Firstly, I am worried that OpenGL development seems to be stalled and it looks like its going into maintenance mode, where Vulkan is where all action happens. I

Firstly, I am worried that OpenGL development seems to be stalled and it looks like its going into maintenance mode, where Vulkan is where all action happens. It is increasingly pushed as a replacement to OpenGL, implicitly or explicitly, and if it will be the only mainstream alternative, I am somewhat worried. Secondly, I am worried that there are no mid-level 3D graphic toolkits. We have low-level (very very low-level) like Vulkan, or high-level stuff like Three.js and game engines (which are not what I need, as I write realtime scientific visualization code). What I want is something like imgui (https://github.com/ocornut/imgui https://github.com/ocornut/imgui), but for 3D. Simple, powerful, and bloat-free. However, I can't find anything like this.