United3dArtists Archive

BlooMort · Post by **BlooMort** » 02 Jan 2010, 15:09

OK I downloaded the Yafaray engine and the Yafaray4ts and installed them.
Now I can render large images, but they are all greyscale.

becomes

Please help.
Thanks
Stanley.

LeonRegis · Post by **LeonRegis** » 02 Jan 2010, 17:19

It's because you need to use yafaray materials. That materials are from Lightworks? They won't work on yafa, the materials come with the installation pack, go to the site and see the instructions about materials.

HTH

bitkar · Post by **bitkar** » 27 May 2011, 09:59

iam just playing with yafaray aswell... is the "repaint material" working? I mean, can one object have two shaders/materials??
Because if I paint whole object with one yafaray shader/material, everything works fine. But if I paint parts of the same object with the repaint tool (object from bridge that had two LW materials) and change the two LW materials into two yafa materials, it renders grey shaded.

Is it bug? is the problem at my side? or its not just supported yet?

clintonman · Post by **clintonman** » 27 May 2011, 14:09

I think the script is limited to one material per mesh.

bitkar · Post by **bitkar** » 27 May 2011, 14:31

thanks... i wanted to be sure of it.

Anyway looks like yafaray4ts is kinda dead project by now. :(
As iam playing with it... its hell fast and good renderer. Some improvements would be very nice. As this multimaterial issue... or glass shader does not have any specular highlights (shines, roughness settings), not option to use fresnel or plain glass (but its not essential) and I think light reflected from colored glass should be also colored which does not happen (only refracted is colorized), dont know why. But its very nice thing indeed. Ppl should play with it and use it more, i think its underestimated.

clintonman · Post by **clintonman** » 28 May 2011, 22:02

Just finished an experimental version of yafaray4ts with multi-material support. Add it to your scene and give it a try...if you dare. Did I mention this is experimental? You can deactivate the multi-material support by unchecking the option in the setup tab.

bitkar · Post by **bitkar** » 30 May 2011, 10:45

wow, you really surprised me... I loaded up in the scene, used your version with the render button in the panel. Only things that doesnt work is bringing the internal viewer window and save settings button. But the horse.tga (what?? :D) is there and it seems to work. (btw even original version cant run the tga viewer, dont know why, but the internal window is better)

one more thing: Refracted light with red glass shader is colored red (that works) but dont you know why the reflected is not? It can be seen on refl. caustics.

thanks a bunch! yafaray is really cool, its worth using it.

: only two materials, top is a reflection, thats why its blue.

clintonman · Post by **clintonman** » 30 May 2011, 15:19

bitkar wrote:wow, you really surprised me... I loaded up in the scene, used your version with the render button in the panel. Only things that doesnt work is bringing the internal viewer window and save settings button. But the horse.tga (what?? ) is there and it seems to work. (btw even original version cant run the tga viewer, dont know why, but the internal window is better)

one more thing: Refracted light with red glass shader is colored red (that works) but dont you know why the reflected is not? It can be seen on refl. caustics.

thanks a bunch! yafaray is really cool, its worth using it.

horse_1.jpg

All 3 viewer options work for me as well as the save settings button. Maybe you should reinstall yafaray4ts from the original setup.exe file. That might at least fix the tga viewer.

bitkar · Post by **bitkar** » 02 Jun 2011, 09:52

anyone has an idea why the glass shader is so reflective?? it doesnt look good, but i dont see and reflection values. And it doesnt color the reflected light. Is the tS yafaglass shader wrong? I dont like the glass shader at all - its not working well, no reflection, shines and roughness settings there. But its a big shame, coz yafa can make very nice caustics very fast, but with this glass shader its unusable :(

clintonman · Post by **clintonman** » 02 Jun 2011, 14:07

It's possible that the glass does not do light reflections on it's own and needs to be combined with another material via blending. The current yafaray4ts doesn't do blend materials.

bitkar · Post by **bitkar** » 03 Jun 2011, 08:12

hm, iam not sure... http://www.yafaray.org/documentation/userguide/material"
look at this, i doubt this has been blended, coz it describes the shader itself only. The colored glass really looks colored well, altought the shape is different. Maybe I should try to reproduce the scene within tS.

bitkar · Post by **bitkar** » 03 Jun 2011, 11:25

i was making some testrenders today. Absorption made the glass colorfull as it should be (didnt worked recently, started after reinstall of yafa4ts). I have no clue what the values should be for the absorption, not even about which units are used, but around 50 its ok. Seting to 0 should make it compute physically based or what, but the result is not that good.

What i cant get right and is wrong:
1) reflection causics are still white no matter what
2) there is some fresnel effect on the glass. but the glass can either reflect or refract, not both in different ratios - no translation between refl and refr.
3) the mirroring is just too strong. its dependend on IOR but anyway its too strong
4) when absorption is on there is some black reflection, it cannot reflect enviromnent (background, IBL, HDRi map)

here is a testrender. Using light from background or not, doesnt matter(4). Notice the line (2), reflection caustics are not too noticables, but trust me, its white, not colored. But it can look very glassy from certain angles.

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