• Enable/Disable shapes you want to practice with the menu in the top left.
• Click the timer in the bottom right to stop it. Drag it to change the time you have for each reference.
• New shapes can be added by placing gltf or glb files into the assets/references folder.

windows 64 bit
Download the zip file from releases, unpack it and run shapes.exe.

any other platform
You will have to build the project yourself with cargo, rust's build system and package manager.

• Install cargo following instructions from https://www.rust-lang.org/tools/install.
• Clone this repository or download it as a zip file by clicking the big green "Code" button.
• Run cargo run on any command line inside of the folder containing this project.