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    VR-object turntable

      

    Used together with my Coolpix 990 remote control, this turntable forms an automatic studio for simple VR-object movies. It rotates the object on 360° and shoots photographs with equally spaced angles. You can then animate these images with a VR-object viewer such as PTviewer, Freedom-VR or Objplay. Remote and turntable can both be built with Lego Mindstorms Robotics Invention System (only parts included in this box are needed).

    You can see some samples in my VR-object page.

    Photography tip

    To have even exposure between images, don't forget to use Automatic Exposure lock. The other method (that I applied) is to use full manual mode. Similarly, I used fixed distance focussing.

    Program

    The program is written with , it must be compiled and downloaded in RCX before using it. I use RCX command center shell to edit the source files (RCXcc is now BricxCC, get it here).

    It is almost identical to Panobot2 program, except that the number of step per turn is 160 here, the encoder cylinder has two black and two white zones instead of one.

      • Three parameters can be modified in the source file to match your needs:

          #define NumberOfPhotos 20

           Number of photographs per turn

          #define PhotoSavingTime

           Interval between shots (in hundredth of second)

          #define InitialWait 100

           Delay before first trigger (in hundredth of second)


    Construction

    The rotating disk placed on Lego wheel is made with sandwitched cardboard/foam/cardboard (see photos below). Make it large enough so that disk edge is out of depth of field.

    Photo gallery

     

    July 2004 update:

    Bo Lorentzen, inspired by this page, built a motorized lazy Susan: a wheel, pressed against the edge, drives the turntable. A black and white strip is read by a light sensor to measure rotation angle.

    See below the photographs he sent me:

     


     

LEGO® MINDSTORMS® and Technic®MINDSTORMS® EV3/NXTMINDSTORMS SensorsLEGO® technical dataLDrawMiscellaneous LEGO®LEGO® & PhotographyPanoramic PhotographyPhoto GalleryHome