This classes are on one hand intended to be used in the pandaroot framework to
propagate photons and on the other hand to make fast tests without the framework.

The classes depend only on the root classes which are installed on almost all
platforms.

The classes are documented with doxygen. Run it to find documentation of the interfaces
in doc/html/index.html

Some test_* programs show the usage.

test_simple_bar implements a single bar with a mirror on one side and a simplified
                photon detection on the other side.   

To compile evrything without the help of the framework do 

make -f Makefile_standalone

within the installed framework a simple

make
make install 

is sufficient. However the test_xxx programs are not generated.



A talk about these classes can be found at

http://www.gsi.de/documents/DOC-2007-Mar-122-1.ppt