DAYSIM is a validated daylighting analysis software that calculates the annual daylight availability in arbitrary buildings based on the RADIANCE backward raytracer. It uses the Lightswitch occupant behavior model to mimic occupant use of personal controls such as light switches and venetian blinds and to predict energy savings from automated lighting controls such as occupancy sensors and photocell controlled diming systems. For design explorations, DAYSIM calculates a series of climate-based daylighting metrics including daylight autonomy and useful daylight illuminance. DAYSIM can also be used to carry out an annual glare annalysis of daylit scenes using the daylight glare probability concept. DAYSIM automatically generates hourly schedules for occupancy, electric lighting loads and shading device status. These schedules can be directly coupled with popular thermal simulation programs such as TRNSYS, EnergyPlus, eQuest and Esp-r for an integrated lighting-thermal simulation. DAYSIM has been linked to a series of CAD environments including Rhinoceros, Autodesk-Ecotect and Google Sketch Up.
It's training package for the daylighting analysis features of Autodesk Ecotect.
It's a design tool for generating 3D structures by specifying a design grammar.
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