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Mike B

3D Arching Exploration

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Here are several figures I made today that show the Betts Strad's back arching. These were taken from a video of a CT scan. The plots are in units of "voxels" and I've not converted them to something useful just yet. A photo of the Betts violin's back is included for comparison.

 

 

 

1666535339_bettsback.JPG.07fcb0dc6e2689d7cf1d646b8d20cb49.JPG

Betts with Lighting.jpg

Betts Point Cloud 1.jpg

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The first plot appears to my untrained eye to have a straight line from a point on the center line of the long arch just below the lower corners to a point near the start of the trough that is at the maximum distance from the start point.  Or is my imagination working overtime?  I believe that our famous French contributor shows that also.

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As for CG visualization - i think what would be very useful as a study aid is the kind of techniques automotive designers use to study the curvature of class A surfaces. In the old days you'd need tools like Alias to do this but now you can do it in any number of tools like Fusion (Free) or Rhino. 

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The real utility is that the images I provided can (and will) be 3D printed. This should be a useful study aid. In addition, corresponding arching templates can be machined, laser cut, or printed.

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On 10/19/2020 at 12:36 PM, Roger Hill said:

The first plot appears to my untrained eye to have a straight line from a point on the center line of the long arch just below the lower corners to a point near the start of the trough that is at the maximum distance from the start point.  Or is my imagination working overtime?  I believe that our famous French contributor shows that also.

That is a deep scratch of memory serves

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9 hours ago, Mike B said:

The real utility is that the images I provided can (and will) be 3D printed ...

I agree completely, but think there's a fair bit of value in an interactive 3D model - being able to interactively slice in x, y and z is something I find extremely useful. Have you looked at converting your Matlab-generated model to a web-friendly format, and getting it into the browser (and possibly sharing online)?

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