Swap yaw and pitch in camera computation. Add functions to convert view matrix to camera position, and camera position to camera yaw pitch roll.

examples/Benchmarks/BenchmarkDemo.cpp

@@ -110,10 +110,10 @@ class BenchmarkDemo : public CommonRigidBodyMTBase
 	void resetCamera()
 	{
 		float dist = 120;
-		float pitch = 52;
-		float yaw = 35;
+		float pitch = -35;
+		float yaw = 52;
 		float targetPos[3]={0,10.46,0};
-		m_guiHelper->resetCamera(dist,pitch,yaw,targetPos[0],targetPos[1],targetPos[2]);
+		m_guiHelper->resetCamera(dist,yaw,pitch,targetPos[0],targetPos[1],targetPos[2]);
 	}
 };
 
@@ -1315,4 +1315,4 @@ void	BenchmarkDemo::exitPhysics()
 CommonExampleInterface*    BenchmarkCreateFunc(struct CommonExampleOptions& options)
 {
 	return new BenchmarkDemo(options.m_guiHelper,options.m_option);
-}
+}