Sonic the Hedgehog Games Model Ripping

[TeridaxXD001]

I rip adventure and adventure 2 including stages. I can also rip other Sonic games like Generations and everything using the hedgehog engine, but not stages. (I can do the meshes but the textures don't come out right)

How do you do that? There's a few Dreamcast-only models that I'd like to see.