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Can Iray Decal Node do Base Color only?

CrissieBCrissieB Posts: 195
in Technical Help (nuts n bolts)

Hi All,

I'd like to 'paint' on a textured wall. Could be graffiti on a brick wall, a painted logo on a stucco wall, whatever. I know I can use an Iray Decal Node to project an image but, so far as I can tell, it also projects its own Bump and/or Normal map onto the affected area. What I'd like to do is project ONLY a Base Color, leaving the underlying Bump and/or Normal maps in effect ... as if I were painting on the wall.

Is that possible with an Iray Decal Node?

Thanks, Crissie

Comments

  • Oso3DOso3D Posts: 15,006

    I don’t think so, but maybe consider using the diffuse overlay, instead?

    Set diffuse overlay to the color you want, and then ‘paint’ the image as the diffuse overlay weight (ie: mask).

  • CrissieBCrissieB Posts: 195

    Hi Oso,

    The problem is texel density. It's a detailed logo-mural, with lettering, etc. I tried including the logo-mural when I did the wall with Substance Painter and -- even with 4k maps for that material -- the logo-mural was visibly pixelated. I think I'd hit the same texel density problem using the LIE or a Diffuse Overlay map.

    The Iray Decal Node gives a nice, crisp logo-mural image and I masked it so the surrounding wall shows fine. But the Bump/Normal of the logo-mural doesn't match the wall.

    Crissie

  • Oso3DOso3D Posts: 15,006

    Then maybe use LIE to scale and move the mask.

    (I don’t otherwise think there is a way to do what you want)

  • CrissieBCrissieB Posts: 195

    Thanks, Oso!

    I'll try an LIE and see if it comes out as pixelated as it did when embedded in the texture map.

    Crissie

  • CrissieBCrissieB Posts: 195

    Hi Oso,

    Alas, as expected, the LIE had the same problem as when I embedded the logo-mural in the basic texture. Not enough pixel density for a clear logo-mural, even with a 4k texture. Ah well....

    Crissie

  • CrissieBCrissieB Posts: 195
    edited January 2018

    Well, part of the problem was simply that DAZ's default preview mode is much more pixelated than Iray mode. Even so, I had to go to an 8k texture for that room's walls, in order to get the logo-mural image clear.

    UPDATE: I was able to make it work on a 4k texture map by scaling up that wall on the UV map. That works for a texture like stucco, but it wouldn't for a brick or wood texture, where mortar lines or grains need to be the same size.

    Post edited by CrissieB on
  • lilweeplilweep Posts: 2,486

    by the way, i realise this is an old thread, but i did base colour only on an iray decay node by making it refractive and putting the color in either glossy or top coat color (uber shader)

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