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Quick question: This tutorial saysQuote
Now, let's set up a bit to prepare for adding flats and textures. Create the following entries as marker lumps, in order: FF_START, F_END, PP_START, PP_END. (Note how there's only one F in F_END, even though there are two in FF_START. This is one of the many little quirks that await the Doom modder.)
And a bit later on...Quote
Once you're finished, it should look like this:
So which is it? P_END or PP_END?
It doesn't matter. Those markers aren't even strictly necessary.
Read this to learn more: https://doomwiki.org/wiki/Adding_custom_textures
You need a Textures lump. Seems like the tutorial you are using eventually gets to that:Quote
Select them all, then right-click and in the context menu, choose "Gfx → Add to TEXTUREx". This will automatically add them to the patch table, too. (Whereas if you choose "Add to Patch Table", it will not automatically add them to the texture list.)
That will automatically create a Textures lump since you don't have one.