How to obtain the actual position of model nodes

Questions
5

Since your model is offset far from its origin, you may want to get not the position but the center of the model.

// Get the center of the node, 
// all mesh and nodes under the node will be calculated.
let { max, min } = node.getHierarchyBoundingVectors()
let center = max.add(min).scale(0.5)

// Or 
// Get the center of the mesh, valid only for the current mesh.
let center =  mesh.getBoundingInfo().boundingBox.centerWorld
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