This secret to control point splines changes everything | Mastering guitar neck profiles.
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- เผยแพร่เมื่อ 5 มิ.ย. 2024
- Today we go in depth about the fundamentals of how to create and define control point splines in Autodesk Fusion 360 so that we can create better and more comfortable neck profiles for guitars. It turns out that control point splines are quadratic and cubic Bezier curves... which means they are fairly elegant to constrain if you recreate the geometry that generate them.
Much of my understanding of this concept is thanks to Freya Holmér's amazing video titled "The Beauty of Bézier Curves". You can find her video here:
Freya Holmér's Channel:
/ @acegikmo
The Beauty of Bézier Curves
• The Beauty of Bézier C...
Check out my previous video on why I rarely use splines:
Splines are overrated:
• Splines are overrated....
Discord Server: Come chat with me and other viewers!
/ discord
Support me on Patreon: / austinshaner
0:00 Introduction
2:09 Anatomy of Control Point Splines (Quadratic & Cubic Bézier Curves)
17:21 Creating Symmetric Neck Profiles
23:02 Evaluating Curvature & Creating G2 Connections to the Fretboard.
26:52 Creating Asymmetric Neck Profiles
31:00 Splitting Surfaces to Prepare for Headstock and Heel Transitions
32:31 Final Thoughts
If you like this video or want to learn more in Fusion 360; please like, comment, and subscribe to not miss any future videos!
Thank you!
#Fusion360 #CNC #Guitars - แนวปฏิบัติและการใช้ชีวิต
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Austin, te magnitude of your contribution with these videos to the luthier world is gigantic. It's a dream come true to luthier begginers because it addresses exactly what we need to know and the learning curve is less steep. Thankyou
Thank you so much Dany. That is incredibly kind of you. I'm less of a luthier and more of a 3d modeling nerd, but I'm grateful that my content has been received so well by the luthier community. I somewhat expected a huge amount of criticism when I first started. Haha
I second that
Austin, I can’t begin to express what a monumental service you are providing to the luthier community. Thank you thank you thank you for your generosity! I am in awe!
Sometimes a lesson needs a subject, regardless how irrelevant to your career it is. This is exactly the case and should be a default lesson when it comes to splines.
Thank you so much for all of your videos!
Another awesome video! This was incredibly useful, thank you!
Great and very interesting and helpfull as usual! :)
Another very valuable video. Thanks Austin!
Very informative video. Thanks for sharing.
Thanks for the pedagogical instruction!
Very good job. Thank you.
Wow! this is very very clever and usefull. Thanks. You are awesome.
Austin your channel is nothing short of amazing. I started to learn Inventor so that I had more control and easy repeatability with Guitar construction. You have opened my eyes fully to the power inside Fusion and infinitely dramatically reduced the sketches and procedures to drawing a guitar for construction, while providing methods to constrain sketches and functions throughout. Your contribution to guitar construction is ginormous. Best guitar construction in Fusion by light years. I have been pondering these problems for ages and haven’t come anywhere close to your solutions. Austin you are the god of Fusion 360 that luthiers have been looking for. Best Patreon I’ve ever backed. Clearly I know very little of the power of Fusion unlike yourself. Keep up the amazing work my friend. Wished I lived in your part of the world as I’d like to buy you a beer or ten. You rock 🤘🏻🤘🏻🤘🏻🤘🏻
Austin, Once again your timing on this is incredible (for me). Thank you for a very good and timely video.
Dude, thank you for this video, I love the way you present the information, very relaxed understandable and down to earth! I am learning a lot.
Absolutely brilliant Austin. You're a born teacher. Key strokes info would be a great addition for me as I have so much to learn and so little time🙂 I'm playing the video at half speed to try and keep up.
Good stuff! You’re definitely putting in the work. That is some seriously new growth wood , 2 lines per inch, and heartwood. Just teasing
really helpful！
This is a timely video for me too. I recently did a video on a pencil holder where I did a circular pattern of fit point splines. It was pointed out to me that patterned instances of fit point splines do not update when the seed spline is changed! This was kind of a shock to me. But patterning control point splines does not have this issue. I was planning to do a video as a follow up and was looking for some videos to learn more about control point splines and was pleasantly surprised by this. I have definitely drawn some inspiration from this. Will definitely credit you in my follow up video. I have to say, you know your geometry!!!
Thank you so much mate! It's odd for me to hear that i know my geometry as I flunked almost every math class I ever took in school. But I've grown a lot since then!
I didn't know that patterned fit point splines don't update parametrically. That's very useful to know. I do know that fit point splines operate on a similar principle to bezier curves, but seem to be different enough to not be as predictable. I wanted to include information on them in this video but it's been difficult to find info online for exactly how they work under the hood.
I look forward to your video! Feel free to clip anything you need from this video if you need to. 😀
I would love to see you make a five string banjo next using this process!
you are awesome! you are different
Just awesome, thanks so much 👍🙏
Question how do you do parametric fretboard work this way that would really be great to learn. I went to your website, does this have more content vs on your youtube channel pr are these essentially the same videos ? thanks again
Hey Hans!
