Creating a 3d decoration using Ultimate Doom Builder

To start, you need to have your project in its own folder, and have the following directories:

Models -- Obj files are placed here

Decorate -- decorate files go in here

Sprites -- For your model's sprite

1. Create your thing, whatever it is. I am making a switch. Create a sector in an empty area if your map, big enough to hold your thing, and delete all the textures on walls, floor and ceiling. This is important. They appear as solid in the model.

2. Textures. On thing, off walls, floor and ceiling.

3. Select the sector with your thing and export as obj. as shown.

4. Name your model, your sprite (Use tnt1 is you don't want to make a custom sprite), flags and select decorate. Look at the directories. Modeldefs go in the root

Decorate goes in decorate

Obj goes in models

Open the decorate for your thing, and add the spawn id

Quote

Actor [Name] 1234

{

Radius x

Height x

Reload resources and you should be able to place your thing in the editor.

Light and animation will be covered in a different tutorial.

Let me know if you have questions.

To fix the model being sideways, open the modeldef, and add the following after the first line:

Rolloffset 90

That'll make your model appear upright.

Building your models horizontally adds a level of detail not possible otherwise. 

Edit: Double post, oops.

How do I create the skins/textures for these models?
Edit: Learned that they are not needed for .obj.
I have been using .MD3 and quake files up till this point, so I learned something new

Models are just textured sectors exported. You texture them just like you texture everything.