hey luca,
not sure if this is at all relevant to your project, or maybe i'm not adding anything to the discussion because it's nothing new to you, but for a project with (slightly) similair demands, i remember the magic words were "structured light". google for that and you find a wealth of information. we ended up implementing a fully automated system; just drop the projectors and camera's loosely in place, hook them up, and press play: the system figures-out geometries and distances by itsself. \rri On Tue, Mar 30, 2010 at 12:30 PM, Stefan Kainbacher, NEON GOLDEN <[email protected]> wrote: > we implemented the paper on quartz composer. > first we wrote a applicaton with objective-c/open gl to do the calibration > and then we implemented it in qc with glsl > http://www.facebook.com/video/video.php?v=1387742499852 > the model and the 3d model have to mach as exact as possible > the higher the resolution the better the result > its also depending on the angle of the projecter / object ... the more depth > you have, the better it works ... > we just opend our first installation based on it, using a matrox tripplehead > and 3 projectors ... > http://www.facebook.com/album.php?aid=196408&id=66111817237 > best, stefan > > On Mar 29, 2010, at 4:28 PM, luca palmili wrote: > > Hi guys, > I'm trying to find a solution to match a projector output with a real 3D > object. I know that it is possible (look at this article for example > http://www.merl.com/papers/docs/TR2001-21.pdf), but I'd like to do it in QC. > You can also read this interesting solution using > http://vvvv.org/tiki-index.php?page=How+To+Project+On+3D+Geometry > I think the best solution is to write a custom patch using OpenGL and > OpenCV. My current approach is this: > > I write a stand-alone application using OpenGL and OpenCV. It implements the > POSIT algorithm (http://opencv.willowgarage.com/wiki/Posit) using webcam > input, and tries to match a projection of a 3D cube with a real one. > The POSIT algorithm (cvPOSIT function of the OpenCV library) takes in input > the focal lenght of the webcam, 3D object-coords of 4 non-co-planar point of > a cube, and their correspondent 2D coordinates in the webcam input (there is > a real cube in the scene), which is positioned over the projector (so as to > capture the same scene from the same point of view). > The POSIT algorithm outputs the opengl model-view (rotation, translation), > and projection matrix. > Then I write a custom GLSL shader in QC which use the same matix for the > projection of a cube. > > The result is not so perfect, but the cube is projected nearly in the right > place. > Is there someone how tried to do something similar? How can I improve my > workflow, so as to perfectly match the projected image with the real 3D > object? Are there in your opinion any additional step to take into account? > > Thank you! > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/stefan%40neongolden.net > > This email sent to [email protected] > > -- > NEW phone number: 0676 60 33 989 > > -- > NEON GOLDEN > VISUAL EXPERIMENT > lab.neongolden.net > -- > www.respectyourvj.net > > > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/arritjeparretjenof%40gmail.com > > This email sent to [email protected] > _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [email protected]
