True Dimension in Catia 2D 1

[CAD2015]

What's the use of True Dimension in Catia drafting?
When should be used and why?
I do not get it!

CAD 2015

 

[jackk]

Sometimes a feature is projected in a drawing view, such that it is not perpendicular to the viewing plane. And dimensions referencing these non-perpendicular features will be based on the foreshortened lengths. This can be fixed by editing the dimension to show the true length, instead of the projected length.

This is common when dimensioning isometric views.

 

[CAD2015]

Thanks a lot, Jack.K!

CAD 2015