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File: ThinFilm.fx



Copyright NVIDIA Corporation 2003

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED

*AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS

OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY

AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS

BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES

WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,

BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS)

ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF NVIDIA HAS

BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

*/



//ThinFilm2.fx



//////////////////////////////////////////////////////////////////////////

// untweakables //////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////



float Script : STANDARDSGLOBAL <

    string UIWidget = "none";

    string ScriptClass = "object";

    string ScriptOrder = "standard";

    string ScriptOutput = "color";

    string Script = "Technique=ThinFilm;";

> = 0.8;



float4x4 WorldITXf : WorldInverseTranspose < string UIWidget="None"; > = {1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1};

float4x4 WvpXf : WorldViewProjection < string UIWidget="None"; >;

float4x4 WorldXf : World < string UIWidget="None"; >;

float4x4 ViewIXf : ViewInverse < string UIWidget="None"; >;



//////////////////////////////////////////////////////////////////////////

// tweakables ////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////



// Point Light 1 ////



float3 LightPosP1 : POSITION <

	string UIName = "Light Pos 1";

	string Object = "PointLight";

	string Space = "World";

> = {-10.0f, 10.0f, -10.0f};



// float4   EyeVector = {0,0,1,0};



float3 SurfColor : DIFFUSE <

	string UIName = "Color Name";

	string UIWidget = "Color";

> = {0.3f, 0.3f, 0.5f};



float SpecExpon : SpecularPower <

	string UIName = "Spec Power";

	string UIWidget = "slider";

	float UIMin = 1.0;

	float UIMax = 128.0;

	float UIStep = 1.0;

> = 12.0f;



#include <include\\ThinFilmTex.fxh>



//////////////////////////////////////////////////////////////////////////

// structs ///////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////



struct appData

{

    float4 Position : POSITION;

    float4 Normal   : NORMAL;

};



struct vertexOutput

{

    float4 HPOS      : POSITION;

    float4 diffCol   : COLOR0;

    float4 specCol   : COLOR1;

    float2 filmDepth : TEXCOORD0;

};



//////////////////////////////////////////////////////////////////////////

// VERTEX SHADER /////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////



vertexOutput ThinFilmVS(appData IN,uniform float3 LightPos)

{

    vertexOutput OUT;

    float3 Nn = mul(IN.Normal,WorldITXf).xyz;

    float4 Po = float4(IN.Position.xyz,1.0);	// object coordinates

    float3 Pw = mul(Po,WorldXf).xyz;		// world coordinates

    OUT.HPOS = mul(Po,WvpXf);	// screen clipspace coords

    float3 Ln = normalize(LightPos - Pw);

    float3 Vn = normalize(ViewIXf[3].xyz - Pw);	// obj coords

    float3 Hn = normalize(Ln + Vn);

    float4 litV = lit(dot(Ln,Nn),dot(Hn,Nn),SpecExpon);

    OUT.diffCol = (float4)litV.y;

    OUT.specCol = (float4)pow(dot(Hn,Nn),SpecExpon); // (float4)litV.z;

    // OUT.specCol = litV.zzzz;   // bug in lit() ?

    // compute the view depth for the thin film

    // float viewdepth = (1.0 / dot(Nn,Vn)) * FilmDepth.x;

    float viewdepth = calc_view_depth(dot(Nn,Vn),FilmDepth.x);

    OUT.filmDepth = viewdepth.xx;

    return OUT;

}



///////// /////////////////////////////////////////////////////////////////

// PIXEL SHADER //////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////



float4 ThinFilmPS(vertexOutput IN) : COLOR

{

    // lookup fringe value based on view depth

    float3 fringeCol = (float3)tex2D(FringeMapSampler, IN.filmDepth);

    // modulate specular lighting by fringe color, combine with regular lighting

    float3 rgb = fringeCol*IN.specCol + IN.diffCol*SurfColor;

    return float4(rgb,1);

}



//////////////////////////////////////////////////////////////////////////

// TECHNIQUE /////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////



technique ThinFilm <

	string Script = "Pass = P0";

> {

    pass P0 < string Script = "Draw=geometry;"; > {

        VertexShader = compile vs_2_0 ThinFilmVS(LightPosP1);

		ZEnable = true;

		ZWriteEnable = true;

		CullMode = None;

        PixelShader  = compile ps_2_0 ThinFilmPS();

    }

}



/////////////////////////////////// eof ///

]]></effect><effect path="f:\devrel\sdk\media\hlsl\include\\thinfilmtex.fxh"><![CDATA[/*

File: ThinFilm.fx



Copyright NVIDIA Corporation 2003

TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED

*AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS

OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY

AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS

BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES

WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,

BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS)

ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF NVIDIA HAS

BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

*/



// Declarations for thinfilm effect



#ifndef _H_THINFILMTEX

#define _H_THINFILMTEX



//////////////////////////////////////////////////////////////////////////

// tweakables ////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////



float FilmDepth <

	string UIName = "Film Thickness";

	string UIWidget = "slider";

	float UIMin = 0.0;

	float UIMax = 0.25;

	float UIStep = 0.001;

> = 0.05f;



//============================================================================

// texture samplers

//============================================================================



#define FILM_TEX_SIZE 256



texture fringeMap <

    string function = "CreateFringeMap";

    string UIWidget = "None";

    int width = FILM_TEX_SIZE;

    int height = 1;	// 1D lookup

>;



sampler FringeMapSampler = sampler_state 

{

    Texture   = <fringeMap>;

    MinFilter = LINEAR;

    MagFilter = LINEAR;

    MipFilter = LINEAR;

    AddressU  = WRAP;

    AddressV  = CLAMP;

};



float4 CreateFringeMap(float2 Pos:POSITION, float2 Psize : PSIZE) : COLOR

{

    // these lambdas are in 100's of nm,

    //  they represent the wavelengths of light for each respective 

    //  color channel.  They are only approximate so that the texture

    //  can repeat.

	float3 lamRGB = float3(6,5,4); // (600,500,400)nm - should be more like (600,550,440)

    // these offsets are used to perturb the phase of the interference

    //   if you are using very thick "thin films" you will want to

    //   modify these offests to avoid complete contructive interference

    //   at a particular depth.. Just a tweak able.

	float3 offsetRGB = (0).xxx;

    // p is the period of the texture, it is the LCM of the wavelengths,

    //  this is the depth in nm when the pattern will repeat.  I was too

    //  lazy to write up a LCM function, so you have to provide it.

    float p = 60;   //lcm(6,5,4)

    // vd is the depth of the thin film relative to the texture index

    float vd = p;

    // now compute the color values using this formula:

    //  1/2 ( Sin( 2Pi * d/lam* + Pi/2 + O) + 1 )

    //   where d is the current depth, or "i*vd" and O is some offset* so that

    //   we avoid complete constructive interference in all wavelenths at some depth.

    float pi = 3.1415926535f;

	float3 rgb = 0.5*(sin(2*pi*(Pos.x*vd)/lamRGB + pi/2.0 + offsetRGB) + 1);

    return float4(rgb,0);

}



//////////////////////////////////////////////////////////////////////////

// Function to Index this texture - use in vertex or pixel shaders ///////

//////////////////////////////////////////////////////////////////////////



float calc_view_depth(float NDotV,float Thickness)

{

    // return (1.0 / NDotV) * Thickness;

    return (Thickness / NDotV);

}





#endif /* _H_THINFILMTEX */



/////////////////////////////////// eof ///

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