[type] float texture [description] The index of refraction for the glass surface [default value] 1.5 [name] 
roughglass::index
r o u g h g l a s s : : K r
r o u g h g l a s s : : K t
r o u g h g l a s s : : u r o u g h n e s s
r o u g h g l a s s : : v r o u g h n e s s
r o u g h g l a s s : : i n d e x
r o u g h g l a s s : : c a u c h y b