Ground reflectance in HB+?

[mostapha]

@josh.greenfield

what is the preferred methodology for modeling ground reflectance in HB+? if I need to define a geometry that represents the “ground”, how far beyond the footprint of the building being analyzed does the ground geometry need to extend on all sides to accurately take into account the reflectance?

See this document. Page 358. 6.3.4: The Ground “Glow”: An “Upside-Down” Sky

This is how ground reflectance is implemented in Honeybee[+].

@josh.greenfield

Is there a pre-loaded set of materials that includes typical reflectance values for different exterior site conditions (grass, asphalt, concrete, etc.)?

There is no preloaded library but this should help: Ground Light in Daylight factor - #4 by giorgio_butturini