From: "G.Durga Prasad" <gdprasad@...>
Date: 2008-01-30T22:32:00+09:00
Subject: Re: Sketchup: Constructing Triangle with Ruby

On Jan 28, 2008 9:11 AM, Eps Ilon <alexander.graefe@web.de> wrote:
> Hello,
>
> i'm constructing triangles with ruby and try to plot them within
> Sketchup. In most cases, this works. But sometimes, an error occurs:
> "Points are not planar", which is quite strange for a triangle...
>
>     model = Sketchup.active_model
>     entities = model.active_entities
>     k = 0
>     for i in 1..3 do
>         x = arr[k]
>         y = arr[k+1]
>         z = arr[k+2]
>
>         pts << Geom::Point3d.new([x,y,z])
>
>         k += 3
>     end
>
>     pts << pts.first()
>
>     begin
>     face = entities.add_face(pts)
>     rescue
>     puts $!.message
>     puts pts
>     end
>
> arr is an array with the triangle coordinates (the coordinates come from
> an external data source, but thats not the problem)
>
> An example output for an error is
>
> Points are not planar
> (0,08255m, 0,003858m, 0,11049m)
> (0,083007m, 0,004218m, 0,11049m)
> (0,082855m, 0,004111m, 0,11049m)
> (0,08255m, 0,003858m, 0,11049m)
>
> The last and the first point are the same, but thats correct (a face is
> constructed by a closed line).
>
> o you have any ideas where I can find the error?
> --
> Posted via http://www.ruby-forum.com/.
>
>
My wild guess:
The first and last points may differ as they are built out of floating
point numbers.
Try integers to represent the points, at least , the first and the last.

Prasad