The thickness of each vertex of a pointSet may be individually
adjusted. Initially all vertices of a pointSet have a randomly
given thickness which then changes continuously between the 0 and the
globalPointSize().
The maximal thickness is determined by the
global vertex size which may be changed in the material
inspector.
Showing of the black circle around each dot may be disabled
using menu Show->Vertex Outline.
BETA: In z-buffer mode some kind of motion blur is
shown.