Hi Magnus,
At my laptop now and this is what I mean.
GH script: IncidentRadiationHOY.gh (51.1 KB)
This does create a new sky matrix for every hour, but as it is only for a single hour it’s very quick, 146ms.
You can vary your input hour here:
GH script: IncidentRadiationHOY.gh (51.1 KB)
