Set ground floor

How can I let the program know where is the ground. seems like the building its floating in the air. I get a “Outdoor” reference on the ground plane.

Hi what I did is insert a surface at the bottom of the building at the horizontal x-y plan. And in the grasshopper interface, I use the create surface component to create the surface and assign properties to it but I only use it for Radiance analysis. Maybe there is other solutions to it.
There are some similar post about ground surface like this.

Hope that helps.

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