entity.h

#pragma once
#ifndef ENTITY_H
#define ENTITY_H

#include "vector3.h"

class Entity
{
public:
    Vector3 Pos; 
    Vector3 Rotation;
    Vector3 Hitbox; // Width, height, depth
    virtual void Render();
    Entity(Vector3 initpos, Vector3 initrotation, Vector3 inithitbox);
};
#endif

player.cpp

#include "player.h"
#include <cmath>

const double PI = 3.14159265358979323846264338329750288419716939937510582;

Player::Player() : Speed(0), Rotation(Vector3(0,0,0)), Pos(Vector3(0,0,0)), Moving(false), Name("Untitled"), StandingOn(NULL), GravitySpeed(0.f), SurfaceZ(0.f) {};

Player::Player(float initspeed, Vector3 initrot, Vector3 initpos, std::string Name) : Speed(initspeed), Rotation(initrot), Pos(initpos), Moving(false), Name(Name), StandingOn(NULL), GravitySpeed(0.f), SurfaceZ(0.f) {};

player.h

#pragma once
#ifndef PLAYER_H
#define PLAYER_H
#include <string>

#include "octree.h"
#include "block.h"
#include "entity.h"
#include "vector3.h"

class Player : public Entity
{
public:
    float Speed;
    bool Moving;
    std::string Name;
    Octree<Block*> *StandingOn;
    float SurfaceZ;
    float GravitySpeed;
    
    Player();
    Player(float initspeed, Vector3 initrot, Vector3 initpos, std::string Name);
    
    // Moves the player around
    void Forward(float amount);
    void Strafe(float amount);
    void ChangeRotation(float deltaYrot, float deltaZrot);
    void Jump(); // Begins a jump
    
    void DoStep(float amount); // Gets called every frame
};