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View Full Version : photogrammetry question

reddog708
03-05-2006, 02:15 AM
I was wondering if anyone knew how to recreate the effect in this commercial.

http://www.spreadtheknow.com/

I believe software like Image Modeler is used, but not sure. I talked to one of the cameramen who worked on this who wasn't sure how it was done, but 3 cameras were set up shooting timelapse simultaneously, and some type of software created the inbetween movement. it looks smooth and unwarped, so I was curious if Image Modeler could create an environment to move between 2 or more photos in a 3D application, and then perhaps 2 camera mapped textures are blended during the movement onto geometry. Anyone have any ideas?
Marcel
03-06-2006, 10:06 AM
If I had to guess I would think it's just a motion controlled camera.
I don't see how you can recreate the camera movement with the people moving in the shot using photogrammetry (or why, if you can just use a motioncontrolled camera).
reddog708
03-07-2006, 07:17 AM
well I know for sure there was no motion control. The budget was super low and filming was guerilla style. 3 different locked off cameras shot timelapse simultaneously, and whatever created the in betweens was all done in post, which is what I find amazing about it, as well as baffled. Anyone else have any ideas?
Bonedaddy
03-07-2006, 07:49 AM
Given three cameras and the fact that none of the people stand still long enough to give away any parallax glitches, yes, it could be photogrammetry. If so, they probably moved the cameras around during the actual painting, though, in order to be able to get enough data for the longer shots. Imagemodeler could do that, as would pretty much any major 3d program (maya, max, xsi). You can blend between the two using a blend/multiply node, or bodypaint, or even do it in compositing -- render out three different passes with three different textures, and blend in Shake or AFX as needed.


I would have guessed it more to be moco, though. Doing it in post seems wasteful.
jasonsco
03-08-2006, 01:18 AM
Ah, you wonderful 3D people . . . think 2D (especially you, Bonedaddy . . . I'm almost ashamed to know you) . . . you don't need photogrammetry or motion control at all. I wish I could slow it down (anybody just have a Quicktime?), but I believe it's just morphed footage. People have been doing this for years. Morphing programs are cheap, calculate fast, and easy to use. And yes, you can morph images from different angles to make it look like the camera is moving.
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