I have a project with multiple layers.
The purple dots are from a pointfile with the symbology-expression:
z($geometry)> '14.5'. (so it only displays a purple dot when the Z-value is more than 14.5m).
I have a second layer with polygons, visible as the partly-transparent arc-area in red.
The next step i want to make in my project is to: have the purple dots appear only if: z($geometry)>'14.5' AND the x-y of that spot is within the geographical extent of the polygon from the second layer
What step do i have to take to get this done.