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Automatic orthographic to 3d model [message #63215] Mon, 04 March 2013 21:36 UTC Go to next message
avatar mlhaden  is currently offline mlhaden
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Registered: March 2011
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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?
Re: Automatic orthographic to 3d model [message #63223 is a reply to message #63215 ] Mon, 04 March 2013 22:20 UTC Go to previous messageGo to next message
avatar JACANT  is currently offline JACANT
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You could try http://www.123dapp.com/catch
You would need more than just the orthographic views.


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Re: Automatic orthographic to 3d model [message #63225 is a reply to message #63223 ] Mon, 04 March 2013 22:27 UTC Go to previous messageGo to next message
avatar UniverseBecoming is currently online UniverseBecoming
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The technical term for this is photogrammetry.




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James
Re: Automatic orthographic to 3d model [message #63227 is a reply to message #63223 ] Mon, 04 March 2013 22:34 UTC Go to previous messageGo to next message
avatar stonysmith is currently online stonysmith
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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.
index.php?t=getfile&id=28448&private=0
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 90 time(s))

[Updated on: Mon, 04 March 2013 22:36 UTC]


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Re: Automatic orthographic to 3d model [message #63237 is a reply to message #63227 ] Tue, 05 March 2013 00:27 UTC Go to previous messageGo to next message
avatar UniverseBecoming is currently online UniverseBecoming
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Adding to what Stony has said, there is one way that I know of to automatically do what he has described and that is by using Pixologic's ShadowBox command in Zbrush. It would come out looking exactly like Stony's image for a football, but it does it automatically using the three reference images. It also lets you make adjustments by drawing on the reference images and it updates whatever you draw in real time.

Then again, it doesn't take much effort to extrude and then make an intersection out of the three extrusions.




I prefer to know nothing about everything rather than everything about nothing.  

James
Re: Automatic orthographic to 3d model [message #63238 is a reply to message #63215 ] Tue, 05 March 2013 00:52 UTC Go to previous message
avatar GarySG  is currently offline GarySG
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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 Very Happy


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