About Project

Current presentation of the model

The digitalisation of the Langweil model was an incredibly difficult project from a technical point of view. The aim of the project was to create a digital representation of the paper Langweil model of Prague so that the model could be looked at, examined and described on a computer. The accuracy of the details was set at 1 mm in geometrical aspects (tops, edges, outlines) and the accuracy with which the textures of the model were scanned should correspond to .DPI of 0.1 mm vertically. During the digitalisation the fact that the digital version of the model should be used as a basis for reconstruction if any part of the model was damaged was also taken into consideration.
The basic limitations for digitalising the model were as follows:

  • The model is usually kept in a dustproof glass display case. The model could only leave this display case during the winter and only for a maximum of three months.
  • The model is made of paper and consequently is very fragile so therefore no tactile measuring method can be applied, purely optical methods must be used.
  • The paper model and its paints are sensitive to infrared and ultraviolet light therefore they could not be used to measure the model. Lighting was restricted while the model was being measured.
  • The model can be divided into 52 separate parts of various sizes. The largest of the parts can be placed on an area of 1600 x 1000 mm.
  • The models of the buildings are polygonal and contain exceptionally detailed texture.

The result of the whole process was a detailed 3D model of old Prague from 1837 which is available not only to the specialist public but there are also other applications for the public such as a simple game and an interactive 3D model on CD-ROM.


Motivation for the digitalisation of the Langweil model

Current presentation of the model

The public has had access to the Langweil model in the City of Prague Museum for a number of years. In the past the model was displayed as an ordinary exhibit without any special protective measures. In the 1990’s, however, an examination was made of the way the model was exhibited and it was decided that the model would be exhibited under a special display case. This protective zone around the model ensures a dust-free environment (therefore dust does not have to be frequently cleaned from the model and so it does not suffer from wear and tear, it also prevents any fluctuations in temperature and reduces the strain from lighting on the model. The model predominantly consists of paper and painted wood, consequently varying temperatures affect it significantly and will also lead it to gradually ageing. The model is therefore usually kept in a kind of “greenhouse” with tinted glass and limited lighting inside.