AxF 1.0 BTF At this time these files are not produced by TAC7. This is the only version of these files supported by the AxF SDK. Your download includes an informational PDF and a link to the following files: Material Name: X-Rite_Basketwork_grey_01 Model: BTF (Per View Factorization) 1.0 Settings: BTF Description: Beige, basket-woven thick fibers. Material Name: X-Rite_Upholstery_Spacer_01 Model: BTF (Per View Factorization) 1.0 Settings: BTF Description: Multi-component fabric over glossy plastic backing Looking for more sample files? See the complete catalog here.