Fix the fix for FPS camera rotations; use a minimum length vector when the camera is at the origin.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@1781 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CSceneNodeAnimatorCameraFPS.cpp

@@ -158,7 +158,7 @@ void CSceneNodeAnimatorCameraFPS::animateNode(ISceneNode* node, u32 timeMs)
 
 	// set target
 
-	target.set(0,0,pos.getLength());
+	target.set(0,0, core::max_(1.f, pos.getLength()));
 	core::vector3df movedir = target;
 
 	core::matrix4 mat;