• Ongoing work to support polarization:
  • Support parallel transport of local tetrad
    • in many methods, double* coord_ph becomes state_t &coord_ph
    • Worldline: new APIs parallelTransport(), eAllocate(),
      eDeallocate(), eExpand()
    • Scenery: new API parallelTransport()
    • Screen: new API getRayTriad()
  • Introduce polarized quantities (Inu and alphanu for each
    component of the Stokes vector)
    • Several methods take additional arguments
    • Photon: new method transfer()
    • Scenery: new API getSpectralQuantitiesCount()
• Support computing Screen tetrad from arbitrary velocity
  • Metric:
    • new API zamoVelocity(), default assumes null 3-velocity.
    • new API observerTetrad(in pos, in fourvel, out screen1,2,3),
      default throws an Error.
    • new methods to help vector computations: dualOneForm(),
      normalizeFourVel(), norm(), multiplyFourVect(),
      addFourVect(), projectFourVect(), GramSchmidt()
  • KerrBL:
    • implement zamoVelocity();
    • remove observerTetrad(obskind...);
    • implement observerTetrad(pos, fourvel, ...) for any fourvel.
  • Screen: supports two new obskinds: VelocitySpecified and
    FullySpecified. obskind is now stored as and int and needs to
    be specified as e.g. ZAMO in XML.
• Astrobj:
  • Generic: new property DeltaMaxInsideRMax
  • New kinds FlaredDiskSynchrotron, ThickDisk
  • Jet:
    • support thermal distribution
    • new property JetVphiOverVr
  • ThinDisk: new property VelocityKind
  • Torus: add a Thermal Synchrotron spectrum
  • UniformSphere: deprecate property Alpha
• Screen:
  • support changing camera orientation (with dangle1 and dangle2)
  • change type of observerkind_ to obskind_t
• Python: new module gyoto.animate to help writing Gyoto-based movies.
• Command line: new task mk_video to help writing Gyoto-based movies.
• Register: loadPlugin() now returns a handle o the dlopen'ed plug-in.
• Star/StarTrace: allow expressing dates in proper or coordinate time.

Full Changelog: 1.3.6...1.4.0