THREE.jsにてモデル座標と、世界座標を扱いたいので調べると

three.js - documentation

Object3D

Base class for scene graph objects.

Constructor

Object3D()

The constructor takes no arguments.

Properties

.parent

Object's parent in the scene graph.

.children

Array with object's children.

.rotation

Object's local rotation (Euler angles), in radians.

.matrix

Local transform.

.matrixWorld

The global transform of the object. If the Object3d has no parent, then it's identical to the local transform.

.matrixAutoUpdate

When this is set, it calculates the matrix of position, (rotation or quaternion) and scale every frame and also recalculates the matrixWorld property.

.matrixWorldNeedsUpdate

When this is set, it calculates the matrixWorld in that frame and resets this property to false.
.rotationAutoUpdate

When this is set, then the rotationMatrix gets calculated every frame.

Methods

.localToWorld( vector )

vector - A local vector.
Updates the vector from local space to world space.

.worldToLocal( vector )

vector - A world vector.
Updates the vector from world space to local space.

.add( object )

object - An object.
Adds object as child of this object.

.remove( object )

object - An object.
Removes object as child of this object.

.updateMatrix()

Updates local transform.

.updateMatrixWorld( force )

Updates global transform of the object and its children.

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