Attention macOS users! You MUST follow all instructions below to run this program. Read the instructions thoroughly.
Ran out of steam, so I'm leaving y'all with this final version to enjoy. Works, but isn't fancy.
WASD to move, IJKL to rotate the camera.
Running the binaries
macOS: The macOS release is for Apple Silicon (arm64). Download the file, then select a .obj file from the repo and download it to the same directory. In your terminal, run chmod +x ./3drender-macos (or wherever the binary is). Then, run it with ./3drender-macos. You will now get a system prompt warning you against running the program. I promise it's safe, I just didn't bother buying a developer license and signing the binary. Go to System Settings > Privacy and Security, scroll down, and select the option to run the program anyway. Hit open anyway and authenticate. It will open in a terminal and do nothing. Close the terminal it opens, then return to your original terminal and run un ./3drender-macos ./(model).obj where (model) is whatever model you downloaded. Sorry for the convoluted instructions, it's Apple.
Linux: The Linux release is for amd64. Download the file, then select a .obj file from the repo and download it to the same directory. In your terminal, run chmod +x ./3drender-linux. Then, run ./3drender-linux ./(model).obj where (model) is the model you chose (likely "3d" or "cube"). Enjoy!