Yup ortho might do if it is what you are looking for. You will need to change:
camera.orthoTop = 2;
camera.orthoBottom = -2;
camera.orthoLeft = -2;
camera.orthoRight = 2;
to fit with your scene: https://www.babylonjs-playground.com/#KUM5WC#25
You could also compute the exact radius needed to fit your object vertically like : javascript - Calculate camera zoom required for object to fit in screen height - Stack Overflow