update() {

		let updated = false;

		for ( const uniform of this.uniforms ) {

			if ( this.updateByType( uniform ) === true ) {

				updated = true;

			}

		}

		return updated;

	}
Updates this group by updating each uniform object of
the internal uniform list. The uniform objects check if their
values has actually changed so this method only returns
`true` if there is a real value change.

@return {boolean} Whether the uniforms have been updated and
must be uploaded to the GPU.