Camera.cpp

#include "Camera.h"

Camera::Camera(void)
{
  this->Up = Vector3::unitY;
...
}

Camera.h

#pragma once

#include "Vector3.h"

class Camera
{
public:
	Camera(void);
  
...
  
}

Vector3.cpp

#include "Vector3.h"

const Vector3 Vector3::up = Vector3(0, 1, 0);

...

Vector3.h

#pragma once

struct Vector3
{
	Vector3();
	Vector3(float,float,float);
	
	float x,y,z;
	
	static const Vector3 up;
}