What you need to do is apply a black alpha channel to the diffuse texture(s) of the locomotive.
In gimp, this is done by going to "layers->transparency-> add alpha channel." Then, go to "layers->transparency-> color to alpha." A smaller window should appear allowing you to change the color of the alpha channel. After changing the color, click "okay."
I would recommend applying a black alpha channel after you have finished your texture.
In gimp, this is done by going to "layers->transparency-> add alpha channel." Then, go to "layers->transparency-> color to alpha." A smaller window should appear allowing you to change the color of the alpha channel. After changing the color, click "okay."
I would recommend applying a black alpha channel after you have finished your texture.
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