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    Cloth behaviour - bug?

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    • Sweeping Motion
      Sweeping Motion last edited by Sweeping Motion

      I don't understand the behavior of the cloth.
      I'm working on sort of a mylar balloon type of animation.
      When mix animation> with force is applied and the object are moved via keyframes the simulation pauses and then restarts once the mesh reaches it's last keyframe.

      Here's the state just before the last keyframe (no length contraction and other mylar effects)
      Screenshot 2025-02-09 140744.jpg

      After the final position keyframe. The simulation of mylar effects starts.
      Screenshot 2025-02-09 140752.jpg

      Final state
      Screenshot 2025-02-09 141802.jpg

      I don't understand why the simulation doesn't run all the time. Why the jump between when it's animated and then it isn't. There's no other keyframes at this frame.

      Here's a link to the scene.
      https://drive.google.com/file/d/1eUHXX1O8H9SqTfUU5HgAnzKNJImsrMb7/view?usp=sharing

      Here's a preview of the issue
      https://drive.google.com/file/d/1eV5Xov7LWNSdPU82i8oU6ipjgP8r7lY3/view?usp=sharing

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      • Dr. Sassi
        Dr. Sassi last edited by Dr. Sassi

        Hi Sweeping Motion,

        Thanks for the file and for using Google.

        The setup uses the Spline to produce an Extrude and then creates a new Mesh based on Remesh, then it applies the Simulation,
        The next frame starts with the Spline to produce an Extrude…etc. (You get the idea.)

        Either make them editable via "c" key or Object Manager> Object> Current State to Object (if this method is used, deactivate the original objects so they do not contribute to the Simulation.)
        Here a collage from various states after being cached.
        REEL5.jpg

        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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        • Sweeping Motion
          Sweeping Motion last edited by

          Thank you Dr. Sassi. I wouldn't have guessed this was the case. I'll see if this changes anything.

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          • Sweeping Motion
            Sweeping Motion last edited by

            @Dr-Sassi Dr , I converted the geometry but the problem persists. Maybe I didn't make myself clear in my post. What is happening is the creases that are expected to show up (and they do initially) disappear when the cloth geometry is being moved, but almost immediately come in once the last movement keyframe is cleared, even though the objects are still moving. I recorded the point on the timeline where it happens.
            https://drive.google.com/file/d/1iYXj-dlzL5rw-wRTfe0aJRDaApvpKUop/view?usp=sharing

            To me it seems like a bug.

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            • Dr. Sassi
              Dr. Sassi last edited by

              Please have a look here, Sweeping Motion,

              and cache it first.

              File
              https://projectfiles.maxon.net/Cineversity_Forum_Support/2025_PROJECTS_DRS/20250209_CV4_2025_drs_25_SIgc_01.c4d.zip
              Preview
              https://projectfiles.maxon.net/Cineversity_Forum_Support/2025_CLIPS_DRS/20250209_CV4_2025_drs_25_SIgc_01.mp4

              Is this closer?

              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

                @Dr-Sassi This looks better in the preview but it's not really doing what I want which is to move after the 'unpacking'. I want them to come together and the problem remains - as long as there a position keyframes in the object the mylar effects (so I guess the target length and so on) are not taken into account and I'd like to know why that doesn't work. Could you please shed some light? What is it I'm doing wrong?

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                • Dr. Sassi
                  Dr. Sassi last edited by Dr. Sassi

                  Hi Sweeping Motion,

                  How would a balloon be animated practically with a single rope or wind? I tried both, but that didn't lead to an easy "untangle" after the Sphere shape.

                  I have better results when I also place the Inverted Vertex maps in the Balloon Maps field.
                  Please experiment with the same vertex map in the "With Force" section.

                  When many forces pull on the mesh, the " Force " distribution must be balanced carefully.

                  Here is my exploration "dummy":
                  CV4_2025_drs_25_SIbs_01.c4d

                  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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