I can't get ropes to stop infinitely stretching when connected to other objects

[Kouraib Abdmalek]

Hi Eric,

I think using Bend Deformer would be easier to do this, I’ve attached a file below with a screen recording, just let me know if this works for you.

Unroll-the-rope.c4d 563 KB Cinema 4D project files - Click to view

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2024-11-14-10-47-02.mp4 460 KB MPEG-4 - Click to view

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[Eric Pereira]

What i am looking for is a way to have the entire rope able to be pulled along by one end (the other end is anchored in some way) so it is art driven but also retains the rope dynamics simulation. A deformer would be very limiting.

There must be a way to get it to retain its length?

I could rig the rope with bones and use IK to move it along like that, but then I lose the physics of the rope being affected by other forces like gravity.

[Kouraib Abdmalek]

Thank you for the clarification, I think you could achieve what you are looking for by using the Rope expression and the connector Tag, I have put a link below to a tutorial explaining how to do this.

https://www.youtube.com/watch?v=SLnyucafG8U

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[Eric Pereira]

I tried that tutorial exactly and it doesn’t work.

Are you able to replicate it?

[Eric Pereira]

I am using c4d 2025.0.2. I don’t know if they broke this whole system recently.

Can you confirm if that tutorial works, and if so, share a file?

[Kouraib Abdmalek]

It also didn’t work for me exactly like in the tutorial but instead, I made the cage editable, then I stored the anchor point selection and put it in the connectore tag as in the screen recording below and it worked like in the tutorial, I’ve attached the file too, let me know if this works for you.

2024-11-16-09-47-26.mp4 4 MB MPEG-4 - Click to view

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test-1.c4d 251 KB Cinema 4D project files - Click to view

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[Eric Pereira]

I opened your file and it doesn’t work. The object just falls down not attached to the rope at all.

What version of C4D do you have?

EDIT:
Oh, I can see your version in the video.

I opened your file in C4D 2024.5.0 and it works perfectly as in your video.

That confirms it. Maxon broke the simulation system in 2025.

Figures.

Thanks for your help.

[Kouraib Abdmalek]

This is weird because it worked for me as you saw in the previous screen recording it might have a relation with the version, click on clear in the connector tag and then click on create again, it might be necessary to create the link and make sure the initial settings in the connector tag are the same as what I have or not because this might change from version to another, also make sure the units in the Preference is centimeters.

2024-11-16-11-44-27.mp4 514 KB MPEG-4 - Click to view

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[Eric Pereira]

I will try again, but I have already tried every tutorial I could find and they all don’t work for me.

I tried the balloon on the string, the hanging animal skull, and nothing works using any possible simulation combination with the rope.

[Kouraib Abdmalek]

I don’t think you should trying to do it another way since you make sure that the previous method is working, you just have to try to find a way to avoid the version problem, I think that the same simulation should work on your version only there may be a slight change in the method, as you saw in the tutorial when they check Update Live the link is created but when I did the same thing with me nothing happened until I click Create, you may need some slight changes like this to work for you, you could also read the help to make sure how the simulation works on your version.