This procedural will render points as sprites.
It is important to note that sprites contain indirect references to SHOPs which are NOT automatically detected, and so the output driver must have the "SHOP References" parameter set to "Declare all SHOPS".
Object - This is the object which contains the sprites
Velocity - This is the name of the velocity attribute to be Attribute used for motion blur. The attribute must exist
Attributes - This pattern specifies which point attributes
NOTE: This procedural works best if no bounding box is specified in the interface