also remove superficial CS conversion in fixCameraYawAxis

by keeping Camera oriented in OpenCV conventions instead of doing the
conversion for each SceneNode.

the latter assumes centered FOV, which is not the case

* fixed bug when norm less than eps where float array elements were left uninitialized

* cast double to float in fixing ppf norm=0 segmantation fault

* set array values 3,4,5 for normals = 0 in case of norm<eps to fix ppf segmentation fault bug