slime wrote:The way I understand it the interface works out the difference between the IORs of the interior and exterior volumes
Here have another drawing, i highlighted the interfaces with red lines
About having an interface between glass2 and rough glass, I don't think that is what glass2 is meant for. You can work out the difference between IORs by hand if you want to use other glass materials
A surface can't be smooth on one side and rough on the other, so if you have for example a liquid (smooth surface) inside a rough glass, the interface between the liquid and the glass will have to be defined as rough. The interior/exterior properties can be attached to any material.
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