Thank you guys for your suuport and suggestions!
Even though I am not as much familiar with AoI or MM3D as I am with Wings3D, I'll try them.
At the moment there is no other choice for me since I have no knoledge in processinig data files... but it could be a challange for the future, never say never ...

You're right, I find out that SH3D and wings3d generate different normal directions: while in SH3D vertex normals are orthogonal to faces, in wings3d they spread out radially;
Also the amount of normals and faces is different.

This affercts somehow surface reflection and material refraction.

I ...

Emmanuel,
I'm back after more tests: I think that the bad rendering is due to the Obj export method of the modelling software I use (Wings3D).

On the left you can see your original lampshade and on the right the same object imported in wings3d and then re-exported as .obj.
I manteined the same mtl ...

Great!
Thank you so much.. sorry..I'm sitll learning.. [:)]

Emmanuel, could you please post the mtl assignments of your cylindrical lampshade? I'd like to compare it to mine.

Wow, that's quite similar to what I mean... I'll let you know my further steps..
In the meantime you can have a look at my poor result...


Thank you!

Emmanuel, thank you for your prompt reply!
Ok, I tried with d = 0.32 on a 20x20cm empty box (with 1mm thick walls) that I put in upside-down position on the floor of a dark room.

Inside the box I put a 10x10cm light source hanging at 10cm elevation.

Unfortuntely the resulting Q4 photo is still far ...

Hi everybody,
I’m an enthusiastic recent SH3D user.
First of all let me congratulate the developers team on sharing this excellent tool. [=D>]

I’m practicing with models and light and I’m trying to obtain a realistic rendering of a translucent lampshade.
I made some tests modifying Ni parameter in ...