Retrieve the location within the parent mesh

In my scenario, I have a series of meshes organized in a hierarchy as follows:

Scene
     -scene.add(SpaceMesh)
          -SpaceMesh.add(ShipMesh)

SpaceMesh is currently in motion within the scene. However, ShipMesh remains stationary.

When I request the x-coordinate of ShipMesh with ShipMesh.position.x, it understandably returns 0.

How can I obtain the coordinates of ShipMesh in relation to SpaceMesh?

--

For instance:

SpaceMesh.position.x = 100

ShipMesh.position.x = 0

The expected result would be ShipMesh.PositionInSpaceMesh.x = -100

javascriptvectorthree.jslinear-algebra

Answer №1

I'm not sure if this is the most efficient way, but I found a helpful resource on how to: get the global/world position of a child object

spaceMesh.updateMatrixWorld();
var vector = new THREE.Vector3();
vector.setFromMatrixPosition( spaceMesh.matrixWorld );
vector.multiplyScalar( -1 );
console.log(vector); // my coordinates in SpaceMesh

If there is a better solution or any best practices, please feel free to correct me. Thank you.

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