擴散光線對應 (Direct3D 9)

當光源亮起時，無光表面會顯示擴散光線反射。 擴散光線的亮度，取決於與光源的距離，以及表面法向和光源方向向量之間的角度。 光源計算模擬的擴散光源效果只會產生一般效果。

您的應用程式可透過紋理光線對應模擬更複雜的擴散光源。 若要這樣做，請將擴散光線對應新增至基網底理，如下列 C++ 程式碼範例所示。

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

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

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

// Set the diffuse light map.
d3dDevice->SetTexture(1,lptexDiffuseLightMap );

// Set the blend stage.
d3dDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_MODULATE );
d3dDevice->SetTextureStageState(1, D3DTSS_COLORARG1, D3DTA_TEXTURE );
d3dDevice->SetTextureStageState(1, D3DTSS_COLORARG2, D3DTA_CURRENT );

相關主題

具有紋理的光線對應