How can I make an object render with a wireframe in the game engine?

Question

I want it to look like the top image when I press P, so it has those lines around each face.

Like this:

Not like this:

Answer 1

You want to create a wireframe material. A quick 'n' dirty way to do generate a wireframe texture is described below:

1. Unwrap your model. If you don't know how to do this simply select everything and press CtrlE > Mark Seam.

2. Press U > Unwrap.

3. Open up a UV/Image editor:

   

4. Click UVs > Export UV Layout. Remember where you save this image.

5. Press AltO to open a texture, then select the saved image.

6. Tada!

   

You may want to remove the transparency in an image editor if you want your model to be opaque.

Answer 2

For real wire frame you activate Wire on the material type, see picture: