OpenScad Revolids version 0.5

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Cubic curves create fascinating shapes using just four points, and can be used for intriguing surface revolution designs. OpenScad poses a challenge in handling these curves, but it's up to the task with the right approach. The revolids.scad file provides routines that enable users to generate bell-shaped images based on Catmull-Rom cubic curves and standard Bezier curves using the same control points. Additionally, other 'cubic' curve types can be utilized. Although these routines currently display pretty pictures, they do not yet perform surface normal calculations or solid creation. Further iterations are expected to address this. OpenScad compensates for its lack of function pointers by utilizing matrices, which are central to these designs. Users can play with the test_revolids.scad file and enjoy the results. An update has been released, showcasing a Hermite revolid with debugging normals, highlighting the need for improvement in circular normal calculations.