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
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