SItoA translates ICE particle shapes to native Arnold shapes. The supported particle shapes are already documented here, but here’s a little more information about how they are translated.
|ICE Shape||Arnold Shape|
|Point||points (mode “disk”)|
|Rectangle||box (with 0 height)|
|Sphere||points (mode “sphere”)|
The Segment, Capsule, and Blob shapes are not supported. SItoA skips them and they are not translated into the Arnold scene source.