| it's easy my friend :)
if you 're using 3ds max do what's next:
-take a copy of the door & convert it into editable polygon
-go to the subobject edge,then choose the edges beside the area you want to be black and look for a button in the edge subobject called (creat shape from selection)this will give you a seperate shape just like the edge of the area you want
-now you can shape it as divisory of the door and make it black
okay? :) try this solution & till me if i could give you a helpful note |