Hidden line image: creating an isometric view without shortening
Technical Support FAQ
Category:
Architecture->Hidden line image
Programs:
Allplan 2017
Allplan 2016
Allplan 2015
0000DBE6
https://connect.allplan.com/en/faqid/0000dbe6.html
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Question:
When I create a hidden line image of an isometric view (Viewmenu -> View-> Front Left, Southwest
Isometric Viewor any other isometric view), Allplan does not use the original dimensions so that the resulting
lengths are distorted.
How can I make sure that Allplan creates the hidden line image based on the actual dimensions?
Background information:
In accordance with DIN, an isometric view is calculated as follows:
Allplan chooses the projection plane and the axes so that all the axes are shortened equally = axonometric
projection of an isometric view.
This is the case when all the angles are the same: 120 degrees. The result is an equilateral triangle. Each
side is shortened by two-thirds or 0.8165. However, the edges parallel to the axes are usually not shortened.
Isometric view:
Angle of the coordinate axes:
x axis: 30 degrees to the horizontal
y axis: 30 degrees to the horizontal
Shortening:
x : y : z = 1 : 1 : 1 (using a factor of 0.8165)
Solution:
When calculating an isometric view, Allplan shortens all directions by the same value (x:y:z = 1:1:1), using a
factor of 0.8165.
All you need to do is resize the result in the destination drawing file by the corresponding factor (1.22475) in
the x and y directions. After this, all the edges are displayed at their actual size and can be dimensioned.
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