constructor( mesh, grants = [] ) {

			this.mesh = mesh;
			this.grants = grants;

		}
Solver for Grant (Fuyo in Japanese. I just google translated because
Fuyo may be MMD specific term and may not be common word in 3D CG terms.)
Grant propagates a bone's transform to other bones transforms even if
they are not children.
@param {THREE.SkinnedMesh} mesh
@param {Array<Object>} grants