Prepare an AGi32 Model

Make sure the LAI Weather Database is installed

The LAI Weather Database is NOT installed by default when installing AGi32. It is a separate download and installation process. If you have already been performing daylight calculations in AGi32 using the Perez Sky, you will have installed it previously. Here are the instructions for downloading and installing the weather database when using AGi32.

Easiest: Click on the Daylight button, which opens the Daylight Parameters dialog. Click on the Sites button. A pop-up message will ask if you would like to download the Weather Stations Database. Select Yes, and then follow the prompts to complete the download and installation. It will take about 5-10 minutes altogether, depending on your computer speed and Internet connection. The download file is 156 MB. After installation, it will be expanded to approximately 1 GB.

Alternative: You may also download the weather database from our website. Follow all the prompts to download and install the Weather Station Database in the location that the installer suggests; that is where AGi32 will look for it.

More about the LAI Weather Database

Set the site location and orientation

  1. Open the Daylight command in AGi32 from the toolbar.
  2. Select the checkbox to Enable Daylighting.
  3. Click the Sites button to locate a specific site by its weather station, or simply enter the Latitude and Longitude in the cells provided. You can save your site definitions so they appear in the pull-down menu.

  1. Set the True north orientation of the model in degrees according to the CCE (Counter clockwise East) system (0 is East, 90 is North, etc.) If you prefer to set the orientation graphically you can do so from the Set North button.
  2. Select the Perez All-Weather Sky and find the closest weather station to your site location.

  1. Place windows, skylights or openings and include a "transition surface" to capture the daylight. Do this using the AGi32 command to Cut Opening in a Room or Object (usually a Room). Be sure and include a Transition Surface when the command prompts you to do so, and set the transmittance by clicking on the Surface Edit button in the dialog.
  2. If you are using other objects, either imported or otherwise, set the surface type to "Daylight transition...". This is an automatic setting when performing the previous step if accepted.
    1. Set the transparency (Fresnel) or transmittance (diffuse) for the transition surface.
    1. Make sure the transition surfaces faces inward (winkies face in). This can be adjusted in Surface Edit.

  1. Calculation points are required to run an annual simulation. Place calculation points on the appropriate work planes or surfaces at the necessary spacing. IES LM-83-14 requires points 2' on center on a 2.5' workplane. Do not use a larger spacing as this affects the location of the daylight meters and subsequent accuracy of the calculations.

  1. Select the Annual Daylight Simulation command from the Daylight drop-down menu.