Cluster function that extends styles.

[daRasmussen]

Example cluster function works but if you want to visualize difference by attribute, I way to do this is to create a style function that scales the radius based on the attribute value.

Example:
P | V
p0 | 1000
p1 | 100
p2 | 10

The scale factor could be calculated based on the bounding box or Windows Size of the objects.

[daRasmussen]