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Naming convention would be: po_op_XXX_t.dds (where T would be the appropriate size ID) if a generic "thing" else follow race conventions for Dwarfs, Elves etc.. XXX can be 9 characters long. This is because of portraits.2da limitations (you are forced to use po_ as a prefix!)
Portraits Based off HD Models
CatPerson Fimbul K has done a portrait based off the HD models (with an added hat):
This looks pretty good, need to see about trying this out with some techniques. To look similar to Bioware's;
- Background colours + stuff going on, borders around the model perhaps
- Lighting: Sort an in-game studio with a rough greenscreen
- Painting technique; ask CatPerson for some help here