Added GTR1 MDF shadowing function.
Added GTR1 MDF shadowing function.

Aakash1312/appleseed,luisbarrancos/appleseed,est77/appleseed,gospodnetic/appleseed,luisbarrancos/appleseed,aytekaman/appleseed,Aakash1312/appleseed,est77/appleseed,pjessesco/appleseed,aiivashchenko/appleseed,Aakash1312/appleseed,Vertexwahn/appleseed,Biart95/appleseed,luisbarrancos/appleseed,glebmish/appleseed,appleseedhq/appleseed,est77/appleseed,Biart95/appleseed,aytekaman/appleseed,est77/appleseed,aytekaman/appleseed,appleseedhq/appleseed,pjessesco/appleseed,gospodnetic/appleseed,pjessesco/appleseed,dictoon/appleseed,dictoon/appleseed,appleseedhq/appleseed,aiivashchenko/appleseed,gospodnetic/appleseed,aiivashchenko/appleseed,glebmish/appleseed,aiivashchenko/appleseed,Biart95/appleseed,Biart95/appleseed,glebmish/appleseed,appleseedhq/appleseed,aytekaman/appleseed,luisbarrancos/appleseed,aiivashchenko/appleseed,est77/appleseed,aytekaman/appleseed,pjessesco/appleseed,Vertexwahn/appleseed,gospodnetic/appleseed,glebmish/appleseed,gospodnetic/appleseed,dictoon/appleseed,glebmish/appleseed,luisbarrancos/appleseed,Biart95/appleseed,Vertexwahn/appleseed,dictoon/appleseed,Aakash1312/appleseed,Vertexwahn/appleseed,Vertexwahn/appleseed,Aakash1312/appleseed,pjessesco/appleseed,appleseedhq/appleseed,dictoon/appleseed