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It would be nice if I could retrieve the values from memory after the the shader has calculated them but it doesn't seem possible - or advisable But, it IS possible, and I would advise it: https://www.opengl.org/wiki/Transform_Feedback


The basic cause of the problem was that my value for screenY (2D location of mouseclick on Y-axis) was incorrect and so passing it to any valid picking ray function returned invalid results. My old working project got the mouse position values from the org.lwjgl.input.Mouse class whereas the new project is using java.awt.event.MouseListener. The lwjgl ...

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