1. mouse/key move/rotate object(vim for rotate, wasd for move), scroll to max/minize
2. basic key bindings, e.g. esc->quit
3. using texture with stb_image
4. use imgui for interaction
5. work with cmake
6. Updating into OpenGL3 with GLSL.
7. Allowing many interaction based on ImGui(for graphics study).

1. add light (commonly good for light) settings, summarize those rendering things into imgui.
2. Allow more man-graphics interaction (mouse rasting)
3. Integral algorithms like meshlab.
4. Add more things I know: multy threads, argparser, json file for rendering, ply loader()
5. CMake Tests and run time config(and loader)
6. More intuitive rotation.(4-dim numbers).
7. github workflows (and submodules for cross platform)
8. LICENSE(finally)

Mainly learnt from polyscope, libigl, [learnopengl], thanks to all of them! without who I will never be able to play on such an amazing graphics playground.