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反射光線地圖 (Direct3D 9)

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當光源亮起時，光亮物件 - 使用高度反射材質的物件 - 接收反射醒目提示。 在某些情況下，光源模組所產生的反射醒目提示不正確。 為了產生更吸引人的醒目提示，許多 Direct3D 應用程式會將反射光線對應套用至基本類型。

若要執行反射光線對應，將反射光線對應新增至基本類型的紋理，然後調變（將結果乘以）RGB 光線對應。

下列程式碼範例說明 C++ 中的此程式。

// This example assumes that d3dDevice is a valid pointer to an
// IDirect3DDevice9 interface.
// lptexBaseTexture is a valid pointer to a texture.
// lptexSpecLightMap is a valid pointer to a texture that contains RGB
// specular light map data.
// lptexLightMap is a valid pointer to a texture that contains RGB
// light map data.

// Set the base texture.
d3dDevice->SetTexture(0, lptexBaseTexture );

// Set the base texture operation and arguments.
d3dDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE );
d3dDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE );
d3dDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE );

// Set the specular light map.
d3dDevice->SetTexture(1, lptexSpecLightMap);

// Set the specular light map operation and args.
d3dDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_ADD );
d3dDevice->SetTextureStageState(1, D3DTSS_COLORARG1, D3DTA_TEXTURE );
d3dDevice->SetTextureStageState(1, D3DTSS_COLORARG2, D3DTA_CURRENT );

// Set the RGB light map.
d3dDevice->SetTexture(2, lptexLightMap);

// Set the RGB light map operation and arguments.
d3dDevice->SetTextureStageState(2,D3DTSS_COLOROP, D3DTOP_MODULATE);
d3dDevice->SetTextureStageState(2,D3DTSS_COLORARG1, D3DTA_TEXTURE );
d3dDevice->SetTextureStageState(2,D3DTSS_COLORARG2, D3DTA_CURRENT );

具有紋理的光線對應