Frosted glass

[giuliettanice]

I'm sorry for walls color, I forget to change the value in the file that I sent you
Can I see the option of the sphere of glossy translucent..it is assigned at the outer layer of the sphere right? and the inner side is remained unchanged?

[jeanphi]

Hi,

I've had a look at your file and I can see various issues:
- you don't seem to be modeling andsettings materials after real measured data (wall colors have unrealistic values, the lamp position seems off, I'm realy not sure about your sphere geometry with an inner shell
- the roughness is most probably too low
- looking at the bubbles on the photograph, I really wonder if the frosted effect comes from the outer shell, a volumetric effect or the inner shell if there is one

Also note that the roughglass material uses an autoshadowing term that doesn't take into account interreflections and can overdarken the material when using high roughness values, you can compensate by mixing in a mattetranslucent or glossytranslucent material like has been suggested.

Jeanphi

[SATtva]

Can I see the option of the sphere of glossy translucent..it is assigned at the outer layer of the sphere right? and the inner side is remained unchanged?

I've joined both meshes, inverted normals for the inner part and replaced their materials with glossy translucent with transmission=1.0 and reflection=0.0. IOR and roughness was copied from the rough glass material settings. Once again, you should assign an internal volume with proper IOR to the material to achieve correct refraction, which is missing on my image.

[giuliettanice]

you've reason glossy translucent is better..now I explain you because I put glass2 in the inner layer, in fact for realize something of frosted glass in the real world it start to a common glass and with a superficial work of sandblasting or similar it create frosted glass, but internally the glass is common crown..the program is physically based and I though that the sphere must have been like in the reality

[B.Y.O.B.]

now I explain you because I put glass2 in the inner layer, in fact for realize something of frosted glass in the real world it start to a common glass and with a superficial work of sandblasting or similar it create frosted glass, but internally the glass is common crown..

Er - yes. But since only the surface is sandblasted, a filled sphere with roughglass material is perfectly physically correct.

[giuliettanice]

This is the result: I joined the two layer of the sphere..the inner sphere is glass2 with clear for exterior volume and world for internal volume, and the outer layer is glossy..but the reflection of the wall on the sphere is wrong..now I try to assign at the inner layer another type of the internal volume.
I don't understand very well, you say to assign rough glass for the inner layer?

[giuliettanice]

Sorry I'm wrong, this result is so if I put, to the inner layer, frosted glass at the external volume not clear sorry..I'm wrong to write sorry