[Joe Obuchowski]

Hi,

Thanks but this was not suitable as it’s a cloth animation that needs to be followed.

I did however figure out a way for anybody interested.

I used the 4 points to get my central position null. I then attached nulls to the front and side points. I then used a target tag on my middle position null so it would track the side null, finally I put that inside another Null with a target facing the front null. (lots of nulls)

But this resulted in a central null that follows the central position of the tube points, while also keeping the correct rotation.

Now I do have one more issue where objects are tracking about 1 frame behind when I render, but I’ll make a new post on that as it’s not relevant to this posts issue.

Best,
Joe

[Joe Obuchowski]

Thank you Kouraib,

For more context, the cloth simulation tube waves around and needs to have a sort of object aligned to the top of it while it moves about.

Here, this may help get my idea across more: https://drive.google.com/file/d/1Mhbp4nlyvb-jQmX-stv2CZHbLQLUbRo4/view?usp=sharing

See how the cube is positionally tracked perfectly using my xpresso system – just can’t get the rotation to follow.

Thanks,

Joe

drive.google.com

Cinema 4D 2024.2.0 - [Untitled 2 _] - Main 2024-01-24 14-16-10.mp4

Cinema 4D 2024.2.0 - [Untitled 2 _] - Main 2024-01-24 14-16-10.mp4

[Joe Obuchowski]

Slight update.

I’ve gotten the position to track exactly as I need, but cannot figure out how to get the rotation to follow.

Method used for position: Xpresso ‘Point’ node is taking the positions from 4 points using point index > Pushing those into Vector2Reals to split into X, Y and Z > Adding up all values from each axis then dividing them by 4 (4 points) > And that’s giving me my position values.

Screenshot should illustrate this well.

I’m just still having trouble getting the rotation link up, any suggestions?

Thanks,

Joe

[Joe Obuchowski]

Hi Kouraib,

Thanks for the quick response!

Thanks to the info you gave me, I have successfully created the point at the centre of the top of the tube. Do you know how I would then go about attaching a Null to that point? I’ve had a google, been messing with constraint tags and attempted expresso – but cannot work out how to get it to connect and stay connected.

I have the point as a ‘set selection’ tag also, it’s just getting a seperate Null to grab that position and stay tracked.

Best,

Joe

[Joe Obuchowski]

I’ll look this up, I don’t have x-particles but i’m sure it would come in handy for things like this.
If you have more ideas please let me know!

Cheers for the suggestion!