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

[Jeremy Wall]

Actually for certain shapes this would work quite well. you could even
put in the python script the ability to draw the outlines from the
images yourself. Many commercial programs take this approach to the
problem using hand drawn curves over a set of images and then
extrapolating the 3-d image. Shapes with a lot of curvature however
will not work will with this method. So organic modelling is out.
Architecture, and mecanical modelling would be possible this way
though. At least as a starting point.

On Wed, 16 Feb 2005 17:17:44 -0700, Austin Benesh <doccoaster at msn.com> wrote:
>  
>  
> Here is one thought that may seem to work. Regarding the blueprints from
> www.suurland.com, 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 
> To: bf-committers at projectsblender.org 
> Sent: Wednesday, February 16, 2005 11:54 AM 
> Subject: [Bf-committers] Re: 2d Image to 3d? 
> 
> Hi,
> 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/debevecpdf
> 
> > 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
> 
> 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
>  
> -- 
> Food and mails? http://en.wikipedia.org/wiki/TOFU
>  
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