The BIM Helmet is like any other tool that needs maintenance, care, and setup. Spectar runs at 60 frames per second; meaning all you have to do is maintain an environment where the HoloLens can track the surroundings, ensuring the hologram and the matching coordinate system are in sync.
The stability of BIM Overlay is the result of a well-mapped environment and good app performance. From a user’s perspective, holograms that are meant to be stationary won’t move relative to the environment.
Once the BIM Overlay is placed and world-locked in existing conditions, it should stay where it’s placed relative to the surrounding environment, and independent of user motion or small and sparse environment changes.
Spectar provides you with the ability to achieve the desired accuracy when using “Visor down” placement, As-built World Locking, and Large Model Dynamic Rendering.
Frame rate is the main pillar of hologram stability. For holograms to appear stable in the existing conditions, each image presented to the user must have the holograms drawn in the correct spot. The displays on HoloLens2 refresh 240 times a second, showing 4 separate color fields for each newly rendered image. The result is a user experience of 60 FPS (frames per second). To give the best experience possible, application developers must maintain 60 FPS, which translates to a consistent new image to the operating system every 16 milliseconds.
To draw holograms that look like they’re sitting on your deck, the HoloLens must render images from the user’s position. It predicts where a user’s head will be when the images are shown in the displays. The prediction algorithm is an approximation and adjusts the rendered image to account for the discrepancy between the predicted head position and the actual head position. This adjustment makes the holograms look stable from the user’s perspective.
The Spectar Engineering team is continuously reviewing opportunities to stay at or above 60 FPS. To see the current frame rate of your experience, say “toggle profiler” while using Spectar.
Geek out with Spectar Engineering about how they significantly reduced Drift, Jitter, Judder, Jumpiness, Swim, and Color separation.