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slot to allow activating or deactivating overlays has been added too.
Figure 7.3 shows the result of adding an overlay to show the colour scale.
Figure 7.3: Scale overlays shown in the viewer.
7.3.3 Units
In order to do a correct comparison between two different 3D models that represent
similar real objects we need them to be scaled properly. Since the units used to express
the models could be different, and in fact we will see that they are different depending
on the acquisition method, we have to allow the user to select the working unit.
We have done the following process. We decided that the metre would be working unit
that we had to use. Therefore, internally everything has been expressed in metres. The
user is going to have options to change the unit when loading a model, since he or she
has to decide what is the unit used in the file that contains the model. An option to
change the unit to express the different comparison measures is provided in the menu,
with the corresponding slot in the ViewerGLWidget class to change the units shown in
scale overlays. The user can choose as units multiples of the metre, that is, apart from
the metre itself, decimetres, centimetres and millimetres.
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