POPS
Generating Points
PointGeneratorPOP allows us number of shapes as the source and distribute a number of points across the surface or volume of the shape.
Attributes
Attributes are numbers(single number,vectors) that are assigned to a point, vertex or primitive of geometry.
Point Attribute is float3 
Color Attribute is float4
TopToPOP
A TopToPop creates for each pixel in a TOP a point in the POP.