XR camera subsystem

The camera subsystem manages a hardware camera on the AR device. It provides the following data:

• Camera image (as an "external" texture on the GPU).
• Camera image (as a buffer of bytes available on the CPU).
• Projection matrix, used to set the field of view and other properties of the virtual camera according to the physical one.
• Display matrix, used to orient the camera image correctly.
• Camera intrinsics that describe a mathematical model of the camera, useful for computer vision algorithms.
• Camera conversion utilities for converting the CPU image to RGB and grayscale.
• Light estimation information (color and brightness of the environment).
• Camera focus mode (autofocus or fixed).

For API details, see the XRCameraSubsystem.