Pimath binds the Imath API as closely as possible. Each hpp file contains a comment block at the top, highlighting cases where the bindings differ and why. Common reasons include:

Making a function signature more Pythonic;
Removing slightly optimised functions (where the overhead of python itself would vastly outweigh the optimisation);
Removing API redundancy;
Changing misleading Imath function names (rare).
Nice things about pimath:

It provides integral template instantiations where possible – eg V3i;
It provides ‘half’ template instantiations where possible – eg M33h;
It provides to- and from-python conversion for the Imath ‘half’ type;
It spreads type instantiation over several cpp files for quick multithreaded compiling.
It’s organised as a mirror image of Imath – it has corresponding headers, and a free function in Imath is a free function in pimath. If you know Imath, you know pimath.

Project Page: http://code.google.com/p/pimath/
Language: C++, python
Platform: All
License: New BSD Licence
Sponsor: Dr. D. Studios

History

At Disney there have been various expression languages. SeExpr started as a language for our procedural geometry instancing tool, XGen. Work was done to generalize it into something that could be used in other contexts. Later it was integrated into paint3d, our texture painting facility, which opened the door to procedural synthesis. More recently, we have integrated it as a way of defining procedural controls to physical dynamical simulations and render time particle instancing.

Expressions can be seen as a way of allowing customization of inner loops. This is contrast to scripting which is mostly aimed at gluing large parts of code base together. So in this sense, C++ forms the center of your application, python could be used to put pieces of it together, and SeExpr is used to customize tight inner loops.

Major Features

• Arithmetic expression of scalar/vector types
• Large library of builtin functions
• Extensible variables and functions (including with DSOs)
• Simple to embed in any program

Home Page: http://www.disneyanimation.com/technology/seexpr.html
Project Page: http://github.com/wdas/seexpr/
Language: C++
Platform: Linux, OSX, Windows
License: New BSD
Sponsor: Walt Disney Animation Studios

It contains several C++ classes from simple string operations down to complex geometric operations. Essence can give you a boost when developing, by providing all of the basic framework you need.

Home Page: http://opensource.studionestbarcelona.com/studio_NEST/essence.html
Project Page: http://github.com/studioNEST/Essence
Language: C++
Platform: Windows, Linux
License: LGPL v3
Sponsor: StudioNest

The code is written entirely in C with an object-oriented approach based mostly on the design of GTK+. Careful attention is paid to performance related issues as the initial goal of GTS is to provide a simple and efficient library to scientists dealing with 3D computational surface meshes.

A brief summary of its main features:

• Simple object-oriented structure giving easy access to topological properties.
• 2D dynamic Delaunay and constrained Delaunay triangulations.
• Robust geometric predicates (orientation, in circle) using fast adaptive floating point arithmetic (adapted from the fine work of Jonathan R. Shewchuk).
• Robust set operations on surfaces (union, intersection, difference).
• Surface refinement and coarsening (multiresolution models).
• Dynamic view-independent continuous level-of-detail.
• Preliminary support for view-dependent level-of-detail.
• Bounding-boxes trees and Kd-trees for efficient point location and collision/intersection detection.
• Graph operations: traversal, graph partitioning.
• Metric operations (area, volume, curvature …).
• Triangle strips generation for fast rendering.

Home Page: http://gts.sourceforge.net/
Project Page: http://sourceforge.net/projects/gts/
Language: C
Platform: Linux, Windows, OS X
License: LGPL

Home Page: http://www.cgal.org/
Project Page: http://www.cgal.org/
Language: C++
Platform: Linux, Mac OS X, Windows
License: LGPL or QPL (if used for open source projects, or proprietary projects that are internal to the studio), or a commercial license (if distributed in a commercial product).