[Bf-committers] Re: 2d Image to 3d?

[Austin Benesh]

Here is one thought that may seem to work. Regarding the blueprints from www.suurland.com<about:blank>, they are all orthographic, which can help tremendously. In my examples below (forgive my sloppy drawing) you can see how a grid of "lines" across each view (top, side, front too, just got lazy) makes a shape for each view. They then could use Boolean logic to combine them together. You'd at least end up with a start of a car. Any thoughts on this?

(I had images, but they took up too much space. I might try resending them...)
  ----- Original Message ----- 
  From: GSR - FR<mailto:famrom at infernal-iceberg.com> 
  To: bf-committers at projects.blender.org<mailto:bf-committers at projects.blender.org> 
  Sent: Wednesday, February 16, 2005 11:54 AM
  Subject: [Bf-committers] Re: 2d Image to 3d?


  Hi,
  desoto at blender.spaceisbig.com<mailto:desoto at blender.spaceisbig.com> (2005-02-15 at 2220.17 -0500):
  > For once Alex is totally wrong here...
  > http://www.graphics.cornell.edu/workshop/talks/acquisition/debevec.pdf<http://www.graphics.cornell.edu/workshop/talks/acquisition/debevec.pdf>
  > Alexander Ewering wrote:
  > > On Tue, 15 Feb 2005, Austin Benesh wrote:
  > >> Would it be too much work to write a sub-routine that takes three 
  > >> parts of
  > >> an orthographic image (top, bottom, side) and turns them into a mesh? 
  > >> Would
  > >> it even be possible?
  > > What you are asking for is mathematically impossible.

  They talk about lots of samples from different angles (not just 3) or
  even laser (to get depth directly), so then you can get the reasonable
  guess of geometry. They talk about stereo vision to get colour and
  depth. They talk about user intervention too to get info about
  matching edges (not so auto then). But no three view blueprint (most
  probably meaning of the request) to mesh anywhere.

  So lets take the car blueprint I suggested (which lacks hidden lines
  in the wheels area, btw). A and A' are easy, at least graphically,
  dunno how hard would it be in code. Once you have that point in 2
  views, you have the XYZ. But given B, could somebody determine B'?
  http://www.infernal-iceberg.com/blender/audi-tt-points.png<http://www.infernal-iceberg.com/blender/audi-tt-points.png>

  Probably the best you can get is the cookie cutter solution already
  proposed. Maybe with some kind of shading images (lights, helping
  pattern) the system could guess but then you are adding extra
  conditions. For the general case it is impossible to have something
  that can guess, discarding precission errors, the original object
  always.

  GSR
   
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