General relativistic ray-tracing

 Gyoto is a framework for computing geodesics in curved
 space-times. The gyoto utility program uses this framework to compute
 images of astronomical objects in the vicinity of compact objects
 (e.g. black-holes). Such images are distorted by strong gravitational
 lensing. The gyoto program takes a scenery description in XML format,
 computes this scenery using relativistic ray-tracing, and saves the
 result in FITS format.
 .
 More complex uses of the Gyoto framework can be achieved using the
 yorick-gyoto, python-gyoto or python3-gyoto packages. Gyoto can be
 extended with plug-ins (see libgyoto4-dev).
 .
 MPI parallelization requires the mpi-default-bin package.