Here is the Tenth example of the next release of PortablE:
Example 10: StarsZYX.e

Some A500 demos did more than just zooming straight into stars, they actually moved around inside them (in 3 dimensions).  After some thinking, I realised I could use a trick from StarsXY.e to do this with my StarsZ.e code.

This example shows stars moving out of the screen, while also moving across the screen, in 108 lines of E code.  It could however do any movement within the star field, by just changing how x/y/zOrigin are updated.