(2011-3-17: this is a temporary crappy data dump of a sketch of a web page - to frighten me into putting more time into the website)
1.BUY::Projector, Optitrack, Home Depot, Computer, (optional)
2.BUILD:: 1 base , 4 posts, 6 supports , 3 reinforce , 1 display frame , 1 projection surface , ? IR LEDs, 1 shell, (optional)
3.DRIVE:: OptiTrack SDK, Unity3D, windows7 mice inputs, background visual studio app, ...
4.APPS:: drawing, chess, arduino robots, (optional), ...
INFINTE IR LEDs ?!?
Inadequate and uneven Infra-Red illumination.
solder together a grid of IR LEDs, to evenly illuminate the display surface, without causing blown out reflection spots, or blocking camera (or Dell Projector's color image)
1) try moving TrackIR around (4 LEDs inside) to see how well it illuminates finger blobs at various distances and angles.
2) write up plan and diagram (2" gaps? 4"?) - send to Jim, Hugo, and Ed. Make sure they don't see scary errors. Maybe they'll have advice?
3) Dig up the old blog that explained how to solder your own LED chain (for Diffused Surface Illumination setup). hit radio shack and buy a few different IR LEDs and whatever else. build a bar and see how it works. then maybe buy a bunch of IR LEDs in bulk.
- the OptiTrack V100 (discontinued) hardware has a built-in ring of Infra-Red Light Emitting Diodes which are too close together. Laid flat on the base, about 27.5 inches from the glass sheet, they cause a concentrated reflection (and so far, no amount of software slider adjustment can get rid of the resulting "blown-out donut" area).
Plus there's a very quick falloff outside the ring, of maybe 3 inches tops. I can see fingers through the Vellum in a very small ring area outside the blown-out-donut, but it allows for about an inch of movement.
- The Optitrack V100 camera only has a 46 degree FOV lens. The blown-out donut eats most of the middle of the image. Outside the fast falloff area, most of the camera's Field Of View goes unused.
Ultimately I need a 66 degree FOV lens, to see the entire projected image area. So I need t figure out a way to fill this area with IR light, without causing blowouts.
- TrackIR's 4 LEDs only illuminate fingers about 3 inches away. no idea what FOV lens(?) is at. is there a lens? (does there have to be one? is this a stupid question?)
Still curious if TrackIR camera can catch reflected IR light as well as Optitrack V100. it clearly has fewer sliders available in sample app (certain things can't be adjusted).
- maybe try front projection Diffused Surface Illumination? (wrap LEDs around the four post tops? or around top of vellum?
snazzy overview text here...