怎么样把方向光改成点光源~?

chmimi

我想用下面这段代码改``
D3DMATERIAL9 mtrl;
        mtrl.Ambient = d3d::WHITE;
        mtrl.Diffuse = d3d::WHITE;
        mtrl.Specular = d3d::WHITE;
        mtrl.Emissive = d3d::BLACK;
        mtrl.Power = 5.0f;

        Device->SetMaterial(&mtrl);

        D3DLIGHT9 dir;
        ::ZeroMemory(&dir, sizeof(dir));
        dir.Type = D3DLIGHT_DIRECTIONAL;
        dir.Diffuse = d3d::WHITE;
        dir.Specular = d3d::WHITE * 0.3f;
        dir.Ambient = d3d::WHITE * 0.6f;
        dir.Direction = D3DXVECTOR3(1.0f, 0.0f, 0.0f);

        Device->SetLight(0, &dir);
        Device->LightEnable(0, true);

        Device->SetRenderState(D3DRS_NORMALIZENORMALS, true);
        Device->SetRenderState(D3DRS_SPECULARENABLE,true);



要把dir.Type = D3DLIGHT_DIRECTIONAL;这个改成点光源,那么其他参数要怎么设置呢?

chmimi

没人知道吗?

sudongao

D3DLIGHT9 InitPointLight(D3DXVECTOR3* position, D3DXCOLOR* color)

{

    D3DLIGHT9 light;

    ::ZeroMemory(&light, sizeof(light));



    light.Type      = D3DLIGHT_POINT;

    light.Ambient   = *color * 0.6f;

    light.Diffuse   = *color;

    light.Specular  = *color * 0.6f;

    light.Position  = *position;

    light.Range        = 1000.0f;

    light.Falloff      = 1.0f;

    light.Attenuation0 = 1.0f;

    light.Attenuation1 = 0.0f;

    light.Attenuation2 = 0.0f;



    return light;

}

newcj

chmimi: 怎么样把方向光改成点光源~?

我想用下面这段代码改``
D3DMATERIAL9 mtrl;
        mtrl.Ambient = d3d::WHITE;
        mtrl.Diffuse = d3d::WHITE;...

我想对于点光源最主要的特点是有确定位置，但是无确定方向，并且有衰减，而方向光却相反，所以从方向光改成点光源，首先把方向信息删除，并且设置位置和衰减。楼上sudongao 已经给出了正解。