dark opacity

[ozzidora]

I've tried to obtain a "brilliant" and transparent material but if I use low opacity it disappeaers, mid opacity is too dark (material applied to front and back faces),
high opacity is unuseful.
See attach
thank you

[derei]

First of all, twilight sun and sky don't cast caustics for render presets other than Progressive10, second, using IoR=1, won't have any refraction, so it will behave like the surrounding environment, to have some "shine" on the surface, you need a IoR that's different from 1. And third, using Generic materials will cast dull surfaces, because the reflection curve is a very uniform one. If Transparent presets are not useful for you, you can try Twilight Library, or even make your own material in kerkythea and save it as library.

[Fletch]

I am sorry I do not understand what you are saying above "brilliant" could mean "shiny" or "reflective" I suppose?
If you are trying to make a thin glass material, use the Architectural Glass Template. Please see this:Subject: Reflections in Architectural Glass

If you show us some photographs of actual real-world materials you want to create we can tell you how to create them with Twilight. (probably very simple)

[ozzidora]

I need to reproduce a material like attached, I don't know the renderer used, I suppose V ray...
thank you

[Chris]

Are you sure that is even a render? It looks like a snapshot directly from SU.

snapshot.jpg (24.09 KiB) Viewed 8889 times

Or maybe it is a blend of a render and a sketchup snapshot?

blend.jpg (16.95 KiB) Viewed 8889 times

(The above is just a very simple render with a generic white material, 50% transparent multiplied against a 2D export of the exact same scene from SU).

[ozzidora]

Thank you Chris,
I don't think that it is a Sketchup "edge lines" image over a rendered image because I have
other images of the rendered model like attached. Sorry I can't send the complete image because it's under
copyright. The problem is to achieve a material color like a very thin sheet of white paper, the black edges
can be easily rendered in Twilight.

thank you again