import { Box3 , BufferAttribute , BufferGeometry , Euler , Float32BufferAttribute , LineBasicMaterial , LineSegments , Vector3 } from 'three' ; /**
 * Box3Helper, but modified to be movable, rotatable and scalable using TransformControls to modify multiple selected objects at once
 */ export class SelectionBoxHelper extends LineSegments { private box : Box3 ; public prevPosition : Vector3 ; public prevRotation : Euler ; public prevScale : Vector3 ; constructor ( box , color = 0xffff00 ) { const indices = new Uint16Array ( [ 0 , 1 , 1 , 2 , 2 , 3 , 3 , 0 , 4 , 5 , 5 , 6 , 6 , 7 , 7 , 4 , 0 , 4 , 1 , 5 , 2 , 6 , 3 , 7 ] ) ; const positions = [ 1 , 1 , 1 , - 1 , 1 , 1 , - 1 , - 1 , 1 , 1 , - 1 , 1 , 1 , 1 , - 1 , - 1 , 1 , - 1 , - 1 , - 1 , - 1 , 1 , - 1 , - 1 ] ; const geometry = new BufferGeometry ( ) ; geometry . setIndex ( new BufferAttribute ( indices , 1 ) ) ; geometry . setAttribute ( 'position' , new Float32BufferAttribute ( positions , 3 ) ) ; super ( geometry , new LineBasicMaterial ( { color : color , toneMapped : false } ) ) ; this . box = box ; this . geometry . computeBoundingSphere ( ) ; this . prevPosition = new Vector3 ( ) ; this . prevRotation = new Euler ( ) ; this . prevScale = new Vector3 ( ) ; } updatePositionRotationScale ( ) { console . log ( 'UPDATE POS' ) ; const box = this . box ; if ( box . isEmpty ( ) ) return ; box . getCenter ( this . position ) ; this . rotation . set ( 0 , 0 , 0 ) ; box . getSize ( this . scale ) ; this . scale . multiplyScalar ( 0.5 ) ; this . prevPosition . copy ( this . position ) ; this . prevRotation . copy ( this . rotation ) ; this . prevScale . copy ( this . scale ) ; } updateMatrixWorld ( force ) { const box = this . box ; if ( box . isEmpty ( ) ) return ; super . updateMatrixWorld ( force ) ; } }