What is the standard material conversion ?

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ceti (ceti++at++worldnet.net)
Tue, 23 Sep 1997 16:33:51 +0200 (MET DST)

Because I got visual result really far from what I was expected, I'm wondering
What is the standard conversion from Inventor to OpenGL for the material
definition?

Typically, all inventor's parameters are in a range of 0.0 to 1.0.
OpenGL are in range of -1.0 to 1.0 or 0 to 128

Is the transformation I'm assuming correct ?

Ambient OGL= ( 2* Ambient Oiv ) - 1
Difuse OGL= ( 2* Difuse Oiv ) - 1
Specular OGL= ( 2* Specular Oiv ) - 1
emis OGL= ( 2* emis Oiv ) - 1
shininess OGL= 128* shininess OIV
transparency OIV converted [( 2*transparency OIV )-1] and reported in Alpha
component of material definition

Thanks for your help.
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