http://www.frictionalgames.com/forum/thread-17299.html
1) Copy the entity's folder and paste it into your CS folder.
2) Start renaming the folder and every file in it, but keep a pattern. i.e:
- folder: new_tinderbox
- new_tinderbox.dae
- new_tinderbox.ent
- new_tinderbox.dds
- new_tinderbox_spec.dds
- And so on for each file....
3) Delete the .mat and begin editing the .dds texture to your preference.
4) Save the new texture that you have created and overwrite. Continue with the specular and normal if necessary.
5) Open the .dae in Notepad, Notepad++ and search "
library_images" (no quotations). You will see a long directory inside of it. Delete it all and type it like this:
<init_from>new_tinderbox.dds</init_from>
6) Overwrite the new .dae.
7) Open ModelView and load the new_tinderbox.dae.
It should load with the new texture and automatically generate a new .mat file. if the specular and normal do not show, simply open the .mat in the MaterialEditor and add them. Save and you're good to go.