Arnold Points
Arnold can render particles as points, discs or quads. For each particle group you can specify if it'll be rendered as geometry or point.
For rendering, all Arnold points will use one material from first point-particle on the list. All point-particles will have the same material.
Enabled - If disabled, Arnold point rendering will be disabled for all particle groups.
Render Mode - It is possible to render particle as Disk, Sphere or Quad. The size of shape will be taken from particle size attribute.
Cast Shadows - Choose if shape will cast shadows to other objects.
Receive Shadows - Choose if shape will receive shadows from other objects.
Self Shadows - Choose if shape will receive its own shadow.
Min Pixel Width- Minimum shape size in pixels.
Visibility
Camera - Choose if shape will be visible to the camera.
Diffuse Transmit - Choose if shape will be visible to the diffuse transmission rays.
Specular Transmit - Choose if shape will be visible to the specular transmission rays.
Diffuse Reflect - Choose if shape will be visible to the diffuse reflection rays.
Specular Reflect - Choose if shape will be visible to the specular reflection rays.
Volume Scatter - Choose if shape will be visible to the volume scattering rays.
Subsurface Scatter - Choose if shape will be visible to the subsurface scattering rays.