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Vray equivalent for Rhino Decals?

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  • Vray equivalent for Rhino Decals?

    Hello everyone,

    I'm a new guy here in the forums. Been very happy with V-Ray For Rhino except one thing: decals.
    I work with products that I always insert labels on. These products have a fixed plate where I insert labels (stickers) that indicate the type of recyclable waste. In Rhino I can just select those plate layers and add decals (as a plane). Since V-Ray doesn't work with decals, I've tried V-Ray materials but they won't show properly. The tutorials and guides are mostly from previous versions from V-Ray for Rhino, where there are similar operations to maneuver with (just like if I use Rhino Rendering and Rhino Decals. I doubt these features have been removed from 3.6, so perhaps it's hidden OR just different.

    The stickers are in .PNG format and when using them as V-Ray materials, they're cropped or they fill the label layer with a slice of the original PNG. Is there a similar "decal widget" to change their sizes and adjust positions? Now I've had to render with Rhino Cycles since everything else would render with V-Ray but the labels. Doing this post-rendering in Photoshop is a lot of extra work and mostly my angles are not great for skewing and twisting those PNG-images.

    Most likely I'm just doing it wrong but any advice from you guys how to do this within V-Ray for Rhino? I've added a picture of my problem (and my label) but I can post more if needed.

    Thank you in advance!


  • #2
    Hello,

    We plan on supporting Rhino decals in the upcoming major release, V-Ray Next for Rhino, or an update shortly after.

    In V-Ray 3 you can achieve the same effect in a couple of ways:

    1.
    - create a material with 2 layers - one to serve as a base, another one on top for the decal image (alternatively use a Blend material).
    - set up the decal texture by turning off its tiling from the Texture Placement options:
    Click image for larger version  Name:	decal_workaround_01_color.jpg Views:	1 Size:	35.0 KB ID:	1015931

    - create a black&white image of the Diffuse texture in an image-editor of your choice, then load it in the Decal layer's Opacity slot
    - disable its tiling and make sure its default color is set to black. This will only work with Bitmap textures so don't slot it within a Color Correction texture or use procedurals

    Click image for larger version  Name:	decal_workaround_01_bw.jpg Views:	1 Size:	50.6 KB ID:	1015932

    - apply the material to an object and then use the Rhino mapping tools to position the decal. Make sure the UV dimensions are the same ratio as the image file's height and width

    Click image for larger version  Name:	decal_workaround_02.jpg Views:	1 Size:	211.7 KB ID:	1015933


    2.
    The other way to assign a decal would be to cut out a separate face with the same width to height ratio as the decal image, apply a material with the decal as Diffuse texture and set a mapping to fit the image onto that separate face

    Let me know if you have any further questions!

    Kind regards,
    Peter
    Last edited by Peter.Chaushev; 02-11-2018, 09:14 AM.
    Peter Chaushev
    V-Ray for SketchUp | V-Ray for Rhino | Product Specialist
    www.chaos.com

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