transfer 3-D films

[motleycool]

can I make a dvd copy of a dvd 3-D movie?

[mats.hogberg]

If it's a Video DVD it can be copied, yes. There's no special 3D DVD format.

/Mats

[guns1inger]

However you will still need 3-D glasses to view it in 3D.

[Cornucopia]

Well, I'm going to come a little out of secrecy with this here--I've developed a "special" Stereo3D DVD/HDDVD/BD format that is backwards compatible and also master quality (AT LEAST equivalent to 2D version) and also capable of multiple viewing formats. More on that later...

The main thing is, "what's it mean to have a 'special' 3D format?"
Most 3D formats currently available to the consumer aren't "special" in terms of player requirements. But this seeming ease with playback also adds to the confusion for consumers--how do you easily watch a "3D" movie if you don't have the corresponding viewing format, or how can you easily watch it in 2D when you are only in the mood for a standard setup (like many guests coming over)?
The 3 current main DVD presentation formats for Stereo3D are:
1. Anaglyph (Left-eye-view--shown in RED only, superimposed on Right-eye-view--shown in CYAN only, onto standard viewing window).
2. Interlaced (Left-eye-view--shown in ODD scanlines, Right-eye-view--shown in EVEN scanlines, onto standard interlaced viewing window).
3. "Sensio" (Left and Right eye-views positioned side-by-side, but squeezed 2:1 anamorphically in Horiz direction to fit onto standard viewing window).

A better scenario would be to use "Standard" vs. "Enhanced" players, where a standard player only shows in 2D, but an enhanced player can not only show in 2D or 3D, but also in a variety of viewing formats (Anaglyph, Passive Polarized, Active LCD shutter, HMD, etc). There currently are a few very good PC-based player apps that can do this, my favorite being Stereoscopic Player. Soon there should also be settop hardware-based players that will do the equivalent.
This is analogous to the way a 2-channel only DVD player will still play a 5.1 Surround AC3 movie, but just play it in stereo, where that same disc will play in 4.0, 5.0, 5.1, 6.1 in an "enhanced" player/receiver/exhibition setup. And without media duplication and REDUNDANCY.

...
But back to the OP's question:
Since the current major formats are really just "pre-processed" onto a standard 2D window, making a copy is easy. All you have to do is NOT mess with the format internally (by re-encoding, re-processing, etc). This means:
1. Don't mess with color space or hue/sat/white balance in Anaglyph discs.
2. Don't mess with the interlacing (either via IVTC or Deinterlacing) AT ALL on Interlaced discs.
3. Don't change the AR on Sensio discs.

Simple 1:1 disc (or ISO) copies should be fine.

Scott