Getting to the way it's supposed to be!

modules/ufbx/data/synthetic_simple_materials_0_mtl.mtl

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+
+# 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