I am playing with carpaint material and I think I found there is a problem perhaps in luxrender, perhaps in luxblend25, I don't know.
In the pdf the developpers (jeanphi I suppose) followed to create the carpaint material, there is a table where you can find these values for BMW 339 carpaint:
Absorption 000000 (not in the pdf I set it to 000000 as jeanphi suggested)
Diffuse .012 .015 .016
Spec1 .062 .076 .08
Spec2 .11 .12 .12
Spec3 .0083 .015 .016
Well if you render with the above carpaint material you get a different result than if you render choosing the BMW339 preset.
The preset gives a much more carpaint look. The values from the pdf gives much more matte material.
Is possible to know what values is the preset using ?
9/11: inside job ( I am usually asked to delete this from my signature in forums)