In addition to using the built-in primitives and imported geometry, Nuke also allows you to create dense point clouds and geometry from scratch.
This section focuses on creating point clouds using the DepthToPosition, PositionToPoints, and DepthToPoints nodes available in Nuke. However, if you have a NukeX license, you can also use the CameraTracker and PointCloudGenerator nodes to create point clouds or the ModelBuilder node to build 3D models for 2D shots. See Creating Dense Point Clouds and Using ModelBuilder for more details.