Photometric Data Import
The Photometric Data Import node is only available in 3D.
It is also only available when Compute intensity, Compute intensity and power, Compute intensity in graded media, or Compute intensity and power in graded media is selected from the Intensity computation list in the physics interface Intensity Computation section.
Use the Photometric Data Import node to import photometric data files that can be used to initialize the ray intensity and power as a function of the initial ray direction. The Photometric Data Import node supports the *.ies file extension, the standard photometric data file format of the Illuminating Engineering Society of North America (IESNA).
Photometric Data Import
Enter a File name, or click the Browse button to locate a photometric data file. When a valid file path has been entered, click the Import button to load the photometric data into the model.
If photometric data has already been loaded by the Photometric Data Import feature, instead click the Discard button to discard this data and clear the File name field.
After creating an instance of the Photometric Data Import feature and loading an appropriately formatted IES file into the model, initialize the ray intensity as a function of initial ray direction by changing the following settings in a ray release feature such as the Release or Release from Grid feature:
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Select Spherical, Hemispherical, Conical, or Lambertian from the Ray direction vector list in the physics feature Ray Direction Vector section.
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Locate the Total Source Power section. From the Intensity initialization list, select an instance of the Photometric Data Import feature.
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Enter values or expressions for the Photometric horizontal and Photometric zero directions.
Photometric Data Formatting
The format of the imported photometric data file must be consistent with ANSI/IESNA LM-63-02 (R2008), IESNA Standard file format for the electronic transfer of photometric data and related information, Illuminating Engineering Society (2002).