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objectguid="1394174672_42515_16399_189_63_62_31_182_9_209_60" objectname="NVScene Object" progid="nvsys.NVScene.1"/><object objectid="4" objectguid="1401340335_59252_17807_172_96_248_52_119_74_181_173" objectname="NVMaterial Object" progid="nvsys.NVMaterial.1"/><object objectid="5" objectguid="1675712286_15683_20022_149_108_42_250_122_123_231_64" objectname="NVCamera Object" progid="nvsys.NVCamera.1"/><object objectid="6" objectguid="2342579002_10168_19906_178_150_26_144_17_106_220_182" objectname="NVTransformLink Object" progid="nvsys.NVTransformLink.1"/><object objectid="2" objectguid="3275223899_28196_19999_162_153_111_232_35_119_165_23" objectname="NVParameterList Object" progid="nvsys.NVParameterList.1"/></objects><media_objects><effect path="E:\sw\devrel\SDK\MEDIA\HLSL\raytrace_spheres.fx"><![CDATA[// Simple ray tracer in a pixel shader

// - based on Paul Heckbert's code from "An Introduction to Ray Tracing"

// - it only supports spheres currently

// sgreen@nvidia.com

// v1.1 - fixed camera, updated to use if statements, added checkerboard floor

// $Id: //sw/devrel/SDK/MEDIA/HLSL/raytrace_spheres.fx#2 $



float Script : STANDARDSGLOBAL <

	string UIWidget = "none";

	string ScriptClass = "scene";

	string ScriptOrder = "standard";

	string ScriptOutput = "color";

	string Script = "Technique=PS20;";

> = 0.8; // version #



float4x4 view : ViewInverse < string UIWidget = "none"; >;

float time : Time < string UIWidget = "none"; >;



float2 viewport : VIEWPORTPIXELSIZE < string UIWidget = "none"; >;



float foclen <

	string UIWidget="Slider";

	string UIName="Focal Length";

	float UIMin = 1.0f;

	float UIMax = 5000.0f;

	float UIStep = 10.0f;

> = 500.0;



float3 lightPosition : POSITION

<

	string UIName="Light Position";

	string Object = "PointLight";

	string Space = "World";

> = { 10.0, 10.0, -10.0 };



float4 lightColor : DIFFUSE

<

    string UIName = "Light Color";

    string Object = "PointLight";

> = { 1.0, 1.0, 1.0, 1.0 };



float shininess

<

	string UIWidget = "slider";

	float UIMin = 1.0f;

	float UIStep = 1.0f;

	float UIMax = 100.0f;

> = 40.0;



float4 backgroundColor : DIFFUSE

<

	string UIName="Background Color";

	string UIWidget = "color";

> = { 0.0, 0.0, 0.0, 1.0 };



// build a 2D texture with a Whitted-style checkerboard pattern!

texture checkTexture

<

    string texturetype = "2D";

	string function = "GenerateCheck";

	int width = 256, height = 256;

>;



sampler2D checkSampler = sampler_state

{

	Texture = <checkTexture>;

	MinFilter = Linear;

	MagFilter = Linear;

	MipFilter = Linear;

};



float4 GenerateCheck(float2 p : POSITION) : COLOR

{

	float4 c1 = { 1.0, 0.0, 0.0, 1.0 };

	float4 c2 = { 1.0, 1.0, 0.0, 1.0 };

	float2 s = step(p, 0.5);

	float check = (s.x || s.y) && !(s.x && s.y);	// no XOR in HLSL!

	return lerp(c1, c2, check);

}



struct Ray {

	float3 o;	// origin

	float3 d;	// direction

};



struct Sphere {

  float3 centre;

  float rad2;	// radius^2

  float4 color;

  float Kd, Ks, Kr;

};



// Object database stored in constants

#define SQR(N) (N*N)

#define NOBJECTS 3

static Sphere object[NOBJECTS] = {

	{

		0.0, 0.0, 0.0,

		SQR(1.0),

		0.0, 0.5, 1.0, 1.0,

		1.0, 1.0, 0.5,

	},

	{

		1.5, -0.5, 0.0,

		SQR(0.5),

		0.0, 1.0, 0.0, 1.0,

		1.0, 1.0, 0.5,

	},	

	{

		0.0, -101.0, 0.0,

		SQR(100.0),

//		0.0, 0.0, 1.0, 1.0

		1.0, 1.0, 1.0, 1.0,

		1.0, 1.0, 0.5,

	}

};

const float eps = 0.001;	// error epsilon



float SphereIntersect(Sphere s, Ray ray, out bool hit)

{

  float3 v = s.centre - ray.o;

  float b = dot(v, ray.d);

  float disc = (b*b) - dot(v, v) + s.rad2;



  hit = true;

  // note - early returns not supported by HLSL compiler currently:

