Calculation objects

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Calculation objects

Calculation objects


Here you can position additional calculation objects and set their calculation parameters. You can position the new calculation object in the scene using the mouse and "drag & drop" or you can draw it as a rectangular or polygonal object directly in the scene. You can define the type of calculation object as usual via "Select".

You allot individual calculation parameters to each calculation object.

Calculation objects - perpendicular illuminance as the default

The following options are available for calculation areas:

  • perpendicular illuminance adaptive. The value to be determined is not defined on a fixed grid but dynamically in the positions where relevant changes take place.
  • vertical illuminance
  • UGR (Unified Glare Rating)
  • GR (Glare Rating)
  • cylindrical illuminance
  • semi-cylindrical illuminance
  • hemispehric illuminance
  • camera-oriented illuminance. For this a camera must be in place.
  • Daylight quotient/ratio
  • free calculation direction



For calculation points the parameters are:

  • horizontal illuminance
  • vertical illuminance
  • UGR (Unified Glare Rating)
  • GR (Glare Rating)
  • cylindrical illuminance
  • semi-cylindrical illuminance
  • hemispheric illuminance
  • daylight quotient/ratio
  • free calculation direction


For some of the parameters it is possible to set further data e.g. height offset or viewing angle.

For calculation areas you set whether the measuring matrix settings should be automatic, with a fixed number of points or with fixed intervals.

It is not necessary to position a new calculation object 
for each type of calculation parameter.
An object can identify , for example, not only the horizontal
but also the cylindrical illuminance.

Visual task areas

Visual task area



With this tool it is possible to set the visual task area in which the current visual task is carried out according to DIN EN-12464-1.Draw the task area as a rectangle or polygon in your CAD window. The surrounding area prescribed by the norm and the background area are generated automatically, can however be edited and adjusted later. DIALux calculates the maintenance values of the illuminance and its uniformity on the prescribed illuminance grids. You can find the results calculated for these areas in the result tool in the documentation under "Summary of results EN 12464".



























Areas of activity

Areas of activity


According to DIN EN 12464 - 1, in areas in which activities are carried out, the median cylindrical illuminance has to be checked in order to guarantee good visual communication and easy recognition of objects. The height for this test is 1.2 m for persons sitting and 1.6m for persons standing. You can find the results in the result tool or in the documentation under "Summary of results EN 12464".


























Room main surfaces

Room main surfaces


DIN EN 12464 requires that the illuminance on the main surfaces within closed areas is checked. This can be achieved with this tool. We recommend automatic positioning for empty rooms. If furniture or obstructions conceal the walls, it is better to create the main surfaces manually. Draw the contours of the relevant area as a rectangle or a polygon. DIALux generates suitable calculation objects automatically. The easiest method is to construct the main room surfaces in a 2D view. Please note that for very small areas no grids are generated if the areas of the perimeters are greater than of the surface itself.














Room main surfaces