Delete a circle

Patric's Avatar


21 Nov, 2019 08:09 PM

Hi, how can I remove the first circles marked in the picture?

  1. Support Staff 1 Posted by john on 22 Nov, 2019 05:10 AM

    john's Avatar

    Hi Patric,

    It looks like you're trying to make a clean paraboloid. I was unable to replicate your method just from the screenshot. I'm guessing your copy node is scaling and vertically translating an ellipse, but I couldn't tell what scaling factor and y offset you were using. (If you want me to play with that, please reply with a zipped copy of your Nodebox file attached.)

    Nevertheless I was able to achieve what I think you're aiming at using an entirely different method (see screenshot and attached Nodebox file).

    I used a quad_curve node to create the parabolic outline of the shape, and used resample to plot points along that curve. I then paired points on the left side of the parabola with points directly across from them on the right side and drew a series of circles connecting each pair.

    As you can see this produces a cleaner paraboloid without the dark circle on the bottom. You can adjust the shape of the parabola with the quad_curve node and adjust the spacing between each circle using the number node feeding into the resample node (choose an even number).

    I'm sure there are other ways of doing it, but this seems to work pretty well. Please let me know if this works for you.

    Thanks for asking such an interesting question!


  2. 2 Posted by Patryk on 22 Nov, 2019 09:39 AM

    Patryk's Avatar

    You solved it beautifully! Thank you very much. I bought a Roland dxy 1100 and I want to scratch it a little. I will let you know what the result is.

  3. Support Staff 3 Posted by john on 22 Nov, 2019 09:13 PM

    john's Avatar

    Cool! I would love to see a photograph of some plotter output - maybe in the "Show Your Work" section.

    I've long thought that NodeBox and plotters could could work well together; you might inspire others to try it. I'd be eager to hear some details of exactly how you did it, problems, tips, etc.


  4. 4 Posted by Patric on 22 Nov, 2019 09:22 PM

    Patric's Avatar

    As soon as I can run everything I will put on the forum :)

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