SDG allow you to create synthetic data. This is a work in progress project and I plan to continually add new features.

3D spheres : rotating(4D) or not.
Time support (4D datasets with XYZT)

To create a volume containing 3D points, simply initialize the class and use provided methods starting with ".add" to generate points.
You can show the spots in your volume using methods starting with ".show".
And you can export the data into a .csv file to work with the synthetic dataset.

You need to study the rotation of a cell through time. If so you could generate a rotating sphere to represent it.