about D435i device data acquisition
Hello, if you would prefer a mostly pre-made solution then the D435i-compatible Nuitrack SDK commercial software package may suit your needs. It provides Unity integration and can detect the coordinates of body joints and calculate the distance between two joints.
The link below has a Nuitrack tutorial project for Unity.
The section of the guide linked to below provides code for defining connections that have initial and end points and then finding the distance between those initial and end joints.
Alternatively, if you would like to create your own joint tracking / measuring solution, a research paper from 2020 in the link below that used Unity may provide useful insights.
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