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Been playing around with it a bit, it's not perfect, and not super fast to calculate, but getting somewhere I think. Slightly different approach. Still playing but thought I would share and see if anyone else was interested in playing around! As a side note, the dynamics for this is cached. All you have to do it swap out the dynamics tags for your own geometry shape, and create a spline with "Bezier - Uniform distribution" that fits inside the geometry. Up the point count to whatever you need, for this one I used 200, but it could be larger or smaller depending on the tightness of coils you want. Then drop the spline into the tracer and let it sim out. TEST COIL_Differential Growth.c4d

Thank you for these 2 solutions you have provided @HappyPolygon !!! I tried both of the solutions you provided, however, I wasn't sure how to have the matrix object control the flattened tracer spline? So I tried the Rope dynamics, which works better and seems ok for less dense filled objects, and is interesting, but feels a bit different in the way the spline curves look and coil. Ideally I would want it packed more tightly like the image above. I am going to try and give the solution that @Hrvoje kindly provided as well and see if I can get something....If I do I'll let you know what I come up with! Thanks again everyone!

The capsule node that I purchased is really fun. Even though you can't fill a specific volume, you can create a 3D cylindrical type diffusion then spline wrap it and get some interesting results. Just a FYI...I still would LOVE a version that can pack it tight like this image but filling a specified volume. That would be AMAZING!!!!

Thanks!!! I will try and install 2023 and see what I can get. The node/capsule video that @Hrvoje shared was great to watch, and makes me think a solution like this could be created with a node based setup for filling a volume that doesn't depend on creating cyclical dependency loop. I really need to start learning mode about nodes, seems super powerful if you can understand what the nodes ...lol

like these. Is this possible to do with the capsules?

oh cool !! Yeah I need a setup to fill a specific volume so that the growth fills it and is contained within any give mesh.

what version of c4d does it actually work in? I tried it in an older version of R18 that I keep on hand for opening older file formats and it didn't work in that either unfortunately. I don't have any other older versions currently installed, but I could install a version where it works possibly so that I can do what I need to do while we work on figuring out a new solution that works in 2025...it would be amazing to create a capsule that can do this...I am looking into trying to build one, but I sadly don't have much experience with programing and capsules/nodes building...so could be a while...lol

I found this: (see video below) I purchased the Capsule file from his Patreon. It's very fast and fun to play with, unfortunately it doesn't currently work to fill volumes. I reached out to him to see if it might be possible to implement, and he was quick to respond that it doesn't currently support volumes but is an interesting idea. I wish I new how to create these capsules etc and had the knowledge to go in and expand the capabilities myself....but maybe there is someone out there that can ....

Yes I just need to create a static mesh with it's volume filled with a non intersecting entanglement.

Hi I downloaded the files and was trying to adapt this to a new volume but can't figure out where you change the volume object that you want to fill. Also in 2025 it doesn't seem to fill the volumes at all...it just kind of wiggles. Anyone have any solution/fix for using this in 2025? I would love to get this working!!!!! Thanks