Sun eye views in Revit using Dynamo and Crumple!

[@6rand0nhen9]

Great packages Gavin ! A lot of our models in AU are set to MGA north - perhaps needs another node to rotate the vectors by addition 1deg deviation to True North ?

[@AussieBIMGuru]

Yes if a project orientates itself to mga north then you would need to rotate the vectors. Most projects to my understanding use true north instead for shadows as otherwise revit graphical shadows themselves are incorrect. That or firms are playing the dangerous game of accepting that the 1-2 degrees does not matter... Another workaround is set up multiple norths or temporarily change true north to add grid declination when running this tool, but unfortunately revit does not understanf this well, its an awful program for georefrrencing generally. I do most of my analysis in rhino which has a correction factor you can add to the sun path or nodes usually to do more sensitive analysis, I find most architects are quite clueless about coordinates these days and see it as a 'bim thing'... hope not the same for other BIM managers experiencing out there.

[@alantze]

Works great in R24. Thanks Gavin!

[@AussieBIMGuru]

Thanks Alan, hope you're doing well - been a while!

[@harpcourt]

do you have an videos of BIM to FM ? I am currently working as an owners rep developing their program.

[@AussieBIMGuru]

It's not an area I get too involved in as clients are still quite behind in this space in Australia (most just take in drawings and use platform like archibus at best). This discussion may be helpful as a reference maybe; kzbin.info/www/bejne/pX7UeKJ9jN6drq8feature=shared

[@marcinosiecki4272]

May I ask which solar calculator is used to determine sun vectors? Ladybug uses NOAA as I remember.

[@AussieBIMGuru]

Ladybug does indeed. Unfortunately I've been unable to track down Revit's noted system but there is very slight discrepancies (almost unnoticable until you zoom in) sometimes. Whether this is NOAA with rounding (Revit is less precise than Rhino) or a different engine I'm unsure, but for high level solar analysis it generally is close enough in my experience to Gh/Epw near similar locations.