Doubts about glass materials

[SurfingAlien]

great info here guys... stored for future reference
thank you!

[Proupin]

Hi kubo!

Attached is what I came up with. The stencil is just between a glass with thickness. Something very important imho, is to set the IOR to near 1, in my example I set it to 1.01. The minuscule thickness this would have basically translates to no refraction... the refraction gets multiplied by the noise in fact, if you know what I mean.

The stencil is geometry, no opacity map used.

suerte

[kubo]

looks really good Proupin, nothing beats geometry, but I'm afraid there would be lot's of polys so I'll stick to the texture option.
Thanks for the setup thou, I'll keep it for future reference.

[Proupin]

(I didn't notice you posted those renders )

looks really good Proupin, nothing beats geometry, but I'm afraid there would be lot's of polys so I'll stick to the texture option.

If I were to opacity map the flake the material would look the same! (I only mentioned it to point it out)

I wonder why is your material diffuse? that looks nothing like the links you showed us.

[kubo]

its the laminated film inside the glass the one that's diffuse, when specular it looks like the first set, if diffuse it looks like the last one, wich is closer to home, in that case the opacity is half way if opacity was up to 1 it would be closer to the first example, and half way or lower is closer to last one, not treated glass like frosted but a laminated glass with a film (butyral or PVB or PVA) inside.
Yet I don't know why reflectiveness is acting weird upon oblique shots of glass.

[Proupin]

That glancing angle acts and looks very weird yes... you know, lucky accidents lead to great discoveries, if you can call a bug "great", neither feel "lucky" about unveiling it

[sam75]

Thanks a lot mate, not only for the time to anwser but also taking the time to make a test scene.
That's what I was looking for, the one you've made is a frosted glass (I'll keep it in my head for future reference), I needed one with a noisless film so using yours as a base I've changed the film material from specular to diffuse and that was just it, perfect, thanks a lot, you've solved my problem.
Also at first I was getting lots of fireflies, the bump map was set to 1 which can produce fireflies like there is no tomorrow, I've lowered to 0.1 or so, it still looks good but the images are free from those dammed fireflies.
Now the funny thing I can't figure out is why depending on the angle is totally specular and doesn't behave correctly you can see the different angles in the images, also on the back side no matter the angle everything looks good.
I've included the variant of the last image back in the pack.
Thanks for all the time, and for giving me a great solution.
Edit: @ Proupin, nope, more polygons are out of the question I need to save some memory for my hated trees, of which I might need several hundred copies... without instances is going to be a blast.... I might be doing 2 passes... don't know yet

no problem I am learning with you

[radiance]

a propper rough glass material would help here
it's high on our todo-list.

Radiance