Slow OSM Translation + Solar Reflection in LBT 1.9

ladybug-tools
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1

Hey!

Just upgraded to LBT1.9 via the Pollination installer (1.65.10) from LBT 1.8 (1.57.4) and was looking forward to faster OSM translations + thanks for all the other updates!

However in a model with fairly heavy context shading (meshes of surrounding buildings + window reveals) and for maybe 60 rooms - pressing ‘run’ leads to a freeze up and no dialogue box to confirm which stage the simulation is at.

When the cmd pops up - the E+ simulation also seems to be a lot slower at working through the solar reflection factors. Any ideas on why this could be?

My plan is to work backwards in level of detail to see if it improves - however given simulation time seemed reasonable in 1.8 i’m wondering if something more fundamental has changed.

Thanks as always!
Leighton

2

I’m just going to answer my own post, apologies.
A massive noob moment by me.

Coming from a radiance daylight model I completely forgot how much detail it can handle with a good CPU/GPU.

I examined the polygon count from the meshing process and it was in the millions cumulatively. Turns out if you don’t inspect the geometry, and you find little secret hidden geometry hidden inside volumes on Rhino layers - you get into difficulties like this.

Note to future self:

  • Inspect and simplify your geometry for E+ always.
  • Mesh your geometry in Rhino and run PolygonCount
  • If it’s a massive number, use ReduceMesh untill it stops resembling the orginal geometry
  • If you can make simple surfaces from your context and it’s faster than the above; do that.

That is all.