From: Eps Ilon <alexander.graefe@...>
Date: 2008-01-28T23:11:59+09:00
Subject: Sketchup: Constructing Triangle with Ruby

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?
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