[Mattia Sullini]

I know it is not phisycally correct, but it would be a must for keeping the polycount low on leaves, curtains....

[Bubbaloo]

Do you mean SSS for thin geometry? I agree.

[Mattia Sullini]

Right that.

[Maximus3D]

Yes please, this would be very useful. Plz NL code thin-sheet sss

/ Max

[Fernando Tella]

Well, SSS (subsurface scattering) obviously happens under the surface of the object. If it doesn't have volume it doesn't have any effect... I think that what you want can be achieved with some transmittance and high roughness...


Edit:I'm making some tests and I'm wrong with the transmittance part, but sss is working for planes...

Re-edit: Now I think I understand what you mean; if I'm not wrong, sss works now like if the plane had infinite volume, right? I guess we need something in material editor that tells the core: "Hey, treat the object's faces which has this material applyed as if each face is two sided (out-in and in-out) with a thickness of .... 0,01mm"

[Mattia Sullini]

I meant right that..
I tried almost the same things you did but as you have spotted by yourself the results were not predictable... are you joining to this wish, then?

[Fernando Tella]

Here are my tests:

Scene capture; the red box with the leaf is actually a 1cm thick box; the leaves are planar; box and leaves share the same material:


Render without SSS and transmittance rgb= 0,0,0:


Render without SSS and transmittance rgb= 0,3,0 (almost black very dark green):


Render with SSS and transmittance rgb= 0,3,0:


Render with SSS and transmittance rgb= 15,42,16 (dark green):


Render with SSS and transmittance rgb= 142,210,133 (very light green):


As we can see, Maxwell manages transmittance in planar objects as thickness=0 instead of infinite making them completely transparent with just a bit of transmittance, but with SSS it takes a planar as infinitely thick; we can see in the last one that the box renders as it should while the leaves of the palm scatters light a lot more.

are you joining to this wish, then?

Yes, I am. We need something in material editor to specify a "thin object thickness". A double sided option with thickness would be great.

[Mattia Sullini]

Thanks a lot for the tests! Really useful and effective in showing what i meant.

[Hybaj]

Indigo has this for some time. Just a link so you can learn more about this simple feature

http://www.indigorenderer.com/joomla/fo ... php?t=1856