How can i make this:

[RealThing]

They don't do this with hand held camera's. They use big camera dollies that can record and replay back movements.

[haitz]

and it is posible to make i want or not without that dolly cameras you named?
thanks :thumbsup:

[Phred42]

In the movies, they do their repeatable camera moves with motion control cameras like the Milo (http://www.mrmoco.com/Products/Rigs/milo.htm).

If you don't have the $$$ to rent a Milo (and let's be honest - who does?), you might try locking-off your camera. Set it up on a tripod, point where you want, start it shooting, and then don't touch it! Assuming there are no earthquakes, you can get a clean background plate pretty easily this way. It's not as sexy as if the camera were moving, but it's a heck of a lot easier and cheaper to deal with.

[jussing]

Originally posted by haitz
i want to record one person doing something in a real scene, but i want to take his movements as rotoscope to put on my 3d model, to do the same.the problem is that, i want to use the same background...
Why do you want to use the same background?

To me it sounds like you should do a REFERENCE PLATE with a locked-off camera, and use that as reference to animate your 3D model.

Then you make the real BACKGROUND PLATE without the actor, where you move your camera as you like, pretending to film the actor's performance. (test-shoot this a couple of times with the actor, so your camera operator will know the performance well enough to shoot it without the actor).

Then you get you hands on a tracking program (lots of threads about that in here), and track the camera movement on the background plate, render your 3D character with that camera, and composite him on to the background plate. E voila. No motion control.

Ciao,
- Jonas

[haitz]

ok, that is a way, but i have problems tracking the camera...:buttrock: , i use boujou as camera tracker, and xsi as cgi program, when i use the tracked camera animation in xsi, the cgi objects "wobble"(floats as in ungravity) and the track is well done... if you can help me... anyway thanks!!!:thumbsup: :wavey:

[jussing]

Well, tracking is a whole little science on its own... ;)

Most importantly: while you want to track on walls and all other objects, to keep perspective in the entire picture correct, you want to track points WHERE THE 3D MODEL WILL BE STANDING more than anything else.

If those points are tracked correctly, and if your 3D model is aligned to those points, then you'll do good.

So, summed up:
1) Track points on the floor, where your 3D model will be
2) In 3D, connect those points to build a floor (non-rendable)
3) Make sure your 3D model is standing/walking precisely on that floor.
4) render & composite!

- Jonas

[haitz]

but the problem is that the track is well done, i put a cgi object in boujou to test the tracking and the tracking is well done, the problem is that when i export to xsi, the cgi model is floating :cry:
:wavey:

[arvid]

Make sure your sequences start at the same frame, and are played in the same framerate. Just a thought :)

[haitz]

yep, the start and the end frame are the same, the framerate too, i hav tryed all, but cant do i well :shrug:
:wavey:

[jussing]

Hmm, I have no experience in either Boujou or XSI, so I can't really be helpful here... but I'll try a bit anyway...

If your tracking tests perfect in Boujou with Boujou's 3D object, but screws up in XSI, then I'd say the error is one of the following:

1) The export from Boujou screws up
2) The import into XSI screws up
3) You're not setting up the 3D correctly in XSI
4) You're not rendering correctly from XSI
5) You're not compositing correctly

No. 1 & 2 are quite out of my reach, and you already checked no. 4, right?

So, let's start with no. 5: You already checked framerates. How 'bout resolution? Square/nonsquare pixels?

Now for no. 3:

A) When you import to XSI, you're not only given a camera, but also a lot of points in space, right? This should be all the points you tracked in Boujou.

B) When you play the animation real-time in the XSI viewport (viewed through the Boujou-tracked camera, of course!), do the points LOOK LIKE they move like they do in the real background-clip? (ie: does it still look good here, or are the points screwed up at this stage?)
(NB! Maybe the points are OK, RELATIVE TO THE CAMERA, but not relative to your world coordinates -- if so, rotate ALL TRACKING DATA (camera + points) so the points on the floor are in a horizontal plane)

C) If the points look good, try placing a small renderable sphere on some of the points. Then render this, composite on background clip, and see if they "stay" on the points, or if they float.

Otherwise you're gonna have to show us some screenshots.

Good luck, and keep trying!! :)

Cheers,
- Jonas

[haitz]

the nulls that are supossed to be the reference point of the boujou camera tracking doesnt match with the rotoscope, both cameras are in pal 4/3 720x576...i dont know what am i doing wrong, and the people who use this two programs said that it goes well to them :buttrock:
very appreciated your replys :thumbsup: :wavey: :bowdown:

[jussing]

Well, sorry, then I can't do more. :shrug:
Originally posted by haitz
the people who use this two programs said that it goes well to them :buttrock:
Try asking them, then.

-You could also try to show us some screenshots, or start a new thread called "Boujou tracking problem". (there may be many Boujou experts here in CGTalk, who haven't read this thread because it's only entitled "How can I make this")

Cheers,
- Jonas

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