| Automatic orthographic to 3d model [message #63215] Mon, 04 March 2013 21:36 UTC |
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I've seen plenty of 3d modeling programs that are able to take an existing 3d model and produce orthographic views.
Does there exist an algorithm that lets you classify the front, back, top, bottom, left & right of a photo or drawing that recreates a 3d representation of those orthographic views?
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| Re: Automatic orthographic to 3d model [message #63227 is a reply to message #63223 ] Mon, 04 March 2013 22:34 UTC |
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Overall, the answer is "no". There's not enough information in the orthographic views. It's a subject I've chased for 30+ years.
The core issue is that an orthographic view will not properly represent any concave surfaces.
On the other hand, a large number of models in my shop were built (by hand) from nothing more than the orthographic views.
I convert the bitmaps to vector drawings using Corel or Inkscape, then import the 3 views into (editor of my choice) and go to work extruding and intersecting.
If you take the trivial example of a football.. the 3 view would be two ovals and a circle.
If you simply extrude those and then apply a "intersection" operator, this is what you are left with.
Now, if you can obtain slices... where you have many more than just 3 views.. you might get somewhere.
I built this model using such a method, because I had the cross sections:
Attachment: football.jpg
(Size: 49.58KB, Downloaded 85 time(s))
[Updated on: Mon, 04 March 2013 22:36 UTC]
Patience, Persistance, Politeness - the 3Ps will help us get us to Perfect Printed Products
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| Re: Automatic orthographic to 3d model [message #63238 is a reply to message #63215 ] Tue, 05 March 2013 00:52 UTC |
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Check out 123D by Autodesk. You won't get away with using just those views, but it will convert images into a 3D model if you have enough of them of good quality 
"Hm, I'm so hungry I could eat an entire cow. Gerard, fire up the printer!"
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