Vray Material Converting (diffusion: not fusion, but layers)

[Antimatter]

When converting materials with a color and diffusion channel from c4d to vray the converter is using fusion to combine both channels ... that seems to be fine ... BUT ... if you are using refractive GI, materials with fusion tend to cause white blotches or in a extreme matter your image will be rendered pure white with long rendertimes.

When that happens you have to search for fusion in all your materials ... and if you are working on a clothing store with hundrets of m² ... you got a lot of diffrent materials for all the diffrent clothes... actually it's a pain in the a..

So please stop using fusion in the material converter and use the layer shader instead.

I had to write that down because i am fiddling around now for hours to find the one material ...

cheers,
Christian

[JorgeArango]

I agree that using layers is a simpler approach than fusion. Especially if the shader was made by someone else.

Layers is straightforward as you see all layers at once.


My opinion anyway.


Jorge Arango

[Tong]

+1

[Antimatter]

Sorry that i post this in the wrong forum ... i did not knew where to post because fusion causing errors seems to be a bug. :oops:

The effect is similar to lumas in specular + spec trans channel.
The area in the near will all turn into 100% white or you got white
splotches all around.

That always made me screaming like a little girl in a rollercoaster.
Please stop me screaming like that ... my neighbours will thank you for shure ;)

[stefan]

can you give us an example where fusion or lumas makes errors?

in my test both work.
with lumas you have to use lower intesities than in ar as the vray light intesities are way stronger. maybe it is that you refer to.

cheers
stefan

p.s yes i ask daniele if we could use layers in the material converison. i too think that would be nicer.

[Antimatter]

Hi Stefan thanks for the reply,

i could not recreate the fusion-problem but the lumas one
in a simple scene i could post.

With activated specularchannel in the "schwarzstahl" material
the scene is overlit to nearly pure white.

If you deactivate the specular channel the problem is gone.
There is no glossy effect or reflective GI activated, that could cause
these bright areas.

I will try to recreate or get an old scene with the fusion problem
similar to this one next week.

Here is the lumas problem-scene:

http://www.art-3d.com/vray/lumaserror.rar

[stefan]

i have seberal lumas materials for me that work nice.
but i will look into your file.

have you set the lightness of lumes lower( like 1/35) to have not the overbright intensity? your descripton look very muhc like you have it set to strong. lumas needs a bit other setting for vray.

any way with anisotropy you can make much nicer lumas like effects, they are also real and not fakes like lumas:-)

cheers
stefan