Hi @shresthaprasun,
Welcome to the community! I recommend checking out the following threads that are related to point clouds in CesiumJS:
- 3D tiles point cloud feature picking
- How to color the point cloud according to the dynamic point range
- Millimeter precision point clouds running in Cesium
- Limiting scene.pickPosition to return only positions on a point cloud?
Are you looking to access the raw vertices of the entire point cloud or only specific points?
-Sam