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Sverchok: offset one side.

  1. T by theoryshaw on 23 Dec 2020, edited 6 Jan 2021 #

    Is there a Sverchok node, like Contour 2D that would offset only those edges in blue below? That is, only on one side.

    Something similar to Offset Edges in the Edit Mesh Tools Plugin, for example.

  2. M by Moult on 23 Dec 2020 #

    Ping @nikitron :)

  3. J by JanF on 24 Dec 2020, edited 24 Dec 2020 #

    There are several problems with this, what exactly are you trying to achieve? Did you try offset curve node? http://nikitron.cc.ua/sverch/html/nodes/curve/offset_mk2.html

    How does the node know in which direction should it offset? Do you need only mesh edges or splines as well? 2D 3D ? If you're working with mesh edges junctions connecting more than two edges (T) are rather complex.

  4. T by theoryshaw on 24 Dec 2020 #

    Thanks @JanF , that gave me a clue to get a little further.

    I got somewhat close, but as you can see, the offset lines don't connect. File here

    Ultimately looking to create a multilayer wall that is controlled by one polyline path.

  5. T by theoryshaw on 24 Dec 2020, edited 24 Dec 2020 #

    @JanF do you have a gitlab account?

    If so, i'll add you to that repo, so you can push/pull files as well.

    If you're on Windows, this could help set you up.

  6. N by nikitron on 25 Dec 2020 #

    try this out

  7. T by theoryshaw on 25 Dec 2020, edited 25 Dec 2020 #

    Thanks @nikitron, but is there a way to offset an open polyline?

  8. T by theoryshaw on 25 Dec 2020 #

    For example, something like this?.

  9. B by bruno_perdigao on 29 Dec 2020 #

    Hey @theoryshaw, I was trying something similar in sverchok. I think I got a good result, but it still has some room for improvement. The solidify node has an output for the new polyline created by the extrusion, so you can use that as the base for a new layer.

    Here is the file, let me know if it helps.

  10. T by theoryshaw on 30 Dec 2020 #
  11. S by stephen_l on 30 Dec 2020 #

    Such approach are limited to simple lines, in order to handle complex shapes like "T shaped" (not only), library such as geos / shapley / pygeos use a label based graph, and are able to handle offset and "buffer".

  12. T by theoryshaw on 31 Dec 2020, edited 31 Dec 2020 #
  13. T by theoryshaw on 1 Jan 2021 # +7 votes

    Here's a mashup approach, using @bruno_perdigao, @Erindale suggested approach and @vicdoval's offset script. File here.

  14. T by theoryshaw on 3 Jan 2021 #
  15. N by nikitron on 6 Jan 2021, edited 6 Jan 2021 #

    this is in Russian, but all steps on screen

    All about fasade construction:

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