public MeshPartBuilder part (final String id, int primitiveType, final long attributes, final Material material) {
		return part(id, primitiveType, MeshBuilder.createAttributes(attributes), material);
	}

public MeshPartBuilder part (final String id, int primitiveType, final VertexAttributes attributes, final Material material) {
		final MeshBuilder builder = getBuilder(attributes);
		part(builder.part(id, primitiveType), material);
		return builder;
	}

private MeshBuilder getBuilder (final VertexAttributes attributes) {
		for (final MeshBuilder mb : builders)
			if (mb.getAttributes().equals(attributes) && mb.lastIndex() < Short.MAX_VALUE / 2) return mb;
		final MeshBuilder result = new MeshBuilder();
		result.begin(attributes);
		builders.add(result);
		return result;
	}

public void part (final MeshPart meshpart, final Material material) {
		if (node == null) node();
		node.parts.add(new NodePart(meshpart, material));
	}

public MeshPart part (final String id, final int primitiveType, MeshPart meshPart) {
		if (this.attributes == null) throw new RuntimeException("Call begin() first");
		endpart();

		part = meshPart;
		part.id = id;
		this.primitiveType = part.primitiveType = primitiveType;
		parts.add(part);

		setColor(null);
		setVertexTransform(null);
		setUVRange(null);

		return part;
	}