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Omri hair is white in iray

Kev914Kev914 Posts: 1,126
in The Commons

I was using the Travis figure with the Omri hair but if I render in iRay, the hair is almost all white. I think there might be a few darker specks in it. Can't remember for certain. I tried messing with a few of the shader settings, but it still rendered mostly white. So why does it do this and how can I figure it. The same hair looks fine if I render in 3delight renderer.

Also does anybody know what hair that they use for Travis in the promo pictures? He is in the bundle for Darius. I like that hair, but I don't think I have it.

Using this figure in 3delight (not sure if that's the right name but you'll know what I mean) has been interesting too.

I created a scene. Test rendered it. It looked OK. Went back later in the day and worked on it some more. Did a test render and everything was OK. Except for Travis' legs. They were white between the knees and the feet. I fixed it by re-applying the textures. Next day I decided to change a few more things. This time when I rendered Travis was completely white...a flat sort of white. His hair and his shorts were textured but he was not. Also there was a shirt on the bench and it was all white too. Everything else in the scene was OK. I ended up shutting DS down without saving, But when I reopened, they were still white. I had to re-apply the textures to fix it again. Why does this happen?

Comments

  • jakibluejakiblue Posts: 7,281

    Omri hair rendering white in iray - are you adding any iray lights or just using the hdri environment? It's something to do wiht backscattering - I'm not sure what, but there are a couple of threads on it in the forum. If you add lights, it should render normal. 

  • AprilYSHAprilYSH Posts: 1,522
    edited July 2017

    Heya, this is due to incorrect gamma.  Previous to Iray the 3delight render had gamma correction off so most of us generally ignored gamma settings, but then the Iray render settings defaulted to gamma 2.2! This is the issue with Omri hair as it was pre-Iray. :(  To fix it, whether or not you apply the Iray uber shader, adjust the hair diffuse map gamma to 0 which tells it to match the render setting.  

    Click the image below and follow the steps.  :)  

    I hope it helps in case you run into other pre-Iray items like this!

    gamma-fix.jpg
    1707 x 540 - 170K
    Post edited by AprilYSH on
  • SpottedKittySpottedKitty Posts: 7,232
    KevinH said:

    So why does it do this and how can I figure it. The same hair looks fine if I render in 3delight renderer.

    You just gave yourself the answer — Omri hair doesn't have Iray texture settings, it has 3Delight ones. I have the UHT Hair Shaders, and applying them to Omri looks good in all my test renders, although simply applying the Iray Uber Base shader works fairly well.

  • jakibluejakiblue Posts: 7,281

    oh gosh, I didn't even stop to think about Omri coming out BEFORE iray :blush: 

    Good think April saw the thread LOL

  • Oso3DOso3D Posts: 15,085

    It's funny, because Omri's design makes it one of the best hairs for Iray I've seen. ;)

  • Kev914Kev914 Posts: 1,126

    Thanks for the help.

    And thanks AprilYSH for the details instructions on how to fix it. I have a lot of your products.

  • xyer0xyer0 Posts: 6,325
    edited February 2017

    A year on, and still helping Daz people.

    I also had to lower the base colour and glossy to get a natural look.

    Post edited by xyer0 on
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