I want to make a 3D model of an image but not for animation or other 3D stuff. I just need to have a model of my object to be able to apply textures to different faces of the object correctly.
In this picture I want to to apply the pattern with three.js. How should I do that? Do I need to make a 3D model of that or UV map or both or something else?
There isn't really a simple way to do that, and certainly not one that looks good. Here's what I do, using an example from one of my own projects. This is what it looks like without the finishing details, just the UV mapping/modeling done:
And here is the texture that is applied, which is where you want to get to:
First, I had to model the chair as a whole (which for what looks like you want should be much simpler, there are tutorials on basic shape creation and extrusion modeling all over the place). Then I looked for textures that looked close to what I wanted and applied them to the individual parts (see Adding UV mapping to mesh), giving me the result I asked about in this question: Possible to bake texture to new UV map?
You can then brush in details on the edges in something like Photoshop or GIMP.
