Hi Dr Sassi,

Thanks for these resources. They've gotten my gears turning and I think I have an possible solution to try for this. If it works, I'll be sure to share here for fun ha

Hi @Dr-Sassi, thank you for the response. I've attached a project file to better illustrate my question. The text spline is the emitter source, and the text in the volume builder is the object I'm trying to shape the emitted density to. For some reason, with my setup, the field force doesn't seem to affect the density/pyro at all.

Thanks!

PyroSmoke.c4d

Is it possible to use an object with field force so the density emitted from a pyro source takes on the shape of the object? Ive tried some possible techniques with the volume builder, but nothing seems to pull the density to the shape of a specific object. Is this possible or currently beyond the pyro capabilities in cinema 4D?

Thank you in advance!

Seun

Hello Dr. Sassi,

I agree, I feel like the random filling would be the best route.

I'm assuming on the first scene, you just created a long spline, tweaked some parameters, and let gravity pull it down into the sphere? I think that's probably the route I'd go for this animation. I guess now I'm just wondering if there's a way to get the same effect, without needing gravity as the force to pull the spline. Again, thanks for helping me troubleshoot this! This is very helpful.

Seun

This might also help: Here's the product page for the coil: https://www.stryker.com/us/en/neurovascular/products/target-tetra.html

You can see that the model isn't very complex, just the shape. And there's a sample video of it being used in real life at the bottom of the page. Clinically, it won't actually take on the tetra shape when it's deployed, it's close, but it ends up looking kind of random. But for the sake of animation, I'll need it to look like the tetra shape.

Hopefully that helps illustrate it needing to feel less like a snake moving along a path and more like it's a rigid wire being fed through a tube into a tight space.

@Dr-Sassi

Hello Dr. Sassi,

Thank you for responding and putting together this example project. I think what you have is a possible way of executing this, but I think the unique thing about the animation is that it's supposed to feel like the coil is being fed through a tube from the proximal end so it it bunches up in the sphere. So the distal tip of the coil does not continuously moving along the entire spline path. Does that makes sense? Ha

Here's a very old video that demonstrates the same motion: https://youtu.be/qcVdsLEqYqI?si=PBZ7_Y1yUU1VHVWJ&t=35

I've attached a example project with a dummy shape of coil.

3.5mm X6.c4d

I have CAD for the coil in it's final Tetra shape, but since it's a pretty simple model, my plan was to remodel it so it's uncoiled and completely straight to it's 6cm length, and then spline wrap it to the final spline animation/sim. I just need to figure out how to animate the spline like the reference videos.

Seun

Example video below:

https://drive.google.com/file/d/1M7FgWmEj6YZz4qG52Jq4UX3iEPKtI5h9/view?usp=sharing

I have a project where I need to animate a coil object like this so that when it deploys it conforms to a predetermined shape. It doesn't seem like C4D's spline wrap animation can achieve this kind of a result because of how it moves the source object through the spline. I need some kind of a technique that dynamically deploys the "spline object" but adheres to a fixed shape. I'm assuming it needs to be dynamic, but open to other solutions.

Thanks,

Seun

Thanks for the file Dr. Sassi. I appreciate you taking the time to look at this with me and troubleshooting it!

I'll look through this file and hopefully come out with a solution.

Thank you again!

Seun

@Dr-Sassi

Hello Dr. Sassi,

Thank you for taking the time to put this together. Yeah, it's different from my original execution, but I think I may be able to pull some ideas from your setup. Below is a link to a reference video that I got of the mechanical area of the product. Should explain why I had it the way I did haha (but clearly not working correctly)

https://drive.google.com/file/d/1Mj1f3qSwxuXsZVuPtpzKe25ixAD3dhmR/view?usp=sharing

Thanks!

Hey Dr. Sassi,

That looks correct. I originally reduced the file so I could upload here initially, but here's a more complete version:

https://drive.google.com/file/d/1YV2BRo7oIo4FL8XGiKM05cq41KprGsqy/view?usp=sharing

Thank you again!