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Cloth behaviour - bug?

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  • Sweeping Motion
    Sweeping Motion last edited by Sweeping Motion Feb 9, 2025, 2:35 PM Feb 9, 2025, 2:30 PM

    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 Feb 9, 2025, 6:45 PM Feb 9, 2025, 6:44 PM

      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 Feb 9, 2025, 8:18 PM

        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 Feb 9, 2025, 9:15 PM

          @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 Feb 9, 2025, 11:50 PM

            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 Feb 10, 2025, 8:39 AM

              @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 Feb 10, 2025, 8:03 PM Feb 10, 2025, 8:03 PM

                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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