> Previously you had to interact with it through proprietary Nvidia APIs
That was never the case, OptiX was never intended for use in games. VK_NV_ray_tracing and DXR 1.0 were pretty much there since launch for the former and quite soon afterwards for the other.
I was talking about VK_NV_ray_tracing precisely, which is proprietary Vulkan extension. And I thought there was a similar situation with DXR(at first proprietary Nvidia extension and then common standard), but I was mistaken.
> I was talking about VK_NV_ray_tracing precisely, which is proprietary Vulkan extension
Khronos does not promote an extension to KHR until multiple vendors ship support for it.
VK_KHR_ray_tracing is a direct continuation of VK_NV_ray_tracing with very light code changes needed. (and nothing prevents a vendor from shipping support for the two)
