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I've written Java code to solve a simple electrical circuit and then I use the Processing libraries to draw and animate a 3D model of the circuit using P3D. But I find that the 3D perspective is unpredictable. Below are two screen shots of the output for a typical circuit. Sometimes it renders the way I intended (the first picture), and sometimes it renders like the second picture. I have found no pattern.
Does anyone recognize this problem? Is there some initialization step that I'm missing?