//  if (disc<=0) return -1.0; // ray misses

  if (disc<=0) hit = false;;



  disc = sqrt(disc);

  float t2 = b + disc;



//  if (t2<=eps) return -1.0; // behind ray origin

  if (t2<=eps) hit = false; // behind ray origin



  float t1 = b - disc;



  if ((t1>eps) && (t1<t2))  // return nearest intersection

    return t1;

  else

    return t2;

}



float3 SphereNormal(Sphere s, float3 i)

{

	return normalize(i - s.centre);

}



// find nearest hit

// returns intersection point

float3 NearestHit(Ray ray, out int hitobj, out bool anyhit)

{

	float mint = 1e10;

	hitobj = -1;

 	anyhit = false;

	for(int i=0; i<NOBJECTS; i++) {

		bool hit;

		float t = SphereIntersect(object[i], ray, hit);

		if (hit) {

			if (t < mint) {

				hitobj = i;

				mint = t;

				anyhit = true;

			}

		}

	}

	return ray.o + ray.d*mint;

}



// test for any hit (for shadow rays)

bool AnyHit(Ray ray)

{

	bool anyhit = false;

	for(int i=0; i<NOBJECTS; i++) {

		bool hit;

		float t = SphereIntersect(object[i], ray, hit);

		if (hit) {

//			return true;

			anyhit = true;

		}

	}

	return anyhit;

}



// Phong lighting model

float4 Phong(float3 n, float3 l, float3 v, float shininess, float4 diffuseColor, float4 specularColor)

{

	float ndotl = dot(n, l);

	float diff = saturate(ndotl);

	float3 r = reflect(l, n);

	float spec = pow(saturate(dot(v, r)), shininess) * (ndotl > 0.0);

	return diff*diffuseColor + spec*specularColor;

}



float4 Shade(float3 i, float3 n, float3 v, int hitobj)

{

	float3 l = normalize(lightPosition - i);



	// check if shadowed

	Ray shadowray;

	shadowray.o = i;

	shadowray.d = l;

	bool shadowed = AnyHit(shadowray);



	// lighting

	float4 diff = object[hitobj].color * object[hitobj].Kd;

	if (hitobj==2) {

		diff *= tex2D(checkSampler, i.xz);	// floor texture

	}

	float4 spec = lightColor * object[hitobj].Ks;

	float shadowFactor = 0.25 + 0.75*!shadowed;	

	

	return Phong(n, l, v, shininess, diff, spec) * shadowFactor;

}



// Vertex shader

struct Vertex {

    float4 pos		: POSITION;

    float4 texcoord	: TEXCOORD0;

};



Vertex RayTraceVS(Vertex v)

{

    return v;

}



void animate_scene(float time)

{

	object[1].centre.x = sin(time)*1.5;

	object[1].centre.z = cos(time)*1.5;

}



// Pixel shader

float4 RayTracePS(Vertex IN) : COLOR

{

	animate_scene(time);

	

	// calculate eye ray

	float3 d;

	d.xy = ((IN.texcoord*2.0)-1.0) * viewport;

	d.y = -d.y;	// flip y axis

	d.z = foclen;



	// transform by view matrix

	Ray eyeray;

	eyeray.o = mul(float4(0, 0, 0, 1), view);

	eyeray.d = mul(d, (float3x3) view);

	eyeray.d = normalize(eyeray.d);



	// find nearest hit

	int hitobj;

	bool hit;

	float3 i = NearestHit(eyeray, hitobj, hit);

	float4 c = 0;

	if (hit) {

		// shade surface

		float3 n = SphereNormal(object[hitobj], i);

		c = Shade(i, n, eyeray.d, hitobj);

	

		// shoot reflection ray

		float3 r = reflect(eyeray.d, n);

		Ray reflray;

		reflray.o = i;

		reflray.d = r;

		int hitobj2;

		i = NearestHit(reflray, hitobj2, hit);

		if (hit) {

			n = SphereNormal(object[hitobj2], i);

			c += Shade(i, n, reflray.d, hitobj2) * object[hitobj].Kr;

		} else {

			c += backgroundColor;

		}

	} else {

		c = backgroundColor;

	}



	return c;

}



technique PS20 <

		string Script = "pass=p0;";

	>

{

    pass p0 <

		string Script = "Draw=Buffer;";

	> 

    {

		VertexShader = compile vs_1_1 RayTraceVS();

		PixelShader = compile ps_2_a RayTracePS();

    }

}



technique PS30 <

		string Script = "pass=p0;";

	>

{

    pass p0<

		string Script = "Draw=Buffer;";

	>    {

		VertexShader = compile vs_3_0 RayTraceVS();

		PixelShader = compile ps_3_0 RayTracePS();

    }

}

]]></effect></media_objects></fxstudio_project>