IMMERSAL - Visual Positioning System - for Augmented Reality

Immersal's Visual Positioning System (VPS) offers centimeter-accuracy in determining position and orientation of a handheld or head-worn device.
The tool allows developers to create Augmented Reality applications in the construction, retail, architecture, gaming industries and many more.

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Hi. I've been developing app using Immersal SDK and this experience is amazing. We could make a large scale AR. However, the accuracy and the stability of it is the main concern. Can anyone suggest how to get 100% accurate because the requirement for our project is to overlay the real world with 3D elements. For example, if there is a physical wall in front, we have to overlay it with the 3D version of the wall precisely and accurately. Please, I need help. Thank you.