Grasshopper

algorithmic modeling for Rhino

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Vertical Sky Component

Component Index > Honeybee > 03 | Daylight | Recipes > Vertical Sky Component

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: http://www.radiance-online.org/pipermail/radiance-general/2006-September/004017.html

Inputs

NameIDDescriptionType
_testPoints_testPointsTest pointsGoo
ptsVectors_ptsVectors_Point vectorsGoo
testMesh_testMesh_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
uniformSky_uniformSky_Set to true to run the study under a CIE uniform sky. Default is set to cloudy skyGoo

Outputs

NameIDDescriptionType
analysisRecipeanalysisRecipeRecipe for vertical sky componentGoo

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