On Jan. 24, I updated Sparta to Rev.28.
A most big difference with Rev.27 is that Rev.28 can merge several point cloud.
In the past version of Sparta, user can move the point cloud or remove it by using remove brush. On the other hand, there were not a functionality for increasing the point.
But on this update, user will be able to do an addition of the point cloud by using merge functionality. You can creates the animation as with modeling process to iterate "Merge point cloud → Shave point by Remove Brush".
Download Sparta from spartaproject.com/