Zortch\editor\mapskin\tiledata.script
file so to the editor can see:
e.g. ADDTILE yourfilename.png 3560 1.0
and then for the game to see it you need to create a Zortch\data\mapskin\ folder
and put it in there too (don't have to edit scripts in this case)
the skybox is even more complicated:
you need to create a Zortch\data\sky\ folder
and inside that a folder for your skybox e.g.: Zortch\data\sky\yourskyboxname
in there you need six files:
sky_up.png
sky_rt.png
sky_lt.png
sky_ft.png
sky_dn.png
sky_bk.png
you can use for reference the existing ones: the data.dat is just a giant zip file
and to make it work on the level you will need a Zortch\custom\anynameyoulike.script
file and the command need to look like this:
ADDMAP yourmapname
SETMAPSKY yourmapname "yourskyboxname"
to add insult to injury it will only work if you load your map from the custom map option:
for it to work with the editor PLAY command:
edit Zortch\data.dat\data\map\maplist.script
and replace the last two lines ( SETMAPSKY preview "canyon" plane )
I guess I should start on a patch to make this easier 🤔