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royterr
03-06-2009, 04:36 PM
When mapping ramps to the particles array attributes works good in the maya hardware render, it doesn't work with mental ray.
Whats the use of rendering particles in MR then, if one can not use a RGB pp ramp or an Opacity pp ramp together with MR?
leif3d
03-06-2009, 05:10 PM
Are you using Maya 2008? I believe pp attributes are not supported. I thought the same thing you did..."why the hell even support it if they're practically useless without pp attributes!?"

I just tested this in Maya 2009...and it also doesn't work! :argh: ...I assumed the fixed this...

Is there a workaround at least in 2009?
Cheesestraws
03-06-2009, 05:24 PM
It works perfectly with nParticles, I rendered this using mental ray.

http://img13.imageshack.us/img13/3334/dla.th.jpg (http://img13.imageshack.us/my.php?image=dla.jpg)
leif3d
03-06-2009, 05:30 PM
Just as you typed I realized I forgot to connect a particleSamplerInfo node RGBpp with the shader Color assignment of the particle.

it works fine :)
Cheesestraws
03-06-2009, 05:34 PM
Just as you typed I realized I forgot to connect a particleSamplerInfo node RGBpp with the shader Color assignment of the particle.

it works fine :)

Ahh, I have not played with normal particles in 2009 and it is all dealt with automagically with nParticles.
royterr
03-06-2009, 06:25 PM
Just as you typed I realized I forgot to connect a particleSamplerInfo node RGBpp with the shader Color assignment of the particle.

it works fine :)

can you give more details on how u did the connections plz?
leif3d
03-06-2009, 08:32 PM
Give the particle an RGBpp attribute > Give it a random expression for color > Make a shader and assign it to the particle > make a particleSamplerInfo node and connect the RGBpp attribute to the RGB atrribute of the shader.
royterr
03-06-2009, 10:18 PM
Give the particle an RGBpp attribute > Give it a random expression for color > Make a shader and assign it to the particle > make a particleSamplerInfo node and connect the RGBpp attribute to the RGB atrribute of the shader.

Ok but what do i connect to the particle sample node before connecting it to the shader?
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03-06-2009, 10:18 PM
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