/usr/share/camitk-3.2/testdata/liver.mtl is in libcamitk3-data 3.2.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # Generated from SOFA Simulation
newmtl mat1
illum 4
Ka 0.2 0 0
Kd 1 0 0
Tf 1.00 1.00 1.00
Ni 1.00
Ks 1 1 1
|