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can somebody tell me what does number 9 means in parameter PTC_MTERIAL_TYPE?
As a SWAG, the only thing I can think of is the number is a default placeholder value
If you edit the material definition
(file > prepare > model properties, select to change the material then RMB the assigned material selecting properties)
select the User Defined tab (just below Density) and a table appears.
I was playing around by adding information (select the green "+" at bottom left)
It looks to be somewhat similar to some values in the .mtl file.