Does anyone know how they did the new iTunes efx? I have a client asking for that for a project.
1200 Firewire & 1080i cards installed
All DVCAM & Mini DV
Arri srII (16mm) Arri III (35mm) vp's & other lenses. Time lapse mitchells ... all in house
I think he's referring to the colored light trails in the new iPod Nano commercials. It's similar to the old flashlight/long-exposure trick of days gone by.
While it would be possible (but really tedious) to do the shots in a 3D compositor, I would guess the trails were generated in anapp like Maya. A 3D tracker like Boujou or PFTrack could be used to solve the path of movement, then you just run a surface along that path (with the appropriate streak texture). Even with that much automation, it would take a decent amound of hand-tweaking to ensure that the trail surface is properly oriented for twisting.
Combine all that with a bunch of roto, keying and color-correction, and you're golden ;)