geometry, a C code which performs certain geometric calculations in 2, 3 and N space.
These calculations include angles, areas, containment, distances, intersections, lengths, and volumes.
Some geometric objects can be described in a variety of ways. For instance, a line has implicit, explicit and parametric representations. The names of routines often will specify the representation used, and there are routines to convert from one representation to another.
Another useful task is the delineation of a standard geometric object. For instance, there is a routine that will return the location of the vertices of an octahedron, and others to produce a series of "equally spaced" points on a circle, ellipse, sphere, or within the interior of a triangle.
The information on this web page is distributed under the MIT license.
geometry is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
ellipse, a C code which performs geometric calculations related to ellipses and ellipsoids.
geometry, a C code which performs geometric calculations in 2, 3 and M dimensional space, including the computation of angles, areas, containment, distances, intersections, lengths, and volumes.
sphere_quad, a C code which approximates an integral over the surface of the unit sphere by applying a triangulation to the surface;
tetrahedron, a C code which computes properties including the centroid, circumsphere, dihedral angles, edge lengths, face angles, face areas, insphere, quality, solid angles, and volume of a tetrahedron in 3D.
triangle, a C code which computes properties, including angles, area, centroid, circumcircle, edge lengths, incircle, orientation, orthocenter, and quality, of a triangle in 2D.
triangulate, a C code which triangulates a (possibly nonconvex) polygon.