Please see my comments at the bottom (lol) about implementing a commercial GPU renderer from scratch with OpenCL (i.e. Nvidia, AMD and Intel, on Win Mac and Lin

Please see my comments at the bottom (lol) about implementing a commercial GPU renderer from scratch with OpenCL (i.e. Nvidia, AMD and Intel, on Win Mac and Linux). It's definitely possible to do it yourself in many cases, and while Nvidia have their amazing RTX technology now, for the sake of not having a GPU computing monopoly it's important to push for open standards support. There is DXR supporting multiple vendors, which is sort of one step forwards and two steps back (Windows-only)...