Bump maps in train simulator

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my first idee of the trailer textures i wanth to provide an difuse map / bump map /and a specular map! Wath texture file format do you like to use ? Photoshop image file format, tga image format, bmp image format or ace file format.?.So i have some questions for skinners and modellers. i wanth an easy extendable/skinable trailer! i wanth to make an reskinable / developers version of the trailers. Im investigating a little bit on my new upcomming addon trailer wagons.

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