code: int hash(ByteBuffer indices, ByteBuffer vertices, ByteBuffer normals, ByteBuffer colors) {
  		int hashCode = 0;
  		hashCode += indices.hashCode();
  		hashCode += vertices.hashCode();
  		hashCode += normals.hashCode();
  		hashCode += colors.hashCode();
  		
  		return hashCode;
  	}
docs: TODO add color??