Making letters (Blender)
Get Blender and install that badboy: https://www.blender.org/download/
Get yourself a font, I highly recommend using something with sharp edges. (curvy parts will give you complicated / dense meshes, not fun)
Unpack the font file, right click on it: Install for all users.
Go ahead and open the Blender now, create a new General project.
Before we start, let's install the export plugin as well
Unpack, in blender go to Edit -> Preferences -> Add-ons and press the Install button, find the file -> Install Add-on, then make sure it's checked in the list. (To confirm you should see it under File -> Export: MD3 (+shader)
Delete everything in Scene Collection.
Press "Add" button on top right or Shift + A and select "Text"
Go to object data properties menu: green "a" symbol on right side menu.
6a) Paragraph section -> Alignment: Horizontal and Vertical alignment to center.
6b) Font section -> behind "Regular" press the folder box and find your font.
6c) If you want 2D text (why?) then ignore this: Geometry section -> Extrude
6d) Hit TAB button to edit the text as you please.
6e) Go to Object mode. Top right "Edit mode" -> "Object mode"
Right click on screen: Convert to mesh
7a) Under Object Properties, Scale section, pump it up like 40x
Textures. Navigate to Material Properties menu, red ball thing on right side menu.
8a) New -> Base Color -> Image texture. Click Open button under it, then and find your texture.
8b) Change the material name to your texture / shader path.
e.g. my model and texture will be in: models/mapobjects/mymapname/letters
so my material name will be: models/mapobjects/mymapname/letters/bl.jpg
If you want to use shader then something like: models/mapobjects/mymapname/letters/myshadername (no extension here)
Go to UV Editing window, button on top bar.
9a) On right side window press a to select everything then press UV button on top menu -> unwrap
9b) If you want to scale the texutre then on left side press x -> s and move mouse to scale.
Go back to Layout window, top menu.
10a) Modifier properties -> Add modifier: Triangulate
10b) On bottom of the screen there is animation controls, set End to 1
Make sure your object is selected, File -> Export -> MD3 (+shaders)