Retrieve Roll/Pitch/Yaw From Transform Matrix

In my code I wanted to retrieve the the roll, pitch and yaw of the camera in a client-side script for use in an artifical horizion/compass.

After some piecing together of various code in the forums I managed to cobble together the following console function.

ConsoleFunction( GetEulerAngles, const char*, 2, 2, "(MatrixF xfrm) Retrieve euler angles from transformation matrix.")
{
   Point3F pos1;
   AngAxisF aa1(Point3F(0,0,0),0);
   dSscanf(argv[1], "%g %g %g %g %g %g %g", &pos1.x, &pos1.y, &pos1.z, &aa1.axis.x, &aa1.axis.y, &aa1.axis.z, &aa1.angle);

   MatrixF objTx(true);
   aa1.setMatrix(&objTx);
   objTx.setColumn(3, pos1);
   
   // Get rotations from transform matrix   
   
   VectorF vec;   
   objTx.getColumn(1,&vec);   
   
   // Get X-vector for roll calculation   
   
   Point3F xv;   
   objTx.getColumn(0,&xv);   
   
   // Calculate PRH (x = pitch, y = roll, z = heading)   
   
   Point3F rot(-mAtan(vec.z, mSqrt(vec.x*vec.x + vec.y*vec.y)), mDot(xv,Point3F(0,0,1)), -mAtan(-vec.x,vec.y) );      
   
   // Set up vars   
   
   F32 pitch = mRadToDeg(rot.x);	 // Pitch   
   F32 yaw = mRadToDeg(rot.z);		 // Heading   
   F32 roll = mRadToDeg(rot.y);		 // Roll

   char* ret = Con::getReturnBuffer(256);
   dSprintf(ret, 255, "%g %g %g", pitch, yaw + 180, roll);
   return ret;
}

Simply drop the code into your engine code. I stuck it in "math/mathTypes.cc" for need of a better location, but i'll tidy that up later.

Re-compile the engine and drop the following into a client side scirpt

%transform = localClientConnection.player.getEyeTransform();   
%angles = getEulerAngles(%transform);

%pitch = getWord(%angles, 0); 
%yaw = getWord(%angles, 1); 
%roll = getWord(%angles, 2);

Hopefully its helpful to somebody.