once again… you are right!
Due to its diffusion ArchiTerra is something like a work-in-progress. I mean if we can make easier it use or if we can add new issues requested by the users we do so immediately, including them in the next maintenance release.
But, unfortunately, this means that the “standard” documentation (I mean that one included in the user manual) cannot be update with all the new added features.
The ArchiTerra you just downloaded uses a different algorithm/procedure to define/calculate the outline.
You have to draw (first method) a polyline around your terrain.
Drawing the polyline you will see two lines (left and right side of the middle-line) which define a so-called corridor of search.
The d value is the width of this corridor.
In order to get a correct outline this corridor of search should includes the nodes you want to use as perimeter reference.
The alpha value is the so called angle of search: ArchiTerra will use this angle to look for the next node of the perimeter (the angle is taken from the angle defined from the polyline you draw).
Not so simple to describe in English for me… but is very simple I attached to this post an image showing you what I mean.
In the image you see some points and one outline side (the thick red line).
The two blue lines represent the corridor of search width (D value) all the points external to this corridor won’t be in the calculated outline.
The two light blue cone represent the angle of search (2xalpha value is the total angle width).
Starting from the A point, the B points won’t be in the terrain outline because it is external to this angle and it will take into consideration the C point (more distant but internal to the angle of search).
The same, starting this time from the found C point for the two nodes D and E (D will be discharged and E will be included).
The best things is to use the standard value for the angle and a proper size for the width (it depends on the distance between the point and from their position) than simply “approximate” the perimeter you want: you will get the result.
The result is an ArchiCAD fill so, later, you can edit it by adding or deleting the nodes you want or not.
In your case, probably, you draw the rectangle totally “out” from the existing points (so the corridor of search doesn’t include none of them) and ArchiTerra isn’t able to find the solution.
Please, send me your file (firstname.lastname@example.org
) and I will check it, sending you the right suggestion to create the terrain.
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