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Dade Orgeron avatar image
Dade Orgeron asked ·

How do I render trails from X-Particles with Arnold?

x-particlescurvessplinestrails
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Dade Orgeron avatar image
Dade Orgeron answered ·

There are a couple of different ways to render trails generated by X-Particles with Arnold, but the easiest way is by simply adding an Arnold Tag to the xpTrail Generator. By using an Arnold Tag, you get a good bit of creative control without having to deal with lots of complicated settings.

I’m going to assume you already know how to generate particles and trails with X-Particles as well as have a basic understanding of using Cinema 4D tags and Arnold materials. Here’s how I do it:

  1. Right-click the xpTrail you’ve created and add an Arnold Parameters tag.
  2. In the Arnold Parameter tag, you’ll find setting for both manipulating curves as well as a few of the usual settings for simply rendering objects with Arnold. These controls are pretty basic, but are usually all I need for creating the style I’m lookinga for. More detailed information on the controls can be found here: https://support.solidangle.com/display/AFMUG/Curves
  3. With the IPR window open, experiment with the settings. What’s really great is that you don’t need to re-simulate every time you make a change, since the changes only affect the rendered appearance of the curves and not the X-Particle system.
    1. Try experimenting with the Curve width scale. It’s really easy to shape your curves the way you want them.
    2. Add a texture to the curve. You can do some pretty surprising things with a texture added to the curve or simply make your curves more organic with subtle noise.

As this is a frequently asked question we have provided both the question and answer in this thread.


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Is it possible to randomize the color of each trail using X-Particles parameters? I've tried a bunch of stuff similar to you're demonstration here: https://answers.arnoldrenderer.com/questions/112/how-do-i-randomize-and-take-control-of-particle-co.html but haven't had any luck.

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Alexander Bodal avatar image
Alexander Bodal answered ·

Is it possible to randomize the color of each trail using X-Particles parameters? I've tried a bunch of stuff similar to you're demonstration here: https://answers.arnoldrenderer.com/questions/112/how-do-i-randomize-and-take-control-of-particle-co.html but haven't had any luck.

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Oliver Navarro Schroeder avatar image
Oliver Navarro Schroeder answered ·

@Dade Orgeron I am also trying to find a way to randomize trail-colours with an arnold shader. Any solution for that at hand?

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Peter Horvath avatar image
Peter Horvath answered ·

Sorry for the late answer. To randomize trail colours you can use the utility shader with uniform ID mode. Or enable Export IDs on the Arnold tag and read the ids via a user_data_int shader. The parameter name is curve_id. You can connect it to a random shader for instance.

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