Examples of javax.media.j3d.Screen3D

• javax.media.j3d.Screen3D
  The Screen3D Object contains all information about a particular screen. All Canvas3D objects on the same physical screen (display device) refer to the same Screen3D object. Note that Screen3D has no public constructors--it is obtained from the Canvas3D via the getScreen3D method.

  Default values for Screen3D parameters are as follows:

  physical screen width : 0.0254/90.0 * screen width (in pixels)
  physical screen height : 0.0254/90.0 * screen height (in pixels)
  tracker base to image plate transform : identity
  head tracker to left image plate transform : identity
  head tracker to right image plate transform : identity
  off-screen size : (0,0)
  

  Offscreen Rendering

  New for Java 3D 1.2, an off-screen rendering mode allows rendering to a memory image, which is possibly larger than the screen. The setSize and getSize methods are defined specifically for this mode. Note that the off-screen size, physical width, and physical height must be set prior to rendering to the associated off-screen canvas. Failure to do so will result in an exception.

  Calibration Parameters

  The Screen3D object must be calibrated with the coexistence volume. The Screen3D class provides several methods for defining the calibration parameters.

  Measured Parameters

  The screen's (image plate's) physical width and height (in meters) is set once, typically by a browser, calibration program, system administrator, or system calibrator, not by an applet. These values must be determined by measuring the display's active image width and height. In the case of a head-mounted display, this should be the display's apparent width and height at the focal plane. These values are defined by the setPhysicalScreenWidth and setPhysicalScreenHeight methods.

  Head-tracker Coordinate System

  If head tracking is enabled, one of two parameters need to be specified:

  • If the view policy is SCREEN_VIEW, the tracker-base-to-image-plate coordinate system must be specified (setTrackerBaseToImagePlate method). This coordinate system must be recalibrated whenever the image plate moves relative to the tracker.
  • If the view policy is HMD_VIEW, the head-tracker-to-left-image-plate and head-tracker-to-right-image-plate coordinate systems must be specified (setHeadTrackerToLeftImagePlate and setHeadTrackerToRightImagePlate methods).

  Additional Information

  For more information, see the Introduction to the Java 3D API and View Model documents. @see Canvas3D @see Canvas3D#getScreen3D

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