Thanks for the feedback, MaverickMongoose,

Please explore the Rigid Body Tag > Collision > Search Radius. Increase to perhaps 5cm, then adjust to a lower or higher setting.

https://help.maxon.net/c4d/2026/en-us/Default.htm#html/TRIGIDBODY-RIGIDBODY_PBD_COLLISION_GROUP.html#RIGIDBODY_PBD_THICKNESS

Let me know if that works for you.

All the best

Hi MaverickMongoose,

Thanks for the file.

I'm not aware if you have tried this. Throwing a hula-hoop ring away from you, while at the same time setting the ring in rotation that would go against the forward movement. At one point, the rotation has canceled the forward motion, and the ring comes back. In short, two forces fight against each other; if they don't cancel each other out, one or the other wins.

The same feeling is present in the large Sphere; the Rotational Mass is set to 100%. If set to 1%, the Sphere can roll more smoothly along its path, with no heavy inertia fighting against the rotation.

The example below replaces the Force and uses a Spring instead, which allows the larger Sphere to exhibit more of its inherent energy and define its own path more effectively. While the Rotational mass is 1%, which allows quickly to adapt.

CV4_20256_drs_25_SIsf_01.c4d

Enjoy

P.S.: here is a demo of the rolling brush effect on the hair (no brush included), considering that the brush takes it one rotation with it. Perhaps not even more than a 90º rotation, but to go full in…)
The change of "size" (from floor into the tube) was a little bit tricky, but the PoseMorph helps to keep it parametrically. Adjust the Pose strength, and you get a finer tube suck effect. The second Field is a very rough idea to mimic the brush attacking the floor in a spiral. The reason I believe the spiral is introduced is more to keep the power needed to rotate it evenly. If the brush were parallel to the axis, the driver belt would get short stress moments at high frequencies. Perhaps I missed a point here, but that is my best result. Hence, the little disturbance should be enough.
CV4_20256_drs_25_ANvc_11.c4d

Enjoy.

Hi Nick,

Thanks for the file.

I do not know how the brush rotates on this model. Let's say I look from the side, so the handle is on the right and the "head" on the left, is clockwise or counterclockwise?

If counter clock, the project file from above should do. If it brushes against the forward motion, it needs an adjustment.

My current main concern is, there is a spiral brush on the rotating cylinder. Typically, those move very fast, but with the animation, it might be slowed down to showcase the workings of it. If so, the spiral would attack anything on the floor at different times, while the vacuum effect would blend that effect and soften the resulting changes based on it. Is this part of the visualization?

Here is a demo of that expected influence to the dirt. Just to get a clear idea what is needed
CV4_20256_drs_25_ANvc_01.c4d

Cheers

Thank you very much for the feedback, MaverickMongoose,

My best wishes for your project.

Hi Nick,
I fear the file was larger than 1MB, leading to an error.

Would you mind sharing it via WeTransfer, Google, Dropbox, Adobe, or Apple cloud services? Please upload unzipped and share the URL without using the HTML wrapper. Thank you.

All the best

Thank you very much, Instruction dance,

The two spline paths need to shape the brush roller. I have no data on it.

If there is any sketch that doesn't violate perhaps an existing NDA, I'm happy to look in the morning. (I'm on Pacific time)

Enjoy the exploration, and please feel free to ask. I'm happy to look into it.

Cheers

P.S.: here is a very procedural version.

The "hair" is just sketched on the Plane, with the Spline Sketch, while Snapping is set to Polygon only.
It has some set up work, but is super fast.

The scaling of the "hair" is based on the rail-spline set up, closer to the spline inside the vacuum.

CV4_2026_drs_25_ANhs_01.c4d

The silly vacuum-cleaner-model is without any function, just to demo the scene.

Enjoy

Hi gear-conflict,

Please check with tech support.
https://www.maxon.net/en/support-center

Fingers crossed it is solved in no time.

Cheers

Hi introduction-dance,

Please explore the two files below.

One is based on a simple simulation, the other uses just deformers to create the effect.

These are just rough starting points.

The key here is first to find something you feel most comfortable with to change during a project.
The version with the texture and deformers might benefit from a second layer of "hair" while moving it a little bit differently, to give it a more natural move.

Texture and Deformer-based
https://projectfiles.maxon.net/Cineversity_Forum_Support/2025_PROJECTS_DRS/20251007_CV4_2026_drs_25_ANhv_01.zip

Simulation sketch
CV4_2026_drs_25_SIhw_01.c4d
just one more detail
CV4_2026_drs_25_SIhw_02.c4d
Let me know what feels better to you.

All the best