What is Scene Understanding?
Scene Understanding is an advanced feature of Spatial Awareness that gives HoloLens 2 developers a structured, high-level environment representation.
Your mixed reality device is constantly integrating information about what it sees in your environment. Scene Understanding funnels all of these data sources and produces one single cohesive abstraction.
With Scene Understanding, you can rely on the system to tell you when it has detected certain surfaces and identify the surfaces as walls, floors, ceilings, and platforms. Scene Understanding creates a watertight mesh of your environment, even if you haven't scanned it completely.
Note that Scene Understanding SDK is only available for HoloLens 2.
The goal of Scene understanding is to transform the un-structured environment sensor data that your Mixed Reality device captures and to convert it into a powerful, but abstracted, representation that is intuitive and easy to develop for. The Scene Understanding SDK acts as the communication layer between your application and the Scene Understanding runtime. It's aimed to mimic existing standard constructs such as 3D scene graphs for 3D representations and 2D rectangles and panels for 2D applications. In general, Scene Understanding is framework agnostic, allowing for interop between varied frameworks that interact with it.
The process of converting the raw sensor data into a Scene is a potentially expensive operation that could take seconds for medium spaces (~10x10m) to minutes for very large spaces (~50x50m), and therefore it is not something that is being computed by the device without application request.
Many of the core scenarios for environmentally aware applications, for example placement of objects, creating occlusion for a virtual object and running physics simulations that takes into account of the virtual objects and your environment are addressable by both Spatial Mapping and Scene Understanding. There are few differences you need to consider before deciding which one to use for your application. A core difference between Scene understanding and Spatial mapping is a trade-off of maximal accuracy and latency to structure and simplicity. If your application requires the lowest-latency possible and mesh triangles that only you will want to access, use Spatial Mapping directly. If you are performing higher level processing, you may consider switching to the Scene understanding model as it should provide you with a super-set of spatial mapping functionality. Also note that because Scene understanding provides a snapshot of the spatial mapping mesh as part of its representation, you will always have access to the most complete and accurate spatial mapping data possible.
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