extern GLfloat zoomFactor, camRotateFactor, camAngleFactor;
extern GLfloat leftrightFactor, nearfarFactor, bigsmallFactor;
extern GLfloat updownFactor, rotateFactor, texscaleFactor;
extern GLfloat zoomFactor, camRotateFactor, camAngleFactor;
extern GLfloat leftrightFactor, nearfarFactor, bigsmallFactor;
extern GLfloat updownFactor, rotateFactor, texscaleFactor;