Introduction to Maya - Rendering in Arnold
This course will look at the fundamentals of rendering in Arnold. We'll go through the different light types available, cameras, shaders, Arnold's render settings and finally how to split an image into render passes (AOV's), before we then reassemble it i
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24-03-2003
, 10:59 PM
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RAMPS ON PARTICLES
I need an idea of how to apply a ramp to a particle so that it becomes more transparent as it travels farther away from the emitter. Is this done in the properties or do I need a mel script for it?
Dave Baer
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida
dbaer@dmac.edu
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25-03-2003
, 01:31 PM
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This is done in the attribute editor by clicking the Opacity button under Add Dynamic Attributes.
From the dialog that pops up choose Add Per Particle Attribute.
Now you should see an opacityPP under the Per Particle (Array) Attributes section.
Right-click on the field next to it and choose Create Ramp. A text "<- arrayMapper1.outValuePP" appears in the field.
Right click on the text and choose "<- arrayMapper1.outValuePP -> Edit Ramp".
By default the ramp is a white to black (bottom to top) gradient and is driven by the particle's age. This means that at birth the particle is completely opaque and at death it's completely transparent. Edit the ramp and see what happens...
To add more randomness you might want to change the particles lifespan to Random Range and play with the settings.
I know this wasn't exactly what you asked but if you really want the opacityPP be driven by the distance travelled you'd need to write a per particle runtime expression which could get a bit involved (but not impossible)...
Hope this helps...
Last edited by kbrown; 25-03-2003 at 01:36 PM.
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25-03-2003
, 03:11 PM
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I remember that method. I used it in school, that's why I knew to add a ramp to the particle to make it fade. I just couldn't remember the method to do it. (getting old)...
Dave Baer
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida
dbaer@dmac.edu
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25-03-2003
, 03:54 PM
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Been out of town...
Great answers btw
Thanks!
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