OpenScad Surface Solids 1.2

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Having been pondering how to model a playground or water slide tube, the user discovered an addition to OpenScad's Surface Solids library - Hermite curve/surface support. This feature utilizes the basic Hermite interpolation calculation and has introduced lerp (linear interpolation), berp (Bezier interpolation), and herp (Hermite interpolation) in the library. A Hermite curve is defined by two endpoints and their tangent vectors, similar to a Bezier curve. The user implemented a 'sweep_hermite()' module for the renderer, making it easy to create a solid by defining a profile curve and a sweep path. Thickness can be given for extrusion in a particular direction. This mechanism supports generalized sweeps with curves and is planned to be further developed with matrix representation of curves. Visual debugging support is also added, providing a rendering of the profile and sweep curves along with their tangent vectors. The user suggests using this tool while learning about different types of curves and surfaces, as it generates a physical object after all playing around. The license is public domain as this is well-trodden ground. Splines might be added in the future. To use, download the .scad files, play with test_hermite.scad to create pretty pictures, compile and export to .stl, and rejoice! This feature mainly generates singular pieces that are combined with other parts, like water slide shoots.