3D for Beginners
Processing provides not only tools for creativity in 2D but also in 3D - a room instead of a canvas. You can also place a camera.
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For Data Visualization 3D can be a useful Tool. In maths you encounter 3D Formula you can explore more easily in 3D.
First items like boxes and spheres in 3D and Camera Movement.
Like in 1st Person Shooters or 3rd Person Games such as Tomb Raider, the Camera follows the Figure running around. You can move with the keys WASD. You can look around with the Mouse.
This is really to demonstrate the camera management (you run around (moves the camera) and look around (rotates the camera)).
Other Games which are 3D or have a 3D Look.