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connect a null object to a selection tag?-possible
Posted: 24 November 2021 06:20 AM   [ Ignore ]  
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Hi again, Dr. Sassi, I want to use volume mesher to “erode” a portion of an object, and thought that I’d use a cube(rectangle)/spline wrap as a child to advance my cube along a spline, and have the front end of the cube ( rectangle really)  start to erode/cut out a portion of an object; is it possible to connect a null object to a selection on the cube in order to have another object’s end ” follow that null”? imagine a laser cutter cutting along a path;if I am not clear , maybe the attachement helps?

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Posted: 24 November 2021 08:33 AM   [ Ignore ]   [ # 1 ]  
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Hi Craig,

There is no attachment. I have sent you a Private Message with an upload link.

Cheers

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004

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Posted: 24 November 2021 09:18 AM   [ Ignore ]   [ # 2 ]  
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Thanks for the file, Craig.

Please have a look here:
https://www.amazon.com/clouddrive/share/vkatmJxsukQ0WpAnAv0hkjGpmNTWduNda9Hvsz16JD3
(Selection example included)

One idea is to place the item that subtracts things into a MoGraph Tracer and use the resulting Spline as a source to keep things “subtracted”. I’m happy to set up an example if you like.

Cheers

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Dr. Sassi V. Sassmannshausen Ph.D.
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Posted: 24 November 2021 09:32 AM   [ Ignore ]   [ # 3 ]  
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Thank you for this!!-yes, please would love to see what a mograph tracer option gives me-one thing though, why did you use Xpresso, need to figure out how to integrate that in my scene, can I do with out it? also, I can render a 12’ by 6’ scene in version 23?, thx

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Posted: 24 November 2021 10:00 AM   [ Ignore ]   [ # 4 ]  
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Hi Craig,

The question about the 12’ by 6’ is already answered here:
https://www.cineversity.com/forums/viewthread/5070/#20417
BTW, I have run a fast render in R23; as usual, I try not to answer from memory.

Here is the example
https://www.amazon.com/clouddrive/share/4B9PXamsg2HWj7gsJNaTMplMmPjrna1d40qHQolhOmi

Let me know if you have any questions about the setup. I’m happy to look into it.

Cheers

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Dr. Sassi V. Sassmannshausen Ph.D.
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Posted: 24 November 2021 10:22 AM   [ Ignore ]   [ # 5 ]  
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TThank you, but i do not see a selection tag-for my scene, I would just make the sphere invisible and make it a child of a long object, ie a pen tip, would that work? I just tried and it did not work, also the path of the sphere is keyframed?

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Posted: 24 November 2021 10:30 AM   [ Ignore ]   [ # 6 ]  
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Hi Craig,

The Sphere (or any object in the tracer list) will produce the path. This path (Spline[s]) can be used to create any object, like a Sweep. So we avoid the Selection or Xpresso entirely (as in the example above). (Sometimes, a rail path needs to be created as well, which can be done in the same way.)

I obviously miss something from your example scene. Would you mind elaborating a little bit more?

All the best

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004

Photography For C4D Artists: 200 Free Tutorials. Texture, Panorama, HDRI, Camera Projection, etc.
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Posted: 24 November 2021 10:41 AM   [ Ignore ]   [ # 7 ]  
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Sure, if you missed something, then I just didn’t explain it well enough ;:-I’m trying to ” erode away a tumor with a pen-like device, and this device moves , as if it is “painting away” the tumor, the devices moves, like you are painting, left-right, down a bit, left-right etc. The volume mesher solution i feel is good, unless you feel otherwise, the motion of the device will carve away the tumor if this is stil not clear, pls let me know, you are uber helpful to me as always

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Posted: 24 November 2021 10:55 AM   [ Ignore ]   [ # 8 ]  
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Thanks, Craig, I think I understood it correctly. Just to be sure.

If so, then this should express this understanding:
https://www.amazon.com/clouddrive/share/OZLXWCARyBUzoyzmal2h7G9rtxvQJuf6Yw5V4Od0qFg

Enjoy your project.

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Dr. Sassi V. Sassmannshausen Ph.D.
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Photography For C4D Artists: 200 Free Tutorials. Texture, Panorama, HDRI, Camera Projection, etc.
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Posted: 24 November 2021 11:22 AM   [ Ignore ]   [ # 9 ]  
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this is really great!-now I will analyze and refresh my memory about the tracer, since I have never used it, bless you, CZ

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Posted: 24 November 2021 11:24 AM   [ Ignore ]   [ # 10 ]  
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Craig, Thanks a lot. Please let me know if there is anything you like have, add, or any question.

Cheers

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Dr. Sassi V. Sassmannshausen Ph.D.
Cinema 4D Mentor since 2004

Photography For C4D Artists: 200 Free Tutorials. Texture, Panorama, HDRI, Camera Projection, etc.
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Posted: 24 November 2021 11:35 AM   [ Ignore ]   [ # 11 ]  
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actually I do have a question; regarding the tracer option, do I use autokeyframing to create my animate paths? if not how are they created, thx

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Posted: 24 November 2021 11:42 AM   [ Ignore ]   [ # 12 ]  
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Craig, the Pen in my example, holds the animation via keyframes. The Sphere is a child and follows.

The Sphere is inside of the Tracer. The Tracer sets by default for each position one point and extends the Resulting Spline, which is just the summary of that point collection. (If the Trace Vertices is not checked off, you will get for each point of the Sphere a Spline, which might be useful, but a lot of calculations.

I hope I got your question correctly; then there is no need to produce any keyframes for the Tracer.

Is that answering your question?

Cheers

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Dr. Sassi V. Sassmannshausen Ph.D.
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Posted: 24 November 2021 11:55 AM   [ Ignore ]   [ # 13 ]  
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Thx Dr. sassi, but I was not clear, if my client changes their mind, and I have to change the “pen” path, how do I do that? also, I have a much larger object, base model about 40,000 the volume mesher method is too prohibitive, size wise, any alternatives that you can think of? I appreciate it

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Posted: 24 November 2021 12:07 PM   [ Ignore ]   [ # 14 ]  
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Craig,

Each time, the path is generated so that any animation change will change the resulting Spline.

The pen is working on a small portion of the model if I get it correctly. That small portion is needed to be in a volume.

Alternative: The Collision Deformer (Which can be limited to an area, see Selection/restriction Tags

Example
https://www.amazon.com/clouddrive/share/aPgmoqpeeGkTHMR0KVcmstsYgr0NBPYeXDLsOXmPcWn

I exclude the PoseMorph/PoseMorph Deformer here, as you mentioned Client and changes. The Collision Deformer seems to be the tool then.

Stay safe!

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Dr. Sassi V. Sassmannshausen Ph.D.
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Posted: 24 November 2021 12:22 PM   [ Ignore ]   [ # 15 ]  
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thx for the collision deformer file, very nice- what if I decide to change the path of the pen and start fresh do I keyframe the path of the pen? or is the path created automatically when I start the the animation, and activate ” auto keyframing” sprry I am not clear

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