I was thinking more of a marker in the STL file, like those now being used
to denote STL Color. A single bit that would prompt an advisory that you are
about to infringe on a copyright if reproduced without authorization. like
the symbol used in text, At this juncture it is a "free for all" with 3D
Dimensional Digital Objects being traded like music and audio content on the
Web without royalty.......
Food for thought if StL is to remain the common denominator across platforms
and output devices.
Steven Adler CEO
Automated 3D Modeling
adler@a3dm.com
www.a3dm.com
----- Original Message -----
From: "Anshuman Razdan" <razdan@gloo3d.com>
To: "'Steven Adler'" <adler@a3dm.com>; <rp-ml@bart.lpt.fi>; "'Paul Finelt -
Optimum Online'" <finelt@optonline.net>
Sent: Monday, February 19, 2001 10:40 PM
Subject: RE: Mickey Mouse
> Steve et al.
> There is no robust method to watermarking STL files. Unlike 2D Images
where
> lower bits can be used to embed a signal without destroying the image, in
3D
> a) one loses accuracy and b) the problem is that almost all of the
> watermarking techniques can be defeated by retriangulation.
>
> 3D as you know has geometry and topology where as 2D images have implied
> topology (i.e. i-1,j the pixel will be next to i,j pixel) and just
geometry
> (intensity, color, etc.). So a 3D object (for lack of a better term) can
be
> retriangulated without changing the geometry of the object i.e. changing
the
> topology. For example lets say u have a rectangle (in 3D altho a rectangle
> is planar and 2Dish but bear with me for a moment). Now it has one
diagonal
> connoted such that there are two triangles. Now one can just switch the
> diagonal, maintain the same geometry and alter the topology.
>
> Watermarking algorithms rely on topology and few of them are robust when
it
> comes to scaling, rotation (etc. transformations) not breaking them. There
> have been some papers (and great interest) in this area but the final word
> has not been written yet.
>
> AR
> Dr Anshuman Razdan,
> Director PRISM
> MC 5906, GWC 574
> Arizona State University
> Tempe AZ 85287
> http://prism.asu.edu/~razdan
> 480 965 0483 (Tina)
>
>
>
> >> -----Original Message-----
> >> From: owner-rp-ml@ltk.hut.fi
> >> [mailto:owner-rp-ml@ltk.hut.fi]On Behalf Of
> >> Steven Adler
> >> Sent: Monday, February 19, 2001 2:52 PM
> >> To: rp-ml@bart.lpt.fi; Paul Finelt - Optimum Online
> >> Subject: Re: Mickey Mouse
> >>
> >>
> >> Thank you Paul...... I was thinking the same thing. Is there
> >> a method to
> >> "watermark" or "copyright" an STL file......?
> >>
> >> Why not incorporate a disclosure statement on opening
> >> "watermarked" STL
> >> files advising copyrights.....?
> >>
> >> Steven Adler CEO
> >> Automated 3D Modeling
> >> adler@a3dm.com
> >> www.a3dm.com
> >> ----- Original Message -----
> >> From: "Paul Finelt - Optimum Online" <finelt@optonline.net>
> >> To: <A.gerrits@ind.tno.nl>; <rp-ml@bart.lpt.fi>
> >> Sent: Monday, February 19, 2001 4:53 PM
> >> Subject: RE: Mickey Mouse
> >>
> >>
> >> > Anyone supplying an STL of Mickey Mouse or any other copywritten or
> >> > trademarked likeness of any character.....
> >> >
> >> > Don't send these things around. Disney and other owners of these
> >> properties
> >> > will sue you or at least make your life miserable for a
> >> period of time.
> >> >
> >> > Even if you think you're just using it for your own
> >> purposes. These are
> >> > commercial entities with substantial value. The owners of
> >> these guys are
> >> > serious.
> >> >
> >> > I know some people that have found out the hard way.
> >> >
> >> >
> >> > -----Original Message-----
> >> > From: owner-rp-ml@ltk.hut.fi
> [mailto:owner-rp-ml@ltk.hut.fi]On Behalf Of
> > A.gerrits@ind.tno.nl
> > Sent: Monday, February 19, 2001 8:49 AM
> > To: rp-ml@ltk.hut.fi
> > Subject: Mickey Mouse
> >
> >
> > Dear rapid people,
> >
> > Who has an STL file of Mickey ??
> > We want to thank a good relation who would go crazy with a nice
prototype.
> >
> > Thanks in advance for your help.
> >
> > Best regards,
> >
> > Anton Gerrits
> >
> > TNO Industrial Technology
> > Department Industrial Prototyping
> > De Rondom 1, P.O. Box 6235, 5600 HE Eindhoven (The
> > Netherlands)
> > Telephone (+31) 040-26 50 608, fax (+31) 040-26 50 678
> > Mobile (+31) 06-23 11 53 97
> > E-mail a.gerrits@ind.tno.nl <mailto:a.gerrits@ind.tno.nl>
> > Look also at
> > http://www.ind.tno.nl/en/productiondevelopment/prototyping/index.html
> > <http://www.ind.tno.nl/en/productiondevelopment/prototyping/index.html>
> >
> > For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
> >
> >
> > For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
> >
>
>
> For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
>
>
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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