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Quellcode

float4x4 WorldMatrix;
float4x4 ProjMatrix;
float4 LightDir;

float4 vs_main(float4 Position : POSITION, float3 Normal : NORMAL) : POSITION
{
    float3 Norm = mul(Normal, (float3x3)WorldMatrix);
    float4 Pos = mul(Position, WorldMatrix);
        
    if (dot(-LightDir, Norm) < 0.f)
    {
        Position += LightDir * 100.f;
    }
    Position = mul(Position, WorldMatrix);
    return mul(Position, ProjMatrix);
}
        
TECHNIQUE T1
{
    PASS P1
    {
      AlphaBlendEnable = true;
      SrcBlend = Zero;
      DestBlend = One;
      ZFunc = Less;
      ZWriteEnable = false;
      StencilRef = 1;
      StencilMask = 0xFFFFFFFF;
      StencilWriteMask = 0xFFFFFFFF;
      StencilFunc = Always;
      StencilZFail = Decr;
      StencilPass = Keep;
      CullMode = CCW;
      VertexShader = compile vs_1_1 vs_main();
    }
    PASS P2
    {
        CullMode = CW;
        StencilZFail = Incr;
        VertexShader = compile vs_1_1 vs_main();
    }
}
TECHNIQUE T2
{
    PASS P0
    {
        CullMode = Ccw;
        AlphaBlendEnable = true;
        SrcBlend = SrcAlpha;
        DestBlend = InvSrcAlpha;
        ZWriteEnable = false;
        ZFunc = Less;
        StencilEnable = true;
        StencilRef = 1;
        StencilMask = 0xFFFFFFFF;
        StencilWriteMask = 0xFFFFFFFF;
        StencilFunc = Always;
        StencilZFail = Decr;
        StencilPass = Keep;
    }
    PASS P1
    {
        CullMode = Cw;
        StencilZFail = Incr;
    }
}

C-/C++-Quelltext

effect->SetTechnique("T1");
effect->SetMatrix("WorldMatrix", &(world * view));
effect->SetMatrix("ProjMatrix", &proj);
effect->SetVector("LightDir", &D3DXVECTOR4(1.f, -1.f, 1.f, 0.f));
effect->Begin(&numpasses, 0);
// alle pässe rendern

for (unsigned i = 0; i < numpasses; ++i)
{
    effect->BeginPass(i);
    shadowmesh->DrawSubset(0); // mit dem gestreckten schatten-mesh

    effect->EndPass();
}
effect->End();
        
struct shadowvertex
{
    float x, y, z;
    float rhw;
    DWORD color;
};
float maxx = static_cast<float>(GetSystemMetrics(SM_CXSCREEN));
float maxy = static_cast<float>(GetSystemMetrics(SM_CYSCREEN));

const DWORD shadowcolor = 0xff000000;

shadowvertex shadow[] = {
    {0.f, 0.f, 0.f, 1.f, shadowcolor},
    {0.f, maxy, 0.f, 1.f, shadowcolor},
    {maxx, 0.f, 0.f, 1.f, shadowcolor},
    {maxx, maxy, 0.f, 1.f, shadowcolor}
};
// ein rechteck über dem bildschirm als schatten


effect->SetTechnique("T2");
effect->Begin(&numpasses, 0);
for (unsigned i = 0; i < numpasses; ++i)
{
    effect->BeginPass(i);
    dev->DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, shadow, sizeof(shadow[0]));
    effect->EndPass();
}
effect->End();

mesh->DrawSubset(0);

Quellcode

PASS P1
{
        AlphaBlendEnable = true;
        SrcBlend = Zero;
        DestBlend = One;
        ZFunc = Always;
        ZWriteEnable = false;
        StencilEnable = true;
        StencilRef = 1;
        StencilMask = 0xFFFFFFFF;
        StencilWriteMask = 0xFFFFFFFF;
        StencilFunc = Always;
        StencilZFail = Keep;
        StencilPass = Incr;
        CullMode = CCW;
        VertexShader = compile vs_1_1 vs_main();
}
PASS P2
{
        CullMode = CW;
        StencilZFail = Keep;
        StencilPass = Decr;
        VertexShader = compile vs_1_1 vs_main();
}