Why all meshes has the same .matrixWorld values?

[OliverXH]

Getting world position of child

You can use Object3D.getWorldPosition() to get the position of obj3 in world space. obj3.getWorldPosition( someOtherObject.position ); Notice how the position vector of someOtherObject is applied as a parameter. This memory-friendly approach avoids the instantiation of a result object. The position data are directly written to the someOtherObject.position vector.