thanks for using Mari Extension Pack.
You are indeed correct, the F0Specular in the MR Region Output of ExtPack 3R2 is encoded R - Specular , G - Roughness, B - Roughness.
This is a bug that I've known about and fixed for the next release.
The easiest workaround is to attach a shuffle node to the OutF0Specular and set it to RED,RED,RED,Alpha.
Alternatively if you want do quickly fix it yourself go to your ScriptsFolder
and replace the JK_RegionOutput_MR.xml in there with the one attached (which is the one from 3R3)
Sorry for the inconvenience.
P.S.: For anyone curious it is a simple fix of replacing
specular = vec4(#IN_D.r,#IN_B.r,#IN_B.r,1.0);
specular = vec4(#IN_D.r,#IN_D.r,#IN_D.r,1.0);
at the end.
Message edited by Campi3d on 8/10/2016 - 2:17 PM