Grasshopper Docs

Community documentation for Grasshopper add-ons & plugins

00 | Honeybee
01 | Daylight | Material
02 | Daylight | Light Source
03 | Daylight | Recipes
04 | Daylight | Daylight
05 | Energy | Building Program
06 | Energy | Material | Construction
07 | Energy | Schedule
08 | Energy | Set Zone Properties
09 | Energy | HVACSystems
10 | Energy | Energy
11 | THERM
12 | Developers
13 | WIP

Analysis Recipie for Vertical Sky Component, which is typically used to evaluate daylight and sky access in urban areas.
The Vertical Sky Component (VSC) is described by the UK Building Research Establishment (BRE) as the ratio of the direct sky illuminance falling on the vertical wall at a reference point, to the simultaneous horizontal illuminance under an unobstructed sky [Littlefair, 1991]. It also states that the Standard CIE Overcast Sky model is to be used for the sky illuminance distribution. This means that the reference value for the VSC percentage is effectively the unobstructed horizontal sky component.
The calculation performed by this component comes from this discussion on the RADIANCE forum:


Test Points_testPointsTest pointsGoo
Pts VectorsptsVectors_Point vectorsGoo
Test MeshtestMesh_Script variable verticalSkyComponentGoo
Ad_ad_Number of ambient divisions. "The error in the Monte Carlo calculation of indirect illuminance will be inversely proportional to the square root of this number. A value of zero implies no indirect calculation."Goo
Uniform SkyuniformSky_Set to true to run the study under a CIE uniform sky. Default is set to cloudy skyGoo


Analysis RecipeanalysisRecipeRecipe for vertical sky componentGoo

Video Tutorials

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