nParticle shading attributes

Complex UV Layout in Maya

Over the last couple of years UV layout in Maya has changed for the better. In this course we're going to be taking a look at some of those changes as we UV map an entire character

Watch

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

EduSciVis-er
Join Date: Dec 2005

Location: Toronto

Posts: 3,374

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

Website - Blog - YouTube - Vimeo - Facebook - Twitter

-->How to Effectively Ask Questions on Forums<--

Quote

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

The thin red line
Join Date: Aug 2009

Location: England

Posts: 4,472

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

Avatar Challenge Winner 2010

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

Quote

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

EduSciVis-er
Join Date: Dec 2005

Location: Toronto

Posts: 3,374

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

Website - Blog - YouTube - Vimeo - Facebook - Twitter

-->How to Effectively Ask Questions on Forums<--

Quote

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

The thin red line
Join Date: Aug 2009

Location: England

Posts: 4,472

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

Avatar Challenge Winner 2010

Quote

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

EduSciVis-er
Join Date: Dec 2005

Location: Toronto

Posts: 3,374

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

-stwert

Website - Blog - YouTube - Vimeo - Facebook - Twitter

-->How to Effectively Ask Questions on Forums<--

Quote

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

Super Moderator
Join Date: Dec 2006

Location: South FL

Posts: 3,522

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.

Attached Thumbnails