If you watch my "Parametric Design Intent" video i go into how to add user parameters to control your models/sketches. After that it's simply typing in your standard fret spacing formula to calculate each fret. Then go and link those parameters to your fretboard sketch.
I'll likely do a video on it at some point as this is the second time someone has asked me this question!
There are no videos posted on my Patreon, only my youtube channel. Patreon is where i receive donations and post my Fusion files featured in each video for people to download and play around with.
@@austinshaner thanks so much for the feedback Austin, I really love this kind of videos so complete and detailed I learned a lot in already a few minutes, I'll check your website, this is really awesome stuff! 🙏🙏
👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍 Thank YOU
Hi Austin, thanks for the video. I found it super helpful. One thing I running into is how to create a helper surface for the headstock transition using this method to draw the neck profile. As it's not a 3-point arc, do you have any thoughts on how best to create the necessary helper surface for my headstock transition?
Hey Lewis!
There are two helper surfaces generated from the neck profile. The first one would be the neck itself in which you can simply split the face like I show at the end of this video. The second is the "dangling" surface I used to extend that curvature to the nut.
For that one, if you are using a cubic bezier that is tangent or g2 to the fretboard, you can simply use a straight line instead of an arc to generate a vertical surface to reference.. I created a dangling arc because mine did not come tangent to the fretboard
@@austinshaner That makes sense! I'll give that a try. Thanks Austin!
For Some reason it won't let me set a multiplying dimension off of the first 1inch using the T-value parameters, it'll let me dimension off of the 1inch dimension by *.25 just not using the parameters to do so, not sure what going on... I ended up dimensioning a 1 inch parameter separately then set that for the first line then I used that parameter to tell a new parameter to calculate it (that 1inch parameter) by *.25 and used that new parameter to drive the construction line tangency, hoping it work and won't lead to issue down the road.
Austin I wonder if you can show how you made the Engine/model of the fretboard you used to construct the neck please that looks a great tool to have? Thank you 👍🏼
Aq few people have requested it, so I may cover it in the future! But it's basically just parametric formulas in the user parameters
@@austinshaner 😊 Aah?.......... what you said? So wish this had been around 60 years ago when I was at school Austin, this old fogey has got a real lot of catching up to do my friend🤣
Not sure why you changed the asymmetrical from one end vs the other. Wouldn’t you want the asymmetrical shape (direction) to be the same on both ends?
This is great. I was trying to get that wolfgang neck profile and this is surely the way to go.
By the way Austin, how do the true 3D modeling sorcerers like yourself approach arch/carve tops? After finally finishing my strat project I'm giving the Les Paul a go so I get the basics out of the way.
Hello Felix,
I'm still working on developing a reliable method for an Archtop. Mattia from my discord Server has gotten very close but it is definitely not a basic model, infact one of the more complex ones to approach with its subtle, but iconic, shape
@@austinshaner I'll be very interested to see it when you are done. I've been modeling a PRS style body in Rhino for about 15 years. It's fine, but has limitations. I'm very interested to take it to a new level.
@@austinshaner Interesting, would love to see your approach compared to mine. :)
Austin,
I have access to Autodesk Powershape. Do you know if this is possible to do in that software?
I do not know this program well enough to confirm that. But this function of bezier curves remains true across any platform, but whether or not you can utilize it in this way I don't know.
Question from a noob. What exactly do you get from having everything dimensioned? The angle of the asymmetrical shape etc. If these dimensions are undefined will things go goofy when it comes time to throw some wood at the cnc? I'm not sure what cad softwares can 'infer' without being told every single dimension, I assume it just kind of inherently knows what's going on based on other more simple dimensions
It's good design practice to fully define your sketches. There are many reasons, but the primary one in my opinion is because it makes your timeline more stable. Fusion knows where the sketch exists in space, but without being fully defined, it doesn't know that it needs to remain in that position should something change. So for example, if you had an undefined sketch that is driving an extrude or loft feature, and later down the road you wanted to change something, your sketch may go haywire and produce incorrect geometry. The other elements of your design was able to move that sketch because you didn't tell fusion that it needed to stay put, or how long that line needs to be, or radius etc.
Hopefully that makes sense
@@austinshaner Hey thanks so much, that totally makes sense! I'll keep plugging along on my guitars and see what happens come prototype time. Hope to have a working proto soon!
WAY COOL! But my bandmates wont be happy if I spend more time practicing splines instead of practicing guitar!!
Control point splines in Fusin 360 are NOT Bezier Splines, they a B-Splines, NURBS to be precise. Only when a B-Spline uses a number of control points that is +1 the degree of the curve is that mathematically equivalent to a Bezier Spline. A 5-Degree B-Spline with 6 Control points is also called a single-span B-spline and that is mathematically equivalent to a 5-degree Bezier spline. If more than 6 points are used in a 5-degree B-Spline then that creates a 5-degree multi-span spline.