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Iray - DS Default - Map Question

cosmo71cosmo71 Posts: 3,609
in The Commons

Hello, I have a question on maps, I have a product bought that has Iray Textures only, I have changed the Iray shader to the DS default shader, no problem so far the only thing I want to know is if the Roughness map (Iray) is the bump map (DS default) or is it the Displacement map?

Comments

  • mjc1016mjc1016 Posts: 15,001

    Neither...both...either...

    None of the 3Delight shaders that are commonly used in Studio, especially the default, use the roughness map, so it's a 'spare'.  Yes, it can be plugged in to somewhere else, but it's not really optimal for bump or displacement, even though it can (but it's not really any less optimal than the typical desaturated diffuse maps that are commonly used for bump/displacement in Studio).

  • fixmypcmikefixmypcmike Posts: 19,685

    I thought Roughness was more akin to the inverse of Glossiness.

  • cosmo71cosmo71 Posts: 3,609
    Fixmypcmike said:

    I thought Roughness was more akin to the inverse of Glossiness.

    I do not know that is why I was asking

  • cosmo71cosmo71 Posts: 3,609

    I am still a 3Delight addict

  • fixmypcmikefixmypcmike Posts: 19,685

    So am I, 3Delight lights and surfaces make sense to me.  I imagine for people with a background in real-world lighting (photography, cinematography, stage lighting, etc.) Iray is much more intuitive, but for me it isn't.

  • mjc1016mjc1016 Posts: 15,001

    It is...sort of.  But it doesn't make a good specular map.

    Glossiness, in 3DL terms works at 'macro' scale...roughness (in both 3DL and Iray) is at a 'micro' scale, except none of the common shaders use the roughness parameter.

  • ArtiniArtini Posts: 10,306
    edited May 2016

    The other possibility is to test the map. I have just made a simple scene and rendered in Daz Studio with iray.

    image

    Rough01pic04.jpg
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    Post edited by Artini on
  • ArtiniArtini Posts: 10,306
    edited May 2016

    Then I have attached the simple map to the Diffuse Roughness channell to all objects

    and rendered it again in Daz Studio with iray. Rendering time was 15% shorter than before.

    image

    image

    Noise01.jpg
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    Rough01Diffuse01pic01.jpg
    800 x 1024 - 143K
    scene01plane.jpg
    409 x 217 - 27K
    Post edited by Artini on
  • ArtiniArtini Posts: 10,306
    edited May 2016

    I could not find the roughness in 3Delight (DS default). Where did you found it?

    imageimage

    a3DLdefault.jpg
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    a3DLdefaultMetallic.jpg
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    Post edited by Artini on
  • Oso3DOso3D Posts: 15,085

    Glossiness and Roughness are inverses. If you want to plug in a roughness into 3DL basic DS shader, put it in Glossiness and use LIE to invert the image.

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