Good ! Thank you for your reply.

It works quite well by adding this system to both sides.

moving_on_surface_2.c4d

I'm creating a new post.

So I found a solution for movement on the tank on a surface; with ray collision, I have more freedom of movement. I've attached the file.

https://we.tl/t-SIrv1LYYH9

Good i understand, thanks you very much !

I have another question. I created a tank rig (I've attached the files and a video to explain). I'm using a mesh with Deformer Shrink Wrap on a surface the tank drives on. I'm using a Matrix to retrieve the positions of the mesh points, and the average of these point positions orients the tank on the surface. But the problem is that it doesn't follow the surface very well. Is there a technique to make an object perfectly follow a surface like the red cube? As if it were actually colliding with the surface.
https://we.tl/t-RyuQlPtrag

Yes, of course, it works better with the previous global matrix. thanks you

I managed to create a fairly simple system where I calculate the distance traveled and then use it for wheels and tracks
track.c4d

Good Thank you for the explanations.

Interesting the goal is to be able to automatically rotate wheels or tracks based on their size and the vehicle's orientation. I acquired a tank rig (I've attached the C4D file). I isolated the Xpresso function that handles the wheels and simplified it. As a result, the wheel rotates perfectly according to its size, the distance traveled, and the orientation. And the wheel's rotation value doesn't reset to 0; it accumulates simply by moving the controller in the interface. The problem is that I don't fully understand how Xpresso works. I don't know if it can be simplified even further.

WHEEL.c4d

Hi
I'd like to know how to add and accumulate values ​​in Xpresso. For example, I have a moving Null, and using the Distance node, I get its distance traveled each frame. I'd like to be able to accumulate each value at any given time to increase the gauge. Furthermore, I'd like to be able to increase the gauge even when there's no animation, when I move the Null within the interface. How can I do this?DISTANCE.c4d

good thanks you ! While experimenting with different techniques, I noticed that there could be additional tools for rigging. The Create IK Chain tool exists, but not Create IK Spline. A tool that allows converting an edge selection into a spline, then into a joint, and then adding an IK spline with controllers all at once would be ideal. This would eliminate the need to perform each step manually.

Nice we can have good result with the Spline deformer It's a shame we can't multiple Deformer Splines on an object and use fields on them.

good thanks you, yes it's good for me, i found a good way to place quickly the IK spline on face

thanks you !

I think I've found a fairly simple and quick setup to implement on a character.
video link : https://we.tl/t-NHA42iH0PP

SETUP_IK_SPLINE.c4d

Nice thanks you yes i tried the face rig tutorial introduction but i can't do exactly what i want. I tried something else; in the IK spline tag, I can link the size of a null to the length of the tangent of a point on the spline. I think I'll create a setup with the spline, joints, and nulls, which I'll then duplicate and place on the character.

video link : https://wetransfer.com/downloads/1f5879cfef13990556c146a3b11a22ea20251226105108/1583f6?t_exp=1767005468&t_lsid=fedd0751-1e46-4996-bda5-0e13466adbf7&t_network=link&t_rid=ZW1haWx8YWRyb2l0fGIzNzkzZDA2LTJjNzAtNGM5NS1hYzk4LWM5NDFjNjZjYWM2Yw==&t_s=download_link&t_ts=1766746281

Thanks you for the reply the initial is to rig a face like this : https://www.youtube.com/shorts/3oeox_DL-SI
I'm testing different techniques to make the workflow faster., the pink squared Nulls are Controllers

https://www.swisstransfer.com/d/e072875d-7c88-4f8e-be73-b47056d3b75d

thanks you ! yes I think using a script is the fastest way if I need to create about twenty IK splines; if I remember correctly, they often use scripts for rigging in Maya.

Hello, I'd like to quickly create IK splines. I'm using this video as a guide, and I'd like to know if there's a quick way to go from this hierarchy of joints to this one with nulls? (See the C4D file and the video link). Perhaps using a script? Or is there a simpler way to create an IK spline? I also want to use Bendy Bones as inspiration in Blender.

link :https://youtu.be/6Ctda4TSYYc
Joint_hierarchy.c4d

Thanks

Nice ! thanks you it works !!

Hi i have an animation with a rigged object, i want to clone it and add some variations on the animation. I used the time offest with a ranfom effector but it not working. The Null controller have the offset but not the mesh.test.c4d

how can i fix it?