I think when you upload your textures in psd or bmp or png or jpg formats and such, you dont really have very software specific textures. Just write down what file format you deliver ur textures in.

If you already import them inside a 3d program and offer the files from that specific 3d program you would ofcourse need to specify this.

1024x1024 format will be okay, but higher then that would be better.

photo resources as far as i know are just photographic resources? so photo textures would be photo resources.

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