quad_stuff.java

public BakedQuad rotate(final Matrix4f transform, final Matrix3f invtranspose, BakedQuad quad)
    {
        UnpackedBakedQuad.Builder builder = new UnpackedBakedQuad.Builder(DefaultVertexFormats.ITEM);
        IVertexConsumer cons = new VertexTransformer(builder)
        {
            @Override public void put(int element, float... data)
            {
                VertexFormatElement el = DefaultVertexFormats.ITEM.getElement(element);
                switch(el.getUsage())
                {
                case POSITION:
                    float[] newData = new float[4];
                    Vector4f vec = new Vector4f(data);
                    transform.transform(vec);
                    vec.get(newData);
                    parent.put(element, newData2);
                    break;
                case NORMAL:
                    float[] newData2 = new float[4];
                    Vector3f vec2 = new Vector3f(data);
                    invtranspose.transform(vec2);
                    vec2.get(newData2);
                    newData[3] = 0;
                    parent.put(element, newData2);
                    break;
                default:
                    parent.put(element, data);
                    break;
                }
            }
        };
        quad.pipe(cons);
        return builder.build();
    }