In the image you can see a simple way of how I've used the photographs that I gathered in order to texture the excavator. I've made my UVs so that the tracks are tiling, i did this because it allowed me to increase their surface area in the UV map and therefore increase the resolution dedicated to the tracks. This also means though that whatever textures i place on the track have to also tile, otherwise there would be many unsightly seams running across the tracks. So all i did was take part of the tracks from a photograph i took, cut, trim and tweak it to the extent where it could be tiled. I then split it in half and placed one half at the top and the other corresponding half at the bottom where the seams will be. Placing them that way means they fit together almost perfectly and therefore hide any seams. I then repeated the tracks between the two halves to fill in the rest of the track.
I then took a flaking metal photograph i took and placed it underneath those tracks and changed the layer to multiply. It still needs more work so that it isnt so basic, but i'm just showing how i have tiled the tracks in the diffuse texture. The same will have to be done for the normal mapping I intend to place on the tracks, but this should be easily done by following the same steps, only making it clean and removing the noise so that the normals look well placed.
Here is a screen shot of the tracks, but larger, so that you can see it tiling. I only used 4 faces, so the rest are tiling one after the other.
As i said, there is a lot more work to do on them, adding details like bolts that connect the track links together, adding dirt and other environmental factors like that.
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