Does v-ray support modo's SSS ?

[weswait]

Trying to rerender an old project to see how vRay handles its modo's materials. I have some lampshades that render fine in modo but in vRay they are flat and have no light and volume. What do I need to do to get them look like this?

[John_Do]

Try the V-ray 2-Sided Material One side with your lampshade material, the other one with no material is a good starting point. You can tweak the translucency with the color or with a texture.

[weswait]

thanks! for the insight.

[vladimir.nedev]

There is an example of a 2-sided leaf material here : http://forums.chaosgroup.com/showthr...772#post651772
I think a lampshade is something similar.

Greetings,
Vladimir Nedev

[weswait]

Thanks Vladimir, I take a look at this scene.

[weswait]

Vladimir,

I got it to work. And at looking at the leaf scene I do not understand how it is using the image maps imported into the scene.

The leaf material says the front and back material is a mtl front or back leaf but the listed images imported into the scene are: mapleleaf_autumn_back2.jpg,mapleleaf_autumn_diff.j pg, mapleleaf_op.jpg, mapleleaf_spec.jpg, mapleleaf_veins.jpg. How are these images being utilized in modo as the material only has the V-Ray 2-Sided Material in it?

Where is this "mtl leaf front" and back its referenced to?

[GidPDX]

Wes, look in schematic- there you'll see how it's hooked up with nodes. You could do the same with several materials that sit under the 2sided in the shader tree in their own layers, probably with the maps over each material and set to drive the proper channel AFAIK.

[GidPDX]

I think this material kind of needs to be streamlined a bit more- or a more "uber" version of what is shown in the schematic wrapped up into one node for use in the ST- right now it's kind of clunky IMHO. Probably just have drop downs for each channel, or have it able to respect some flow in the ST more, maybe using libraries to reference front/back materials?

It seems the problem is that the double sided translucency material will not read any maps driving your front and back material in the shader tree. It just takes what the initial values of the material, and passes those forward instead of evaluating what the shader tree is putting into them, and then passing that forward.

So anything driving the diffuse, opacity etc. channels for the back and front materials via the ST are totally ignored by the 2 sided material.


If it would evaluate AFTER then we'd be able to get it to work. All the channels still work on the base material, but again, they are being taken before anything driving them is. I'd consider this a bug unless I'm doing something wrong. Working from the bottom up in the ST you'd expect these to be read correctly, just like they are for other materials etc. I know this 2 sided material is kind of different, but it makes no sense why it works with the schematic and not the shader tree other than it's being forced to get those channels values after instead of before.

If the 2 sided material could be pointed at a group or a library it might be able to more easily get around this issue- but maybe it's not so hard to do anyway?

[vladimir.nedev]

If the 2 sided material could be pointed at a group

Yes, that's what I am going to implement eventually.
Then everything in that group, textures and materials will be used.

For now, you need to connect the textures of the sub-material in the Schematic.

Greetings,
Vladimir Nedev

[GidPDX]

Good to know and thanks Vladimir- the group idea sound ideal.