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3

I’ll just leave the sub-class here.

export class BoneIKController extends BABYLON.BoneIKController {
    /**
     * A switch indicating that the rotation from the target mesh also be used to rotate
     * any child bones of the IK bone.
     */
    private _childRotationBone : Bone;

    constructor(mesh: BABYLON.TransformNode,
        bone: Bone,
        options?: {
            targetMesh?: BABYLON.TransformNode, // this does not have to be a mesh; named like for back compatability
            poleTargetMesh?: BABYLON.TransformNode,
            poleTargetBone?: Bone,
            poleTargetLocalOffset?: BABYLON.Vector3,
            poleAngle?: number,
            bendAxis?: BABYLON.Vector3,
            maxAngle?: number,
            slerpAmount?: number,
            childRotationBone?: Bone // additional option added
        }) {
        super(mesh, bone, options);
         if (options && options.childRotationBone) {
             this._childRotationBone = options.childRotationBone
         }
    }

    public update() : void {
        super.update();
        if (this._childRotationBone) this._childRotationBone.setRotation(this.targetMesh.rotation);
    }
}

It is very simple:

  • Add an option childRotationBone
  • Add a line in constructor to assign a private property if the option was used
  • Execute a line in update if the private property was found.