3D Algorithm Animator (3DAA) is a Java applet for visualizing algorithms. The current version simulates a raytracer. Included features are: The user can render an image of a scene. The user can create, modify, or select a scene. The path of a ray can be recorded. Additional 3D algorithms can be integrated.
Here’s a screen shot: 
Quick start:
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Download these two files: github.com/bmaltzan/3daa/tree/master/sim11
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Install the java plugin for your browser
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Drag the index.html file into your browser