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Lightstrive

Lightstrive - an interactive light projection

As part of the Catch the Light program accompanying the olympic games in Athens in August 2004 we've been invited to realize one of the 9 installations that have been setup throughout the city.

The fassade of a building is illuminated by a virtual lightsource that can be played with like a ball thus creating different lighting for the fassade every moment.

Team

  • Michael Höpfel
  • Sebastian Gregor
  • joreg

Additional credits go to Michael Mehling for last minute programming at meso, Michael Mehling and Jenny Michel for their help on setting up the hardware and to Adi and Marianna as our fabulous production team in Athens.

Further documentation on:

Movie

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Making Of

Lightstrive is completely realized with our inhouse developed graphical programming language vvvv and runs on two standard windows pcs with current graphics hardware.

The audience is being tracked by a low latency firewire camera mounted high above on the opposite building viewing the whole interactive zone of about 22m. Direction and power of the users movement is extracted by analysing the video over time. A resulting vector is used to update the lights/balls movement that is otherwise being calculated by a physics engine that also includes the facades geometry in its calculations. Therefore the light/ball can also be caught in one of fhe balconies in which case the game restarts.

The lights/balls current coordinate is always sent to the second pc where it is used to calculate the correct shadows cast by the point-lightsource represented by the ball. Shadows are calculated via custom vertex- and pixelshaders.

  • the place, korai, the bank building by day
  • photos of setup

Early Screenshots

the tracker system

the shadowing system

anonymous user login

Shoutbox

~2d ago

CeeYaa: 16. vvvv Worldwide meetup RECORDING moved to: https://youtu.be/ecnUCMwEgJo

~2d ago

elektromeier: the meetup stream from yesterday seems to be a private video...

~3d ago

joreg: @barbarerik it is a VL example which you could adapt to gamma

~4d ago

barbarerik: @joreg I meant in Gamma

~8d ago

joreg: @barbarerik maybe this one helps: vvvv-beta\girlpower\VL\Curves\SplineTree

~8d ago

barbarerik: Can somebody point me to example how to Bezier in Gamma? some example of how to connect nodes. Thanks

~9d ago

karistouf: @joreg, thank you

~9d ago

joreg: @karistouf there are no freeframes in x64 but you can use Contours via VL.OpenCV in VL!

~9d ago

karistouf: is there any contour.dll (FreeFrame) in x64 ? thank you

~11d ago

joreg: @qoupas i'm afraid this is a rather unspecific question. please start a forum thread with more details so we can help you.