8.5.1.3 Exitance

In practical terms, exitance The area density of the luminous flux leaving a surface. (M) may be calculated by multiplying the illuminance The area density of the luminous flux incident on a surface. on a surface by the reflectance The ratio of the flux actually reflected by a sample surface to that which would be reflected into the same reflected-beam geometry by an ideal, perfectly diffuse standard surface irradiated in exactly the same way as the sample. of that surface. The units of exitance The area density of the luminous flux leaving a surface. are lumens/square foot and lumens/square meter.

Visual can report exitance The area density of the luminous flux leaving a surface. by using Properties to change the Measurement Type and assign a Reflectance The ratio of the flux actually reflected by a sample surface to that which would be reflected into the same reflected-beam geometry by an ideal, perfectly diffuse standard surface irradiated in exactly the same way as the sample. to a Calculation Zone after it is created. Select the Calculation Zone, click the Measurement list in the Calculation panel Subdivision of the Ribbonbar menu system that group related commands using vertical dividers. in the Properties tab A user interface object found in the Ribbonbar or Sidebar comprised of graphic and text buttons grouped based on function. and select "Exitance The area density of the luminous flux leaving a surface.", then specify a Reflectance The ratio of the flux actually reflected by a sample surface to that which would be reflected into the same reflected-beam geometry by an ideal, perfectly diffuse standard surface irradiated in exactly the same way as the sample.. Right-click or press Enter to apply the changes. Visual will immediately apply the Reflectance The ratio of the flux actually reflected by a sample surface to that which would be reflected into the same reflected-beam geometry by an ideal, perfectly diffuse standard surface irradiated in exactly the same way as the sample. without recalculation.

Exitance The area density of the luminous flux leaving a surface. can be displayed in the Rendered Display Mode By selecting from the Display Menu on the Calculations tab A user interface object found in the Ribbonbar or Sidebar comprised of graphic and text buttons grouped based on function.. (This is not the same as the Display button on the Home tab A user interface object found in the Ribbonbar or Sidebar comprised of graphic and text buttons grouped based on function..)