HLSL与贴图的有关问题

HLSL与贴图的问题
各位：
我下载了一个PSSM的DEMO(http://appsrv.cse.cuhk.edu.hk/~fzhang/pssm_vrcia/)
然后加入了DXSDK的那个木头小螺旋桨飞机，但贴图无法正确地贴上去，感觉上是错位了。请各位帮忙看看我改写的HLSL是否有问题：
#define SMAP_SIZE 64//512


#define SHADOW_EPSILON 0.005f




float4x4 g_mViewProj;

void VS_RenderShadowMap(
  float4 vPos : POSITION,
  out float4 vPosOut : POSITION,
  out float3 vPixelOut : TEXCOORD0)
{
  // pass vertex position through as usual
  vPosOut = mul(vPos, g_mViewProj);
  // output pixel pos
  vPixelOut=vPosOut.xyz;
}

float4 PS_RenderShadowMap(float3 vPixelPos : TEXCOORD0): COLOR
{
  // write z coordinate (linearized depth) to texture
  return vPixelPos.z;
}


// This technique is used when rendering meshes to the shadowmap
// 
technique RenderShadowMap
{
  pass p0
  {
  // render back faces to hide artifacts
  CullMode = CW;
  VertexShader = compile vs_2_0 VS_RenderShadowMap();
  PixelShader = compile ps_2_0 PS_RenderShadowMap();
  }
}




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



float3 g_vLightDir;
float3 g_vLightColor;
float3 g_vAmbient;
float g_fShadowMapSize;
float4x4 g_mShadowMap;

float4x4 g_mWorldView;
float4x4 g_mProj;
float4x4 g_mViewToLightProj; // Transform from view space to light projection space
float4 g_vMaterial;
texture g_txScene;
texture g_txShadow;




// no filtering in floating point texture
sampler2D g_samShadowMap =
sampler_state
{
  MinFilter = Point;
  MagFilter = Point;
  MipFilter = None;
  AddressU = Border;
  AddressV = Border;
  BorderColor = 0xFFFFFFFF;
};
sampler2D g_samScene =
sampler_state
{
  Texture = <g_txScene>;
  MinFilter = Point;
  MagFilter = Linear;
  MipFilter = Linear;
};


sampler2D g_samShadow =
sampler_state
{
  Texture = <g_txShadow>;
  MinFilter = Point;
  MagFilter = Point;
  MipFilter = Point;
  AddressU = Clamp;
  AddressV = Clamp;
};



void VS_Shadowed(
  in float4 vPos : POSITION,
  in float3 vNormal : NORMAL,
  in float fAmbientIn : TEXCOORD0,
  in float2 iTex : TEXCOORD1,
  
  
  out float4 vPosOut : POSITION,
  out float4 vShadowTex : TEXCOORD0,
  out float fAmbientOut : TEXCOORD1,
  out float2 Tex : TEXCOORD2,
  out float3 vDiffuse : COLOR0)
{
  // pass vertex position through as usual
  vPosOut = mul(vPos, g_mViewProj);
  
  // calculate per vertex lighting
  vDiffuse = g_vLightColor * saturate(dot(-g_vLightDir, vNormal));

  // coordinates for shadowmap
  vShadowTex = mul(vPos, g_mShadowMap);

  // ambient occlusion
  fAmbientOut = saturate(0.5f+fAmbientIn);
  Tex=mul(iTex, g_mViewProj);
}

float4 PS_Shadowed(
  float4 vShadowTex : TEXCOORD0,
  float fAmbientOcclusion : TEXCOORD1,
  float2 Tex : TEXCOORD2,
  float4 vDiffuse : COLOR0) : COLOR
{

  float fTexelSize=1.0f/g_fShadowMapSize;

  // project texture coordinates
  vShadowTex.xy/=vShadowTex.w;
  
  // 2x2 PCF Filtering
  // 
  float fShadow[4];
  //fShadow[0] = (vShadowTex.z < tex2D(g_samShadowMap, vShadowTex).r);

  //fShadow[1] = (vShadowTex.z < tex2D(g_samShadowMap, vShadowTex + float2(fTexelSize,0)).r);
  //fShadow[2] = (vShadowTex.z < tex2D(g_samShadowMap, vShadowTex + float2(0,fTexelSize)).r);
  //fShadow[3] = (vShadowTex.z < tex2D(g_samShadowMap, vShadowTex + float2(fTexelSize,fTexelSize)).r);
  
  fShadow[0] = (vShadowTex.z < tex2D(g_samShadow, vShadowTex).r);
  fShadow[1] = (vShadowTex.z < tex2D(g_samShadow, vShadowTex + float2(fTexelSize,0)).r);
  fShadow[2] = (vShadowTex.z < tex2D(g_samShadow, vShadowTex + float2(0,fTexelSize)).r);
  fShadow[3] = (vShadowTex.z < tex2D(g_samShadow, vShadowTex + float2(fTexelSize,fTexelSize)).r);
  
  float2 vLerpFactor = frac(g_fShadowMapSize * vShadowTex);
  float fLightingFactor = lerp(lerp( fShadow[0], fShadow[1], vLerpFactor.x ),
  lerp( fShadow[2], fShadow[3], vLerpFactor.x ),
  vLerpFactor.y);

  // multiply diffuse with shadowmap lookup value
  vDiffuse*=fLightingFactor;
  
  // final color
  float4 vColor=1;
  vColor.rgb = saturate(g_vAmbient*fAmbientOcclusion + vDiffuse).rgb;

  vDiffuse= tex2D( g_samScene, Tex );
  
  return vColor*vDiffuse;
  //return vDiffuse;
}

// This technique is used to render the final shadowed meshes
//
technique Shadowed
{
  pass p0
  {
  // render front faces
  CullMode = CCW;
VertexShader = compile vs_2_0 VS_Shadowed();
PixelShader = compile ps_2_0 PS_Shadowed();
  }
}



[解决办法]
那你检查一下iTex 是否输入正确，可能vertex declar错误，也可能顶点定义的和shader不匹配。尤其是直接用drawsubset可能出现这种问题。如果使用drawsubset,你需要重新定义自己的vertex declare和vertexbuffer
[解决办法]
嗯，应该是顶点格式和shader中的声明不匹配。
顶点格式里面纹理坐标是TEXCOORD0，在shader里面变成TEXCOORD1了。