VRPose

Experimental

Это экспериментальная технология
Так как спецификация этой технологии ещё не стабилизировалась, смотрите таблицу совместимости по поводу использования в различных браузерах. Также заметьте, что синтаксис и поведение экспериментальной технологии может измениться в будущих версиях браузеров, вслед за изменениями спецификации.

The VRPose interface of the WebVR API represents the state of a VR sensor at a given timestamp (which includes orientation, position, velocity, and acceleration information.)

This interface is accessible through the VRDisplay.getPose() (en-US) and VRDisplay.getFrameData() (en-US) methods. VRDisplay.getPose() (en-US) is deprecated.

Properties

VRPose.position Только для чтения
Returns the position of the VRDisplay at the current VRPose.timestamp (en-US) as a 3D vector
VRPose.linearVelocity (en-US) Только для чтения
Returns the linear velocity of the VRDisplay at the current VRPose.timestamp (en-US), in meters per second.
VRPose.linearAcceleration (en-US) Только для чтения
Returns the linear acceleration of the VRDisplay at the current VRPose.timestamp (en-US), in meters per second per second.
VRPose.orientation (en-US) Только для чтения
Returns the orientation of the sensor at the current VRPose.timestamp (en-US), as a quarternion value.
VRPose.angularVelocity (en-US) Только для чтения
Returns the angular velocity of the VRDisplay at the current VRPose.timestamp (en-US), in radians per second.
VRPose.angularAcceleration (en-US) Только для чтения
Returns the angular acceleration of the VRDisplay at the current VRPose.timestamp (en-US), in meters per second per second.

Obsolete properties

VRPose.timeStamp (en-US) Только для чтения Этот API вышел из употребления и его работа больше не гарантируется.
Returns the current time stamp of the system — a monotonically increasing value useful for determining if position data has been updated, and what order updates have occured in. This version of timestamp has been removed from the spec — instead, timestamps are now returned when VRDisplay.getFrameData() (en-US) is called — see VRFrameData.timestamp (en-US).

Examples

var frameData = new VRFrameData();
var vrDisplay;

navigator.getVRDisplays().then(function(displays) {
  vrDisplay = displays[0];
  console.log('Display found');
  // Starting the presentation when the button is clicked: It can only be called in response to a user gesture
  btn.addEventListener('click', function() {
    vrDisplay.requestPresent([{ source: canvas }]).then(function() {
      drawVRScene();
    });
  });
});

// WebVR: Draw the scene for the WebVR display.
function drawVRScene() {
  // WebVR: Request the next frame of the animation
  vrSceneFrame = vrDisplay.requestAnimationFrame(drawVRScene);

  // Populate frameData with the data of the next frame to display
  vrDisplay.getFrameData(frameData);

  // You can get the position, orientation, etc. of the display from the current frame's pose
  // curFramePose is a VRPose object
  var curFramePose = frameData.pose;
  var curPos = curFramePose.position;
  var curOrient = curFramePose.orientation;

  // Clear the canvas before we start drawing on it.

  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);

  // WebVR: Create the required projection and view matrix locations needed
  // for passing into the uniformMatrix4fv methods below

  var projectionMatrixLocation = gl.getUniformLocation(shaderProgram, "projMatrix");
  var viewMatrixLocation = gl.getUniformLocation(shaderProgram, "viewMatrix");

  // WebVR: Render the left eye’s view to the left half of the canvas
  gl.viewport(0, 0, canvas.width * 0.5, canvas.height);
  gl.uniformMatrix4fv(projectionMatrixLocation, false, frameData.leftProjectionMatrix);
  gl.uniformMatrix4fv(viewMatrixLocation, false, frameData.leftViewMatrix);
  drawGeometry();

  // WebVR: Render the right eye’s view to the right half of the canvas
  gl.viewport(canvas.width * 0.5, 0, canvas.width * 0.5, canvas.height);
  gl.uniformMatrix4fv(projectionMatrixLocation, false, frameData.rightProjectionMatrix);
  gl.uniformMatrix4fv(viewMatrixLocation, false, frameData.rightViewMatrix);
  drawGeometry();

  function drawGeometry() {
    // draw the view for each eye
  }

    ...

  // WebVR: Indicate that we are ready to present the rendered frame to the VR display
  vrDisplay.submitFrame();
}

Note: You can see this complete code at raw-webgl-example.

Specifications

Specification Status Comment
WebVR 1.1
Определение 'VRPose' в этой спецификации.
Черновик Initial definition

Browser compatibility

BCD tables only load in the browser

See also