indeclared M_PI and M_PI_2 in building

[sampie]

hi!!

i found an error when building with VC++ 2010:
error C2065: 'M_PI' : undeclared identifier

also for the M_PI_2

first i added #define _USE_MATH_DEFINES but it seems to not solve the problem, and then i tried to search on the net to see the cause, i found this site:
http://connect.microsoft.com/VisualStudio/feedback/details/344610/visual-c-2008-standard-m-pi-is-not-defined

it's a bug in VC++ in order to fix it i defined the M_PI_2 and M_PI in this files:
arGetTransMat2.cpp
rpp_quintic.cpp
rpp.cpp

#define M_PI 3.14159265358979323846
#define M_PI_2 1.57079632679489661923

if you find my code useful add it.

thanks