Using a render texture of camera output to set the alpha of particles in visual effect graph

Hiya,

I'm making a project in HDRP - which is a full screen interactive world map.

I've made city lights using the visual effect graph & a point cache / set position from map node.



Ideally, I would like the lights to fade out where the user is touching/clicking the screen.

I have a second camera that's outputting a render texture of the particle effects the user trails when touching/clicking the screen.


Is there a way of using this render texture to kill particles or fade the alpha in the visual effect graph?

Thanks!