# Standard .mtl material properties
newmtl RGB
Ka 1 0 0
Kd 0 1 0
Ks 0 0 1
Ke 1 0 1
Ns 99
d 0.25
illum 0

# PBR "extension"
newmtl PBR
Pr 0.1
Pm 0.2
Ps 0.3 0.4 0.5
Pc 0.6
Pcr 0.7
Tf 0.8 0.9 1.0
d 0.75
Ni 1.33

# Widen to RGB values
newmtl Wide
Ka 0.1
Kd 0.2
Ks 0.3
Ke 0.4
Ps 0.5
Tf 0.6