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ArcBall functionality for processing (ruby versions) as gem
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### Example Usage
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The sketch class need to to inherit from PApplet to work and self should return such an instance. The following is a ruby-processing example, which currently supplies arcball via a library, but gem distribution has its attractions
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The sketch class need to to inherit from PApplet to work and self should return such an instance. The following is a ruby-processing example, which currently supplies arcball via a library, but gem distribution has its attractions. Drag mouse to rotate. Hold down 'x', 'y' or 'z' keys to constrain axis of rotation, mouse-wheel to zoom.
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