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#87 mtl shininess value
Using Assimp 3.0.1270 when reading the following wavefront obj mtl file:
newmtl Material_floor.jpg
Ns 96.078431
Ka 0.000000 0.000000 0.000000
Kd 0.640000 0.640000 0.640000
Ks 0.500000 0.500000 0.500000
Ni 1.000000
d 1.000000
illum 2
map_Kd floor.jpg
For shininess I get back 384.314, and shininess strength is 1.0.
It seems that Ns is multiplied by 4 in line 534 in ObjFileImporter.cpp:
pCurrentMaterial->shineness *= 4.f;
According to the mtl specs (http://paulbourke.net/dataformats/mtl/):
Ns exponent
"exponent" is the value for the specular exponent. A high exponent
results in a tight, concentrated highlight. Ns values normally
range from 0 to 1000.
I'm not sure what the shininess range in Assimp is, It is 0-128 in OpenGl.
But now shininess is scaled to 0-4000.
I believe shininess should be the same regardless of the import format, e.g.
if I import the model from collada for example.
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see: https://github.com/assimp/assimp/issues/123