Coons 101
Anonymous
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‎2004-11-19 12:35 PM
‎2004-11-19
12:35 PM
Basically, if you create four (three-dimensional lines, thus) EDGES in space, and the corners of the lines intersect each other, you will have a description for a surface. The points on the surfaces are interpolated from the opposing edges. Think of two people holding a blanket.
The 'tricky' part is working out the formula / points for the four sides.
Note that the end points of each line have to be coincident (the same) otherwise you'll get a gdl error.
In the coil here I 'cheated' by setting two of the lines to zero (thus generating a 'pointed' end.
We'll come back to the 'spiral code' after the following example.
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Anonymous
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‎2004-11-29 05:15 PM
‎2004-11-29
05:15 PM
StuartJames wrote:I am under the impression that SEOs require solid elements to work. planar elements and surface models lack the normal vectors needed for the calculations.
Durval; I have never tried SEO's with planar objects (never felt the need to cut up something described geometrically). Does it work?? I would guess that it probably does - but maybe with occasional errors. Risky.
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‎2004-11-29 06:20 PM
‎2004-11-29
06:20 PM
Matthew wrote:Who needs CATIA
I am under the impression that SEOs require solid elements to work. planar elements and surface models lack the normal vectors needed for the calculations.

SEO's _do_ work with planar elements. At least sometimes!
- Stuart

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‎2004-11-29 06:33 PM
‎2004-11-29
06:33 PM
StuartJames wrote:Only as targets. Not as operators.Matthew wrote:SEO's _do_ work with planar elements. At least sometimes!
I am under the impression that SEOs require solid elements to work. planar elements and surface models lack the normal vectors needed for the calculations.
Djordje
ArchiCAD since 4.55 ... 1995
HP Omen
ArchiCAD since 4.55 ... 1995
HP Omen
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‎2004-11-29 07:36 PM
‎2004-11-29
07:36 PM
Djordje wrote:Yes, that's what i noticed. A planar element or a closed hollow shape is not a valid operator.StuartJames wrote:Only as targets. Not as operators.Matthew wrote:SEO's _do_ work with planar elements. At least sometimes!
I am under the impression that SEOs require solid elements to work. planar elements and surface models lack the normal vectors needed for the calculations.
There is a curved slope in the library, made with ruled (hollow), and it doesn't work for SEO (as operator).
It would be great to can extrude a coons surface to get a volume.
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