web api instance property
XRCPUDepthInformation: data property
Limited availability
The read-only data property of the XRCPUDepthInformation interface is an ArrayBuffer containing depth-buffer information in raw format.
The data is stored in row-major format, without padding, with each entry corresponding to distance from the view’s near plane to the users’ environment, in unspecified units. The size of each data entry and the type is determined by depthDataFormat. The values can be converted from unspecified units to meters by multiplying them by rawValueToMeters. The normDepthBufferFromNormView property can be used to transform from normalized view coordinates (an origin in the top left corner of the view, with X axis growing to the right, and Y axis growing downward) into the depth buffer’s coordinate system.
Value
An ArrayBuffer.
Examples
Use getDepthInformation() to obtain depth information. The returned XRCPUDepthInformation object will contain the data buffer.
For CPU depth information and a buffer that has “luminance-alpha” format:
const uint16 = new Uint16Array(depthInfo.data);
const index = column + row * depthInfo.width;
const depthInMeters = uint16[index] * depthInfo.rawValueToMeters;
(Use Float32Array for a “float32” data format.)
Note that the depth in meters is in depth-buffer coordinates. Additional steps are needed to convert them to normalized view coordinates, or the getDepthInMeters() method can be used.