Houdini Particles with colors: keep colors in Maya

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Once I import my sparks particles from Houdini, they appear colored in the Maya viewport. BUT as soon as I render them, they're all white.
I'm using Arnold (or Maya Renderer).
What's the best Arnold material to render sparks?
What's the setting to keep Houdini's colors?
Thanks in advance,
Gz
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So I had to dig more to find the solution... Not easy!! Here's how I did it :

In Maya:
- Have Hou Engine installed
- Import asset hda
- Play, check if it works
- Create a light with menubar > arnold > light > sky dome. aiSkyDomeLight1. Attribute editor:
* Part "Sydomelight attributes":
¤ color = white
¤ intensity = 5
* Part Visibility:
¤ Camera = 0
- Create a cam and position it
- Select objet file1_1 and in the attribute editor > file1_1Shape >
* Part "Arnold" > radius multiplier > 0.1
* Part "Particle size" > only if needed : radius = 0.05.
- Check the render with menu bar > arnold > open arnold render view > button play / stop
- Go to Hypershade
* tab > aiStandardSurface
* Outliner : select file1_1
* aiStandardSurface : RMB > assign to selected objet
* aiStandardSurface : attribute editor : base > weight = 1, specular > weight = 0, geometry > opacity = 1
* TAB > particleSamplerInfo.
* particleSamplerInfo connect RGB PP in aiStandardSurface, input : base Color
- Check the render


However, I still have a question : I got back the colors from my Houdini particles, but NOT the Alpha. In Maya , with particleSamplerInfo , I tried to connect the "Opacity PP" to aiStandardSurface, inputs Opacity R, Opacity G, Opacity B. But it does not work, the render becomes all black, WHY?

Also, as I asked before, is aiStandardSurface the best material for Sparks particles?

Thanks!
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Hi there,

This would be best directed to Arnold support.
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