Vray two sided material...multiply by front diffuse and translucency maps

[luisgamino2]

Hi

I'm playing with vray two sided material and i had never maped the translucency in all My life...!!! But then sudenly i was curious to try to map this option, i used the same diffuse that i had used for the same material but with color correction to desaturated the bitmap and i got a really amazing result in paper and kind of silk... What's going in on with this parámeter???!!! It looks more realistic than using just de gray values, in the videos in You tube chaos group just explain sometimes at a básic level... In a maya vídeo about 2 sided material You didnt explain that option and sometimes some people just want push the vray to get the Best results... Also multiply by front diffuse doesnt work with vray gpu and it gives a very amazing effect too with vray cpu... I would like to see a vídeo about this option or at least an explanation because Also You can have a Lot of fantástics effects with this option maped

VRay 5.1( the last hotfix) for sketchup

Thanks in advance
Best regards

[luisgamino2]

Well i didnt get any kind of effects it is almost the same using a maped texture than play with gray values... And Also what hapen when i use 2 sided material with a shalled geometry...??? I did an experiment with vray next and it was very very slow, but with amazing effects
thanks

[piotrus3333]

VRay2sidedMtl is ment for geo without volume. and translucency map is a color input, like diffuse.

[luisgamino2]

In vray 5 is useless two sided material with shelled geometry... Light cache takes forever... This should be improved because everything in life has thickness everything... A Lamp or a curtain have thickness... Even a leaf has thickness, if we can have both options 2 sided with shelled geometry and with out because almost all the trees come with single geometry but if we are rendering a Lamp that can be changed... And option to tick shelled geometry or single geometry... So we can avoid the sss material with a little bit of refraction... Thanks for the coment piotrus 3333

Vray 2 sided material needs an improvement especially for vray gpu!!!

Left side with shelled geometry and Also with translucency maped, right side simple geometry with translucency maped... Translucency map works very Nice with shelled geometry as You can see this in this example... Also this is with ipr, with production render and light cache + brute force, Will look really amazing

Also the reflections in wall and floor looks really amazing with the left side... I left the render just for a minute...

Thanks
The last one is in real life... No render... But single geometry doesnt get the right result...

[Muhammed_Hamed]

Thank for the feedback Luis,

I do understand your use case here and yes this kind of lighting gives crazy good results, I have done this exactly in the past.
In the next update of Vray GPU this workflow will be much faster to render(and easier to setup), you will be able to use translucency directly in the Vray material and have as good results. The new SSS model is based on RandomWalk(should be even better looking and more realistic than the 2-sided material)

Like what Marcin said, the Vray2sidedMtl is meant for geometry without volumes like leaves or paper. It will stay like that.

Best,

Muhammed

[luisgamino2]

Hi Muhhamed Hamed

Sounds great the next update for vray gpu, since My experiment multiply by front diffuse option gives the same result that vray 2 sided material with shelled geometry ( there is no need to change geometry just tick that option, but is not supported for vray gpu) right now Muhammed can i play with Fog scattering Even with just the hybrid option in gpu mode??? Does scattering fog in refraction option works for vray gpu at vray 5.1 for sketchup??, i remember an Adán Martin vídeo about vegetation and he used in that vídeo a translucency option with hybrid and a very bright diffuse and he got an amazing result with Fog scattering in hybrid mode can i use these option right now??? Or simply scattering fog like hybrid mode in genéric material doesnt work for vray gpu?? I know i have to wait for the new models like sss Wax and water volumétrics, but can i use just the hybrid mode... With gpu???

Thanks in advance

[luisgamino2]

I did a test and Even hybrid mode isnt working in gpu thats why i didnt get a nice tree result... Well i hope it doesnt take too much time, finally i understood that parámeter... Is so important for any kind of tree or vegetation material, Also is important for curtains and lamps... Ohh My god!!! The translucency property in a vray material is so important for vray two sided material...i'm in shock...!!! Is so usefull that option... Thats why sometimes My trees look like plástic in vray gpu, but then You change with cpu, and looks quite realistic!!!
Hybrid mode is very important too Muhammed, i finally understood that option, sss Wax model and volumétric water model are important too, each one is very usefull for a specific purpose
Thanks

[luisgamino2]

Just a feedback Muhammed please don't forget for vray gpu for sketchup an option called thin walled refraction for the translucency i remember Adán Martin asking Vlado for that option so he can still do his work as he used to do for example in vegetation materials, i use a Lot Adan Martin techniques, Also hdrs, luts, etc, he explains very well some vray materials and i would like to follow the same way for vray gpu for sketchup ( this option is already available for vray for 3d max and maya in cpu) and probably for a Lot of vray gpu users for sketchup, thanks again for your help and effort in this amazing adventure... Vray Gpu!!!

[Muhammed_Hamed]

don't forget for vray gpu for sketchup an option called thin walled refraction for the translucency

Thank you for all the feedback Luis, it is very helpful for us

Thin-walled option is already working in Vray GPU internally now, it will be part of the next update.

sss Wax model and volumétric water model are important too, each one is very usefull for a specific purpose

These old models are being replaced by the new translucency models, based on RandomWalk SSS. I have used both, the new models are much much better and easier to control(only 3 sliders, and doesn't need refractivity to work)
RandomWalk SSS is industry standard in Visual Effects, it gives much better results than the old models because it allows for multiple scattering of light inside your geometry(old translucency used only one scatter and faked the effect). I will show you some tests when I get a chance

Is so important for any kind of tree or vegetation material, Also is important for curtains and lamps

For vegetation you will use SSS + Thin walled in the new update, so everything is in one place in the standard material. And you can use 2-sided if you want different materials for front and backside of leaves (usually front side is more glossy)
There is no need for multiply by front diffuse in this case(this effect is not physically accurate)

You will be very happy with this upcoming update Luis, both translucency and Thin-walled are working internally now. This update should be ready soon

Hybrid mode is very important too Muhammed

The issue with Hybrid mode is that you need 6 different sliders to control it, it is not very user friendly. And it was very slow
The new translucency models are faster to setup and faster to render like what I explained above

Best,
Muhammed

[luisgamino2]

Ohh i see!!! That is great Muhammed, finally understood the new sss material, thanks again!!! I'm very happy with this new upcoming update!!!