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Vertex map growth and decay - how to achieve

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  • Sweeping Motion
    Sweeping Motion last edited by Feb 9, 2024, 12:07 PM

    I'm using a vertex map on a spline to trigger a rope simulation.

    I can grow the weights but I'd like them to dissipate over time . Kind of like a wave or infection where the infected die out. However I can't seem to achieve this with the decay field.

    Could anyone advise me on how to do it?

    My current setup is:
    spherical field that starts the growth set to normal
    freeze with growth set to normal

    When I add decay nothing really happens.

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    • Dr. Sassi
      Dr. Sassi last edited by Dr. Sassi Feb 9, 2024, 6:57 PM Feb 9, 2024, 6:55 PM

      Hi Sweep Motion,

      It is always better to share a simple c4d file here (smaller than 1MB, or via DropBox, Google, Apple, Adobe, Wetransfer)

      Please have a look here:
      CV4_2024_drs_24_ANsv_01.c4d

      I have set up a Formula Field in the Vertex Map. The Formula is simple: ID<f
      The f in the Formula represents the slider in the Variables. So you can animate this.

      A great tool for this to observe is the Main Menu> Structure Manager. When open, please set the Mode to Vertex Map.
      Please note that this is not live update information; it must be stopped to refresh the values.
      As a side note, the Structure manager also allows us to easily access how many "points" the spline has.

      🔒 Log in to view

      This helps to define the f value that needs to be set to get a working formula with the Point ID of the Spline.

      The ID idea helps, even with Splines like a Helix, to change things from start to finish.

      Since this would be a 0% or 100% set only, I have placed the Decay after the Formula to have a smoother change.

      All the best

      Dr. Sassi Sassmannshausen Ph.D.
      Senior Trainer, Maxon Master Trainer, L&D - Strategist
      Cinema 4D mentor since 2004, Member of VES, DCS.

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      • Sweeping Motion
        Sweeping Motion last edited by Feb 9, 2024, 7:11 PM

        Thank you, I see. So there's no way to use the grow option in the freeze field?

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        • Dr. Sassi
          Dr. Sassi last edited by Feb 9, 2024, 7:15 PM

          Hi Sweeping Motion,

          please share your file and I will have a look into it.

          Cheers

          Dr. Sassi Sassmannshausen Ph.D.
          Senior Trainer, Maxon Master Trainer, L&D - Strategist
          Cinema 4D mentor since 2004, Member of VES, DCS.

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          • Sweeping Motion
            Sweeping Motion last edited by Feb 9, 2024, 8:56 PM

            shoelace_v03.c4d

            Here's the scene. Thank you for your help.

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            • Dr. Sassi
              Dr. Sassi last edited by Dr. Sassi Feb 10, 2024, 4:49 AM Feb 10, 2024, 4:39 AM

              Hi Sweeping Motion,

              Thank you very much for your file. I enjoy working on the target instead of guessing.

              Here is your file back; please note that I have nothing deleted but placed things not in use on a layer.

              The first file showcases the function; you want to have it grow and then die off. The idea is to have a second Vertex Tag with the same function applied but triggered later. This is then used as a Mask for the first one. Grow then die; if this needs more cycles, perhaps use alembic, or you need to set the second one back to zero, which inverted means the first one is working again. Have a look, as words might be too abstract.

              🔒 Log in to view

              CV4_2024_drs_24_ANvi_01.c4d

              This is the simple version of your file.
              https://stcineversityprod02.blob.core.windows.net/$web/Cineversity_Forum_Support/2024_PROJECTS_DRS/20240209_CV4_2024_drs_24_ANvi_11.c4d.zip

              Here, I took the liberty to dramatize the die-off a little bit. Perhaps it is to your liking.
              https://stcineversityprod02.blob.core.windows.net/$web/Cineversity_Forum_Support/2024_PROJECTS_DRS/20240209_CV4_2024_drs_24_ANvi_21.c4d.zip

              Please test them carefully before going into production. This is the first time I have set this up that way.

              Enjoy your project

              Dr. Sassi Sassmannshausen Ph.D.
              Senior Trainer, Maxon Master Trainer, L&D - Strategist
              Cinema 4D mentor since 2004, Member of VES, DCS.

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              • Sweeping Motion
                Sweeping Motion last edited by Feb 11, 2024, 1:44 PM

                Thank you Dr Sassi!

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                • Dr. Sassi
                  Dr. Sassi last edited by Feb 11, 2024, 5:36 PM

                  You're very welcome, Sweeping Motion,

                  My best wishes for your project.

                  Dr. Sassi Sassmannshausen Ph.D.
                  Senior Trainer, Maxon Master Trainer, L&D - Strategist
                  Cinema 4D mentor since 2004, Member of VES, DCS.

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