CGAL users discussion list

[Alexandre Severino <>]

Sorry that I wasn't specific enough. I always forget to include some important information.

Unfortunately, it has to be both continuous along a "curved" high-res polyline, and the mesh is closed.

On Wed, Oct 9, 2019 at 12:33 PM Sebastien Loriot (GeometryFactory) <> wrote:

Do you want a continuous translation or a discrete one along a polyline?
Is your input mesh close or open?

If the mesh is open and you consider discrete translation, you might be
able to use extrude_mesh() for each segment:

https://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__meshing__grp.html#ga102e1ba5d709c5e53e013160792e4d08

and compute the union of all segments using corefine_and_compute_union():
https://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__corefinement__grp.html#gad7e1741a7ce41a5846cf86494982ca8b

Sebastien.

On 10/9/19 3:09 PM, aseverino wrote:
> This is probably the most unusual problem you guys ever heard of, so I'll not
> be surprised if there is no solution for it available with any combination
> of tools in CGAL.
>
> Remember when you had Windows 98 and the screen would freeze up with an
> error shown in a dialog popup? Remember moving this dialog box around and
> its canvas leaving a drawing "trail", as if it was some sort of a slug?
>
> I'm trying to recreate exactly that effect, but with a 3d object.
>
> Imagine you have a not-so-primitive shape, like a 3D cross, and you want to
> drag it around in a 3d space, in the 3 axis, leaving a trail behind. The
> final geometry ends up being this snake-like geometry based on the initial
> 3D cross. As if you moved a clone of the cross just a fraction of a
> millimeter, made an union boolean, and repeated until you have the desired
> result.
>
> How would you do it? Considering that a boolean would take hours of
> processing.
>
>
>
> --
> Sent from: http://cgal-discuss.949826.n4.nabble.com/
>

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Alexandre A. Severino

Systems Developer and Analyst

+55 11 99994-9148

Si quieres cambio verdadero, pues camina distinto!