In some cases however, a smooth transition or surface is required. This is possible by using the function Three-point canopy, Four-point canopy in Allplan 2008.
This function can be found in the Bonus Tools, tab 3D modelling. Select the 3 (or 4) angular points of the ‘canopy’ and specify in the concerned dialogue the number of divisions in the length and transverse directions, as well as the sag percentage in these two directions. If we choose for a sag of 0% in both directions we obtain the screen in which one has the possibility to choose the type of the object: an area or an object.
When the last option is chosen, you have the possibility to create a 3D volume with the ‘canopy’ as upper part and z=0 as lower part.
In the image below an example of such a volume is given at the right hand side.
It is also possible to create double curved surfaces in the other main directions (XZ or YZ), but here more interaction from the users is required. As the volume is always generated between the “canopy” and the level z=0, it is necessary to deduct the obtained result from the original volume. As is also the case with the other 3D modelling functions, the creativity of the user is the only restriction for getting stunning results.
