One thing that AndrewT did not explain is what 'sync' is.
When you have a 3D model loaded up, the camera has to render the 3D scene so you can see it in real time. Using the command 'sync on' to turn synchronization on is the first step. Synchronization is the rendering process. It syncs the 3D scene from the camera's point of view to your monitor.
In your do-loop, it's nessecary to call 'sync' at the end, right before the 'loop' command to draw everything there is in your 3D scene to your monitor.
The 'text' command is an advanced version of the 'print' command. You can place the text anywhere on the screen.
There you have it.
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