Date: August, 2005.
PIP computes the mass properties of an object given its density (assumed uniform). The input is a CART3D surface triangulation of the object. The code returns the object's mass, volume, surface area, center of mass, principal moments of inertia, principal axes of inertia, and the Euler parameters for the tranformation from inertial to principal axes coordinates. An automatic attempt is made to line up the principal axes as closely as possible to the inertial Cartesian axes.
An option is available to enter a general inertia tensor and compute the principal moments and axes of inertia, etc. Enter -1 for the filename to input the general inertia tensor. The output also contains an XML block in the GMP format for the principal axes orientation vector and angle as utilized by flow solvers that accept such format for mass properties input.