#include?“raytracer.h“
#include?“scene.h“
#include?“common.h“
#include?“windows.h“
#include?“winbase.h“
#include?“math.h“
#include?
#define?M_PI?3.141592653589
namespace?Raytracer?{

Ray::Ray（?vector3&?a_Origin?vector3&?a_Dir?）?:?
	m_Origin（?a_Origin?）?
	m_Direction（?a_Dir?）
{
}

Engine::Engine（）
{
	m_Scene?=?new?Scene（）;
}

Engine::~Engine（）
{
	delete?m_Scene;
}

//?-----------------------------------------------------------
//?Engine::SetTarget
//?Sets?the?render?target?canvas
//?-----------------------------------------------------------
void?Engine::SetTarget（?Pixel*?a_Dest?int?a_Width?int?a_Height?）
{
	//?set?pixel?buffer?address?&?size
	m_Dest?=?a_Dest;
	m_Width?=?a_Width;
	m_Height?=?a_Height;
}

//?-----------------------------------------------------------
//?Engine::Raytrace
//?Naive?ray?tracing:?Intersects?the?ray?with?every?primitive
//?in?the?scene?to?determine?the?closest?intersection
//?-----------------------------------------------------------
Primitive*?Engine::Raytrace（?Ray&?a_Ray?Color&?a_Acc?int?a_Depth?float?a_RIndex?float&?a_Dist?）
{
	if?（a_Depth?>?TRACEDEPTH）?return?0;
	//?trace?primary?ray
	a_Dist?=?1000000.0f;
	vector3?pi;
	Primitive*?prim?=?0;
	int?result;
	//?find?the?nearest?intersection
	for?（?int?s?=?0;?s?GetNrPrimitives（）;?s++?）
	{
		Primitive*?pr?=?m_Scene->GetPrimitive（?s?）;
		int?res;
		if?（res?=?pr->Intersect（?a_Ray?a_Dist?））?
		{
			prim?=?pr;
			result?=?res;?//?0?=?miss?1?=?hit?-1?=?hit?from?inside?primitive
		}
	}
	//?no?hit?terminate?ray
	if?（!prim）?return?0;
	//?handle?intersection
	if?（prim->IsLight（））
	{
		//?we?hit?a?light?stop?tracing
		a_Acc?=?Color（?1?1?1?）;
	}
	else
	{
		//?determine?color?at?point?of?intersection
		pi?=?a_Ray.GetOrigin（）?+?a_Ray.GetDirection（）?*?a_Dist;//交?
		//?trace?lights
		for?（?int?l?=?0;?l?GetNrPrimitives（）;?l++?）
		{
			Primitive*?p?=?m_Scene->GetPrimitive（?l?）;
			if?（p->IsLight（））?
			{
				Primitive*?light?=?p;
				//intersection?part
				float?shade?=?1.0f;
				if?（light->GetType（）?==?Primitive::SPHERE）
				{
					vector3?L?=?（（Sphere*）light）->GetCentre（）?-?pi;
					float?tdist?=?LENGTH（?L?）;
					L?*=?（1.0f?/?tdist）;
					Ray?r?=?Ray（?pi?+?L?*?EPSILON?L?）;
					for?（?int?s?=?0;?s?GetNrPrimitives（）;?s++?）
					{
						Primitive*?pr?=?m_Scene->GetPrimitive（?s?）;
						if?（（pr?!=?light）?&&?（pr->Intersect（?r?tdist?）））
						{
							shade?=?0;
							break;
						}
					}
				}
//				if?（light->GetType（）?==?Primitive::CYLINDER）
//				{
//					vector3?L?=?（（Sphere*）light）->GetCentre（）?-?pi;
//					float?tdist?=?LENGTH（?L?）;
//					L?*=?（1.0f?/?tdist）;
//					Ray?r?=?Ray（?pi?+?L?*?EPSILON?L?）;
//					for?（?int?s?=?0;?s?GetNrPrimitives（）;?s++?）
//					{
//						Primitive*?pr?=?m_Scene->GetPrimitive（?s?）;
//						if?（（pr?!=?light）?&&?（pr->Intersect（?r?tdist?）））
//						{
//							shade?=?0;
//					

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2016-06-01?14:46??圖形學光線追蹤\
?????目錄???????????0??2016-06-01?14:42??圖形學光線追蹤\Graphic_ray_tracing\
?????文件?????1440015??2016-06-01?14:40??圖形學光線追蹤\Graphic_ray_tracing\000a.ppm
?????文件????????3088??2009-04-26?23:27??圖形學光線追蹤\Graphic_ray_tracing\common.h
?????文件???????????3??2016-05-30?17:30??圖形學光線追蹤\Graphic_ray_tracing\in.txt
?????文件???????????0??2016-05-30?17:32??圖形學光線追蹤\Graphic_ray_tracing\out.txt
?????文件???????12903??2016-06-01?14:40??圖形學光線追蹤\Graphic_ray_tracing\raytracer.cpp
?????文件????????4180??2016-05-30?10:04??圖形學光線追蹤\Graphic_ray_tracing\raytracer.dsp
?????文件?????????541??2004-07-08?16:04??圖形學光線追蹤\Graphic_ray_tracing\raytracer.dsw
?????文件????????1525??2016-06-01?14:35??圖形學光線追蹤\Graphic_ray_tracing\raytracer.h
?????文件???????91136??2016-06-01?14:41??圖形學光線追蹤\Graphic_ray_tracing\raytracer.ncb
?????文件???????51712??2016-06-01?14:41??圖形學光線追蹤\Graphic_ray_tracing\raytracer.opt
?????文件????????1831??2016-06-01?14:40??圖形學光線追蹤\Graphic_ray_tracing\raytracer.plg
?????文件?????????882??2009-04-23?02:05??圖形學光線追蹤\Graphic_ray_tracing\raytracer.sln
?????文件???????18432??2009-05-05?11:41??圖形學光線追蹤\Graphic_ray_tracing\raytracer.suo
?????文件????????6674??2009-04-23?02:05??圖形學光線追蹤\Graphic_ray_tracing\raytracer.vcproj
?????文件????????1413??2009-05-05?11:41??圖形學光線追蹤\Graphic_ray_tracing\raytracer.vcproj.STREAKLY.Starseeker.user
?????文件????????7664??2016-06-01?12:18??圖形學光線追蹤\Graphic_ray_tracing\scene.cpp
?????文件????????4369??2016-06-01?11:01??圖形學光線追蹤\Graphic_ray_tracing\scene.h
?????文件????????4711??2009-04-23?00:18??圖形學光線追蹤\Graphic_ray_tracing\surface.cpp
?????文件?????????856??2009-04-23?00:18??圖形學光線追蹤\Graphic_ray_tracing\surface.h
?????文件????????3929??2016-06-01?12:40??圖形學光線追蹤\Graphic_ray_tracing\testapp.cpp
?????文件???171230898??2016-06-01?13:38??圖形學光線追蹤\ray_tracing_劉恒.avi
?????文件??????163177??2016-06-01?14:28??圖形學光線追蹤\圖形學大作業.pdf