Material for Curtain

[dgraphics]

Hi

In 3dsmax for the curtain I used material like vray2SidedMtl but now with Modo what can I do?

Can you help me?

sorry but i'm lost

thank's

Daniele

[BVA]

HI Daniele

Very good question, I am having the same problem.
I had some success with a modo material and just adding the sss... but that is also scene dependant. (What worked in one scene doesn't work for the next)

If you get a good way please post it here

Regards
Barend

[vladimir.nedev]

We will be adding the VRay2SidedMtl soon, the materials for front/back faces will be connected using the Schematic view-port in MODO.

We don't support SSS on MODO's own material at the moment. You can use V-Ray Fast SSS2 to achieve a translucency effect like in a 2-sided
material, but you will need to add thickness to the curtain geometry. And it will probably be slower compared to the 2-sided material.

Greetings,
Vladimir Nedev

[BVA]

Hi Vladimir

That is probably why I didn't get it to work on all the projects...I must have done it on a modo job then tried on vray and not working
Thanks for pointing it out

[kubbek]

Hi

In 3dsmax for the curtain I used material like vray2SidedMtl but now with Modo what can I do?

Can you help me?

sorry but i'm lost

thank's

Daniele

If you need it now I found a hacky way to make 2sided like material with V-Ray for modo. It uses backfacing gradient to control visibility and shader blending to control level of translucency. Material has to be placed above main shader in shader tree.

Biggest downside - it uses duplicated geometry that has to be flipped and moved a little bit.

Here modo scene:https://dl.dropboxusercontent.com/u/...sided_hack.lxo

And example render :

[vmodo]

Hi Vladimir
Does MODOs API allow to have “VRay2SidedMtl” “VrayBlendMaterial” or “VRayMultiSubTex” as a Group-Mask Effect inside the Shader Tree?
It would be a more convenient workflow that to switch between the Shader Tree and the Schematic View.

Example:

[vladimir.nedev]

It can probably be done is some hacky way. But I fear it will completely change the rules of how the shader tree works.
Which will make it even more confusing to figure out what is supposed to happen.

The shader tree works in a bottom to top fashion. With each layer modifying a fixed set of properties (diffuse color, reflection color, bump, displacement, etc.)
until a Shader item is reached and all reflected light is computed. If more Shader items are encountered going towards the top, they are all blended together
like a VRayBlendMtl ( unless of course the Shader item on top has an opacity of 100% and "Normal" blend mode, in which case it just completely overrides the Shader
below it).

In your screen-shot the direction seems to be reversed. What happens if one of the groups marked as "Front" or "Back" is not allowing the particular item that is being shaded
to pass through it ? What happens if you have a group marked as "Front" or "Back" that isn't inside a group marked as "VRay2SidedMtl"? Do these get blended with other
materials marked as "Front" or "Back" below them ?

If we add this it will be a completely new way to think about the operation of the shader tree. I prefer to start with the simpler approach of making these materials
work in the Schematic and maybe add what you propose (or something along those lines) at some later stage.

Greetings,
Vladimir Nedev

[vmodo]

I see your concerns - are familiar with the process to set up a two-sited material with the modo-renderer?
because you would run into the same problems you illustrating here.

In Modo you do a two-sited material with a gradient (surface parameters: Back Facing) and the Effect is “Group Mask”
The Color or Value at the 0% position shades the front of the polygon, while the Color or Value at the 100% position
shades the opposite side of the polygon.



Online Documentation:
http://docs.luxology.com/modo/801/he...ng#page=page-8

[vladimir.nedev]

Yes, this example should work with V-Ray. But it still works within the normal operation of the shader tree.
The channel values for these two materials are blended together as separate channels based on the group mask, and then the Shader item
computes the lighting for the blended values.

The 2Sided and blend materials in V-Ray don't work like this. I don't think there is an exact equivalent of the 2Sided material
in MODO.

Greetings,
Vladimir Nedev

[talleman]

I don't know if it is exactly what you are looking for, but I have used the translucency (hybrid) for this. I can't remember if I had to give my curtains thickness or not though.

Renders fast enough. This is no replacement for the 2 sided material, but it works for now.

[dgraphics]

Hi

I have now this questions, what is a very good work around for to have a very good material for curtain in modo like 2side material of 3dsmax ?


Thank's


Daniele

P.S. V-Ray Fast SSS2 ? but not is the same of 2side material

[vladimir.nedev]

You can try the trick with the "back facing" input for a gradient texture that vmodo mentioned.
Or you can try the Fast SSS2 material, but the geometry needs to have thickness.
There isn't an exact replacement for the 2sided material though.

Greetings,
Vladimir Nedev

[dgraphics]

Can you post modo scene like example

Thank's
Daniele

[vladimir.nedev]

Sorry, didn't have time to come up with an example. The nightly build from 2015-02-07 will have the 2-Sided material (it will also be part of the next open beta build - 3.00.05).
The connections to the 2-sided material are made using the Schematic. The textures of the front and back materials need to be connected to them using the Schematic as well
(the front/back materials will ignore the shader tree, we may come up with some way to take the shader tree into account later on).

Here is an example :

And the scene : 2sided_example.zip

Greetings,
Vladimir Nedev

[kubbek]

Great! I have been waiting for it!