3D Renderings of the 1956-D Mintmark

[ray_parkhurst]

Cross-eye 3D renderings at 10X magnification from 3 perspectives:







I will try this again with an RPM...Ray

[Scott99]

Interesting. Did you do that with a displacement map created from your image or did you buy that expensive 3d microscope?

[ray_parkhurst]

I thought about finally getting the microscope, but I'd have to take out a second mortgage (not on my house, but on the "Luxury Bishop" house) to buy it. So I settled on using cheap software...Ray

[Joe2758]

lol @ luxury bishop house

[LKLive13]

Awesome pics! I would like to see what one of the good strong 50s RPMs look like!

[kloccwork419]

What program?. 3d sweep?

[ray_parkhurst]

I figure the 3D stuff is a bit gimmicky, but it might actually be useful to view an RPM at high magnification from multiple angles even if the images are not in stereo. I do this when I am attributing using stereo microscope. Here are images of a BU 1956-D RPM#1 from 3:00, 6:00, 9:00, 10:00 (and magnified a bit), and 12:00.

[jallengomez]

The images are certainly good for showing the difference between MD and a doubled die or RPM.

[ray_parkhurst]

Here's a stereo pair:

[Peter]

How accurate of a representation do you think this technique offers? Isn't information extrapolated, then interpreted to the best of the programs ability, and then rendered? For instance, the top and bottom left serifs of the D look very different to me in 3D then the original straight on non 3-D version. Curious what others think.

[ray_parkhurst]

There's minimal interpolation / extrapolation going on here. The depth map information is accurate to a few microns.

[jcuve]

Interesting Ray. I suppose it could be used in the aid of diagnosing or debunking a difficult variety. But for practical purposes it doesn't seem to add much. It does remind me that it would be nice to have a VEDS representation of a few specific mintmarks that could then be sent to a 3d printer. After a little hand re-manipulation to make it a little closer, one might be able to cast the final product in something a little harder and do some RPM experiments in a soft material. The results might be helpful - or waste of time.

[ray_parkhurst]

Well, I've never even figured out how to do overlays yet so I will leave the 3D printing to you. If you want to try something like that, let me know. I could look for a well-punched EDS coin to test the concept on, or you could send me one. Getting the CNC info to the printer might be interesting. The program I used to generate these has a 3D model export function so I'd bet that could be hacked to work with a 3D printer.

[ray_parkhurst]

Here's a less dramatic but less common RPM...1956-D RPM#4 in single view and stereo:

[ray_parkhurst]

And here is an extreme side view to show the limits of the technique: