nParticle shading attributes

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# 1 31-05-2013 , 08:28 PM

EduSciVis-er
Join Date: Dec 2005

Location: Toronto

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I must be losing it, as I can't figure this out. What kind of shading type or shader do you need for nParticles to respect the attributes in the shading tab? I tried with cloud (s/w) and nothing I changed in the shading tab affected the render (mental ray) and then I tried with spheres and a surface shader applied to the particles and again, nothing I change affects them.

Put another way, what is the proper way to render per particle attributes with mental ray? And ideally without being influenced by lights. (Use lighting is unchecked, but it's greyed out anyway).

-stwert

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# 2 31-05-2013 , 09:29 PM

The thin red line
Join Date: Aug 2009

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You are in the nparticalshape and gone down to shading?................dave

Edit: Im fighting with caustics and photons at the moment so know how you feel user added image

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Last edited by daverave; 31-05-2013 at 09:33 PM.

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# 3 31-05-2013 , 09:41 PM

EduSciVis-er
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Yep... the ramps such as opacity and color don't seem to do anything. I tried point, and I can't remember if they worked with points, but I don't want points.

-stwert

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# 4 31-05-2013 , 10:33 PM

The thin red line
Join Date: Aug 2009

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I think you have some thing wrong with your scene file Stwert as all these things work for me.............dave

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# 5 31-05-2013 , 10:47 PM

EduSciVis-er
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Hmm... so if you change the color in the attributes with cloud type selected, it uses the color in the shapenode?

-stwert

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# 6 01-06-2013 , 03:30 AM

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If you're trying to use a shader and control the attributes on that using pp data then you'll have to use the particleSamplerInfo utility node. In this case, I plugged it into the mia_material diffuse color. I'm using blobby surface type particles.

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