ray.h

file code.zip are used to implement ray tracing technology.

#ifndef _RAY_COMMON_
#define _RAY_COMMON_

#include "common.h"
#include "affine.h"

//Maximum number of hits for a single ray
#define maxNumHits 20

// Need to declare class for Ray & hitInfo classes
class GeomObj;

//@@@@@@@@@@@@@@@@@@ HitInfo @@@@@@@@@@@@@@@@@@@@
class HitInfo
{ // data for each hit with a surface
public:
    double hitTime;    		// the hit time
    GeomObj* hitObject;  	// the object hit
    int surface;		// which surface is hit?
    int isEntering;		// is ray entering the object?
    Point3 hitPoint;		// hit point
    Vector3 hitNormal;		// normal at hit point

    HitInfo();
    void set(HitInfo& h);
};

//@@@@@@@@@@@@@@@@@ Intersection @@@@@@@@@@@@@@@@@@@@@
class Intersection
{ // hold the hit list
public:
    int numHits;			// the number of hits
    HitInfo hit[maxNumHits];		// list of hits

    Intersection();

    void set(Intersection& intr);
    void sort();
};

//@@@@@@@@@@@@@@@@@@@@ light class @@@@@@@@@@@@@@@@@@@

// Linked list of light sources
class Light
{
public:
    Point3 pos;
    Color3 color;
    Light* next;

    Light() {next = NULL;}

    void setPosition(Point3 p){pos.set(p);}
    void setColor(Color3 c){color.set(c);}
};

//@@@@@@@@@@@@@@@@@@@@ Ray @@@@@@@@@@@@@@@@@@@@@@@@@
class Ray
{
public:
    // Constructors
    Ray();										// Initialize all values empty
    Ray(Point3& origin);						// Set origin of ray
    Ray(Point3& origin, Vector3& direction);	// Set origin and direction of ray
    Ray(Point3& origin, Light *L);				// Set origin and direct towards light

    void set(Ray& copyMe);

    // Accessor Functions
    void setStart(float x, float y, float z);
    void setStart(Point3& p);
    Point3& getStart();

    void setDir(float x, float y, float z);
    void setDir(Vector3& v);
    void setDir(Light *L);
    Vector3& getDir();

    void setRecurseLevel(int newLevel);
    int getRecurseLevel();

    void setAttenuation(float newAttenuation);
    void accumulateAttenuation(float newAttenuation);
    float getAttenuation();

    HitInfo* getHit();
    void setHit(HitInfo *hit);
    
    // Miscelaneous Functions
    Point3 calculatePointOnRay(float t);
    void nudgeForward(float epsilon);	//To avoid unwanted self occlusion
    void nudgeForward();

private:
    Point3 start;	// Origin of Ray
    Vector3 dir;	// Direction of Ray
    HitInfo *hit;	// Information about the first intersection along the ray

	int recurseLevel;		// Current level in recursion tree
    float attenuation;		// The attenuation of the energy present in the light ray

    void setDefaults();		// Set all variables to default values
};

#endif