PolyMender is based on the algorithm presented in my paper Robust Repair of Polygonal Models appeared in the Proceedings of SIGGRAPH 2004. The program reads in a polygonal model (i.e., a bag of polygons, such as figure 1 left) and produces a closed surface (such as figure 1 right) that approximates the original model. PolyMender consumes a small amount of time and memory space, and can accurately reproduce the sharp features in the original geometry. PolyMender is suitable for repairing CAD models and gigantic polygonal models. Alternatively, PolyMender can also be used to generate a signed volume from any polygonal models.

ReMESH is a powerful editor for manifold triangle meshes with advanced repairing features.

Spiro simplifies the drawing of beautiful curves. Using bézier splines an artist can easily draw curves with the same slope on either side of an on-curve point. Spiros, on the other hand, are based on clothoid splines which make it easy to maintain constant curvature as well as constant slope. Such curves will simply look nicer. Raph Levien's spiro splines only use on-curve points and so are easier to use and more intuitive to the artist. This library will take an array of spiro control points and convert them into a series of bézier splines which can then be used in the myriad of ways the world has come to use béziers.

This document describes a C library implementation of a new polygon clipping algorithm. The techniques used are descended from Vatti's polygon clipping method. Subject and clip polygons may be convex or concave, self-intersecting, contain holes, or be comprised of several disjoint contours. It extends the Vatti algorithm to allow horizontal edges in the source polygons, and to handle coincident edges in a robust manner. Four types of clipping operation are supported: intersection, exclusive-or, union or difference of subject and clip polygons. The output may take the form of polygon outlines or tristrips.

Carve is a C++ library designed to perform boolean operations between two arbitrary polygonal meshes. The standard union and intersection operations are supported, as are symmetric and asymmetric difference. It is also possible to implement custom operations using Carve, allowing results to be formed from any combination of inputs.

Geomerative is a library for Processing, that consists of a series of classes enabling extended 2D geometry operations. It also enables the user to hold in objects information about 2D geometry elements, like shapes, polygons and meshes.

plunger is a 3D mesh format converter making extensive use of plugins to support different formats.