getBindGroupsCache() {

		let bindGroupsCache = rendererCache.get( this.renderer );

		if ( bindGroupsCache === undefined ) {

			bindGroupsCache = new ChainMap();

			rendererCache.set( this.renderer, bindGroupsCache );

		}

		return bindGroupsCache;

	}
Returns the bind groups of the current renderer.

@return {ChainMap} The cache.