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Christopher Alden avatar image
Christopher Alden asked ·

Arnold Displacement & User Data Color node in Houdini

Hi there,


I've been following this tutorial on an Infection / Growth system within Houdini; and the teacher is using Redshift. I believe Arnold is capable of doing the same thing here, but essentially they are using a layered shader in Redshift to switch between two materials once an object gets displaced; in this case a displacement occurs and slowly encompasses the entire surface of the object, and the displacement is one texture while the non-displaced geometry is a different one.


I'm sure there is a simpler way to explain this, and the tutorial does a fantastic job, but I can not seem to get the arnold equivalent nodes to behave similarly to the Redshift ones.


Any guidance would be much appreciated!

shadershtoadisplacementhtoa arnold houdinilayer
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Stephen Blair avatar image
Stephen Blair answered ·

I did enough of the tutorial to move on to the shading.

The user data node gets the burn attribute.

I'm using layer_rgba and utility shaders (one with color=white and one with color=prims), but you would do the same thing with standard_surface and layer_shader.

pyro-layer.png


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Lee Griggs avatar image
Lee Griggs answered ·

The link for the tutorial is broken but I am guessing a ramp to the mix parameter of the mix_shader might do it?

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Stephen Blair avatar image Stephen Blair ♦♦ ·

@ https://www.youtube.com/watch?v=Q450hTAmysc

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Stephen Blair avatar image Stephen Blair ♦♦ Stephen Blair ♦♦ ·

I would say whatever is driving the displacement should drive the shading eg where there's zero disp, use one shader, where there's non-zero disp, use another shader.

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