Data Visualization using Virtual Reality (extending DECK.GL)
By leveraging the power of deck.gl visualization tool, we want to view complex datasets in stereoscopic view in a virtual environment.
This example can be viewed in VR-capable devices. It uses deck.gl's multi-viewport, the WebVR API and WebVR Polyfill library.
The _initVRDisplay() method setups the VRDisplay and sets vrEnabled to true if a VR display is connected.
In the absence of an actual VR device, the default Orbit Controller along with the Orbit Viewport will be used. However, a stereoscopic view can still be activated.
For stereoscopic rendering and Side-by-Side display, two default viewports are used.
The WebVR API provides VRFrameData constructed by the VRDisplay.getFrameData function. This frame data is essential for obtaining the viewMatrix and projectionMatrix of both the left and right eye.
The base deck.gl viewport can directly accept these matrices using the DeckGL.viewports property.
The EmulatedVRDisplay comes into picture when an actual VR hardware is not present.
It provides a mock VRFrameData object which contains necessary matrices used for rendering the viewports.
The getFrameDataFromPose() method accepts an emulated VRPose object which contains the orientation and position.
Thus, allowing manual control over the pose and finally, interaction in the viewports.