DPA|Cauberg-Huygen received the assignment to perform daylight calculations (rather; validate the size of a window) against the building code for the huge Hydepark project in Hoofddorp. According to the building code, nextdoor buildings do not have to be included in such calculations. However, in this project the building next door was around 40 metres high and the street profile was only 14 metres. This creates a significant daylight reduction that becomes questionable from an aesthetic and comfort point of view whether this design acceptable for the end user.

Abstract of the 3D-model geometry

By means of the regular calculation method, the daylight factor was calculated twice. Once without the nextdoor building and once with the nextdoor building. The difference between these situations was for the most critical appartement a drop from 55% (bottom limit) to 46% (insufficient) equivalent surface area of the window. The 55% can be thus used to convince the municipality on putting a checkmark on the design, but it did not directly receive a checkmark by the client. Due to their limited understanding of the meaning of these factors, they simply did not know what they were selling to the end user.

Sunpath model around the 3D geometry

omrt imported the 3D model in Rhinoceros, linked the geometry to Grasshopper, and created a daylight script with Honeybee around the 3D model according to NEN 2057 regulations. The output of the simulation (the amount of lux per square metre on the floor and the windows) were used to calculate the daylight factor for each room.

Amount of lux in one room without the nextdoor building block

Amount of lux in one room with the nextdoor building block

3D render based on the lux amount of the same room without the nextdoor building block

3D render based on the lux amount of the same room with the nextdoor building block





The real value in this project was found in the visualisation in Virtual Reality of these daylight factors and the parametricism of the window sizes. Now, the client was able to communicate with the architect about the window sizes with help of a very basic tool; their own eyes.

In conclusion, this trial was one day of work for omrt and it formed a definite conclusion for the windows in the building. Normally, this process could take up to two weeks.

The client walking through their own project in Virtual Reality, combined with a fully realistic and NEN-complying daylight simulation

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