How to place single GPU particles at specified locations?

Trying to get it working

@: I attempted to implement the updated method from your most recent post. But I’m not getting anything displayed.

I imagine (I hope!) there must be something obvious that I missed. I wonder if you or anyone would like to take a look at my project and advise?

Here is the work in progress. To try it out you can either clone it with Git or just download the zip file.

Thanks!