Things to keep in mind when analyzing daylighting in AGi32

Accurate daylight analysis requires using the correct surface designation for exterior, but not interior, surfaces.


The key to accurate daylight analysis using AGi32 is the assignment of the correct surface type designation to glazing and exterior surfaces. Interior surfaces require no special treatment. Daylighting calculations using AGi32 follow several important assumptions:

  • AGi32 considers the following daylight components: sunlight, skylight, and light reflected from a “virtual” ground plane.
  • Daylight can only be seen by an interior surface (interior of a room or object) after it has passed through a “daylight transition surface.” This is typically daylight transition glass.
  • All exterior surfaces must be classified as “daylight exterior surfaces” to accumulate daylight components.
  • “Daylight transition surfaces” will consider light reflected only from “daylight exterior surfaces.”
  • Daylight models must contain at least one “daylight transition surface” or “daylight exterior surface” in order to compute daylight component.
  • The virtual exterior ground surface is automatically assigned a reflectance of 18% (average reflectance of an exterior scene, by Eastman Kodak, circa 1904).  

With these ideas in mind, we can create any model, classify all exterior surfaces as “exterior daylight surfaces” and classify all glazing as “daylight transition glass.” All interior surfaces may remain single- or double-sided, as created using the room or object tools, or imported (imported surfaces become objects). 

Courtesy: AGI website (

No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Choosing controllers: PLCs, PACs, IPCs, DCS? What's best for your application?; Wireless trends; Design, integration; Manufacturing Day; Product Exclusive
Variable speed drives: Smooth, efficient, electrically quite motion control; Process control upgrades; Mobile intelligence; Product finalists: Vote now; Product Exclusives
Machine design tips: Pneumatic or electric; Software upgrades; Ethernet advantages; Additive manufacturing; Engineering Leaders; Product exclusives: PLC, HMI, IO
This article collection contains the 5 most referenced articles on improving the use of PID.
Learn how Industry 4.0 adds supply chain efficiency, optimizes pricing, improves quality, and more.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Cyber security cost-efficient for industrial control systems; Extracting full value from operational data; Managing cyber security risks
Drilling for Big Data: Managing the flow of information; Big data drilldown series: Challenge and opportunity; OT to IT: Creating a circle of improvement; Industry loses best workers, again
Pipeline vulnerabilities? Securing hydrocarbon transit; Predictive analytics hit the mainstream; Dirty pipelines decrease flow, production—pig your line; Ensuring pipeline physical and cyber security