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To render particles in Arnold for Houdini, Geometry Properties must be added on an OBJ containing points or particles. The properties relevant to point rendering are on the Shapes tab. Particles can be rendered as disks, spheres, quads or volumes.


When the Volume Step Size is set to a value above 0, the particle will be rendered as constant density volume spheres. You also need to connect a volume shader to OBJ to render properly. 

  • In the Shape tab of the Arnold properties (Tab > Arnold > Add Arnold Attributes), change the Step Size to a value greater than 0 and set the Points Mode to Sphere.



Points rendered as Quads with random radius, rotation, and aspect

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