Q: When I run the photometrics calculation for an area, the foot-candle data points are more condensed/spread out than they should be, or the calculations take a long time to complete. What would cause that?
A: This usually happens when the base unit for the calculation is not set correctly. In the Calculate Photometrics dialog box, the Distance Unit field can be set to Inch, Foot, Millimeter, Centimeter, or Meter. This setting must match the base unit for your drawing.
When both the drawing and the calculation use the same base unit, the results are as expected. In the example shown below, the grid spacing for the calculation area is set to 10 feet and the data points appear every 10 feet.
If Distance Unit is set to a larger unit, such as Foot, but your drawing is measured in a smaller unit, such as inches, the data points will be too condensed, as shown below. In this example, the grid spacing is set to 10 feet, but because DM is treating each unit as being 12 times larger, data points appear every 10 inches.
If Distance Unit is set to a smaller unit, such as Inch, but your drawing in a larger unit, such as feet, the data points will be too spread out, as shown below. In this example, the grid spacing is set to 10 feet, but because DM is treating each unit as being 12 times smaller, data points appear every 120 feet.
If you’re not sure which base unit your drawing uses, you can find out using standard CAD commands:
Use the distance measured to determine the base unit for your drawing. The following list uses the approximate width of a door as an example:
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