Xojo3D not working

That page directs me to the Red Book page. However, that page has all the code expressed in C (or C++).
I know I can easily translate most of the code to Xojo, but most of the examples are generic.
For example, I do have all the necessary vertex, face, uv information available. But I can’t seem to be able to draw any polygons. It only shows me a black rectangle.
I was hopping to be able to see actual Xojo examples, that is why I was eager to see what was on the “deceased” Xojo3D.com site.