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POGenerating 3D models via primitive skinning
 

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    <p>I am looking for a method by which to generate 3D models for use in video games. The idea is virtual primitives that are simply points with associated data for size, shape, material and rotation. </p> <p>For instance an asteroid might start as two simple spheres that intersect. Material of dusty rock which would tell the skinning algorithm to provide smooth sandy curves and occasional jagged boulders. Probably end up with a sort of lumpy peanut shape.</p> <p>After that add smaller spheres with material of void or crater, peppered around the object. These would produce crater like areas in the surface of the peanut and the skin would adjust to suit. In the end you would have a semi plausible representation of an asteroid.</p> <p>Now with that in mind, my question is, are there any decent open source or public domain examples of skinning algorithms that can find the surface of a model and generate a smooth, evenly distributed quad-strip mesh that could be then textured? </p> <p>Some more information; I'm looking at CSG methods for the underlying models (adding and subtracting volume) then looking at other methods for remeshing the whole thing.</p>
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    1. COHave you looked at [CGAL](http://www.cgal.org/). They have multiple open source geometry algorithms for [mesh generation](http://www.cgal.org/Manual/latest/doc_html/cgal_manual/contents.html#part_XI), [processing](http://www.cgal.org/Manual/latest/doc_html/cgal_manual/contents.html#part_XII) and [polyhedra](http://www.cgal.org/Manual/latest/doc_html/cgal_manual/contents.html#part_VII). The [NEF Polyhedra section](http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Nef_3/Chapter_main.html) looks particularly close to what you were talking about.
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    2. COIt is interesting, I'll have to do more research on it. Right now looking through Sparse Voxel Octrees.
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    3. COIf you want to have scripts that generate 3D models using CSG techniques, there is no better software than [OpenSCAD](http://www.openscad.org/). It uses the aforementioned CGAL on the back end, but provides a script-based interface for parametric model generation. I've been using it for years for 3D printing, and love it. It also has a command line interface so you can script it from a unix shell or command.exe. It will not, however, be able to integrate into your game in realtime. It will require you to create your models ahead of time, which I'm not sure is what you're looking for.
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