Hi Martin,

> I just wondered if there was a part of the file header that could be encrypted
> and thus be hidden from prying eyes.

There's currently no mechanism in the 3DM file format for encrypting that particular header information, for a major change in the 3DM format itself you'd probably want to ask the Rhino guys about making any changes in that area, they're the ones that make the 3DM file toolkit for reading and writing 3DM files.

It is possible to put in custom chunks of application or plug-in specific data into 3DM files, so it could be possible to store encrypted information into the file that way, but it would be separate from the standard author header field and no other programs that read 3DM files would know how to do anything with that information and would just skip it...

- Michael

Hi Michael - you're up early or very late :)

Thanks for the reply ... speedy as usual

>>It is possible to put in custom chunks of application or plug-in specific data into 3DM files, so it could be possible to store encrypted information into the file that way, but it would be separate from the standard author header field and no other programs that read 3DM files would know how to do anything with that information and would just skip it...<<

That's cool, I will have a natter with the guys at rhino ... It's just for copyright dates and times more than anything, so even the creators name is not that important, but would add a little extra to the evidence side of things should it ever be needed, and as such, third party applications should be leaving it intact or ignoring it anyway so the chain of creation times does not get broken.

Many thanks for your time Michael ...

Martin Spencer-Ford

write your name at something like .00005 and place it into the model in some inconspicuous place. :o

Hi Burr, that actually might not a bad way to do it, putting it in as actual geometry could then have a greater possibility of actually coming through different types of file exports like STEP or IGES transfers too...

- Michael

Ah Burman - you're a star ... never even thought of that one either - Damn i am getting old


Martin Spencer-Ford

Yeah, or "3 points at 6 miles away!!!" lol

Maybe we can start a thread about the best way to "stamp" a model in such a way... Maybe you could think about if theres a way to do some type of micro geometry stamp from your side Michael?

Anyway.... This was a new twist. Usually the chinese hacker websites are stealing stuff and giving it away for free!!! People are weird.

Strange what some folks will do for a little "Kudos" ... I know they are behind another great wall, but at least pass it on in the same spirit as it was given - But i love that scale to real size ratio, you'd need some real good eyes to see that!

Martin Spencer-Ford

Hi Burr,

> Maybe you could think about if theres a way to do some type of micro geometry
> stamp from your side Michael?

Nothing really comes to mind that would be any different than just creating text and just scaling it down...

Do you mean something like apply the text as some kind of invisible watermark? I guess it could be possible to encode information in different ways but the good thing about just having plain curves is that any program that displays the geometry would work to see the text just if they know where to go zoom in on.

- Michael

steganography galore!

https://en.wikipedia.org/wiki/Steganography




fortunately, we don't have any forum avatars in here :P..but the whole process is rather intriguing. this will be a big thing in the upcoming 3d-printing vs copyrights war(s).

I was thinking more that just free floating text could get left by some type of tranform.

I was wondering about a "stamp" that could localize enough resolution to perform the action at such a small scale. Like, enter the text, then, wherever you pick a point, the bounds of the text, at some miniscule scale, would allow the density/resolution, to perform the action. The text would need to be "attached" to the model somehow. I was considering that "super minuscule numbers" wouldnt boolean and such. Or, how could you join just curves to a solid, like trim them into the surface...

Maybe just "scale the model by 1000 times, then boolean text and scale it back down?

If your text is in the faraway space
Make in the 3 views : Select visible objects / Inverse Selection/ erase

- if your your text is not an object
Select all Objects / inverse selection / erase

if your text is an object it's appear in the Browser!
So easy to earase it :)

etc...

You are trapped in any case! :)

Hi Frenchy - You could for instance make the tiny copyright notice in the tire tread of a car model or on the windscreen etc, if they don't know it's there and it's part of the model and on the appropriate layer they would never find it unless they knew exactly where you placed it. Remember the old saying, the best way to hide something is to leave it in plain sight

Martin Spencer-Ford

Here's a cube. Nothing up my sleeve!

"Meshing" looses it. Probably wont be any "catch all"

the best way to hide something is to leave it in plain sight

It's The Purloined Letter by Edgar Poe! :)

lol. sorry Frenchy....

Front view, lower left corner.

The cube scaled by 1000 times, then the text at .1 height added and booleaned on (I was trying to boolean text at .0001 height, but no go) then scaled back by .0001.

@ Buur
You must put your Moi inside because now your cube is not on the origine! :)

And if you explode all or just select "Faces" you obtain 29 surfaces! So something is curious for this cube! :)

Touché..............

Better........... I think I got it where it just about clips out of view if you get close enough to see it....

Although this would make it difficult, if not impossible to get a manifold mesh for printing.....

I believe that is not a good idea!

When you will make a Snap to the corner of this cube, if you don't care of the Name of the snap you will have all chance to snap on a numerous points of your "hidden" signature!
So false constructions in perspective! :)

And the numbers of surfaces & or Edges is always a revelatory of something wrong! :)

Code an hidden signature inside a texture seems very more powerful! :)

It was I who requested an anonymizing feature in the Rhino header block. I've written a special program to purge those, but it's not automatic.

Perhaps the most flexible approach is an edit field under Options?