The Calculate command is used to calculate the illuminance levels on the drawing based upon the light fixtures and solids that have been inserted.
To run photometric calculations, go to
Ribbon: DM Photometrics->Calculate-> 
Calculate
Pulldown Menu: DM Photometrics->Calculate
Calculate Photometrics Dialog Box
Contour Level 1 - 10: Enter the illuminance level at which to draw contours. You can have up to 10 contours. Contours set to 0 will not be drawn.
Layer or Color: Enter the layer or color of the contour. If the layer specified does not exist on the drawing, it will be created. Press the Set Color button to open the standard CAD Select Color dialog box.
Show Illuminance Levels and Contours: Select this option to show illuminance levels and contours on the drawing. The illuminance levels and contours will be displayed in the calculation area after the calculation is finished.
Show Illuminance Levels Only: Select this option to show illuminance levels on the drawing. The illuminance levels will be displayed in the calculation area after the calculation is finished.
Show Contours Only: Select this option to show contours on the drawing. The contours will be displayed in the calculation area after the calculation is finished.
Decimal Places on Drawing: The number of decimal places to include in the illuminance levels on the drawing.
Decimal Places in Schedule: The number of decimal places to include in the illuminance levels on the schedule. If the Decimal Places on Drawing is less than the Decimal Places in Schedule, the smaller Decimal Places on Drawing will be used for the Maximum Illuminance and the Minimum Illuminance values in the schedule.
Distance Unit: The base unit for your drawing. See the Base Units and Photometrics Calculations article in the knowledge base for more information about determining the correct Distance Unit setting for your drawing.
| • | Inch: One unit on the drawing corresponds to one inch. The standard base unit for US architectural drawings. |
| • | Foot: One unit on the drawing corresponds to one foot. The standard base unit for US civil drawings. |
| • | Millimeter: One unit on the drawing corresponds to one millimeter. |
| • | Centimeter: One unit on the drawing corresponds to one centimeter. |
| • | Meter: One unit on the drawing corresponds to one meter. |
Illuminance Unit: Whether the illuminance levels are displayed in foot-candles or lux.
Reflections: Whether the calculation includes reflections from walls.
| • | No Reflection: No reflections are included in the calculation. This option is faster, though the calculated values will be slightly lower than reality for inside calculations and near walls outside. |
| • | Single Reflection: Light is reflected once during the calculations. This option takes longer, but results in higher values near solids. The light is reflected off of one surface to the ground. Light that hits a second surface is not reflected. For example, light that goes from the light to a wall to the ground is included. Light that goes from the light to the floor to a wall, then back to the floor, is not included. |
Edit Title, Column Labels, and Column Order: Press these buttons to modify the layout of the photometric schedule for general calculation areas and general calculation lines on the drawing. See the Edit Calculation Schedule Layout section and Edit Calculation Line Schedule Layout section for more information.
Zoom to Schedule After Insertion: Whether the display will be moved to the schedule associated with the calculation area.
Calculating Photometrics
After all of the information has been entered, press the OK button.
If there is only one calculation area in the drawing, the illuminance levels in the area will be calculated.
If there is more than one calculation area in the drawing, you will be prompted to specify which area to calculate.
Select calculation area to calculate / <Calculate all boundaries>:
Select calculation area: Select a point inside an area to calculate the illuminance levels in just that area.
Calculate all boundaries: Press ENTER to calculate the illuminance levels in all areas on the drawing.
The illuminance levels and contours in the area that is calculated will be updated. The values in the corresponding photometric calculation schedule will also be updated.
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Schedule title justification: Sets the justification for the schedule title. Schedule column label justification: Sets the justification for column headings. Schedule title continued label: Sets the label added to the schedule title for continued sections. There are several options that set the default values for this dialog box. See the Photometric Calculations Options section for more information. |