d3d设置材质与灯光

//-----------------------------------------------------------------------------
// Desc: 设置材质和灯光
//-----------------------------------------------------------------------------
VOID SetLight()
{
//设置材质
D3DMATERIAL9 mtrl;
ZeroMemory( &mtrl, sizeof(D3DMATERIAL9) );
mtrl.Diffuse.r = mtrl.Ambient.r = 1.0f;
mtrl.Diffuse.g = mtrl.Ambient.g = 1.0f;
mtrl.Diffuse.b = mtrl.Ambient.b = 0.0f;
mtrl.Diffuse.a = mtrl.Ambient.a = 1.0f;
g_pd3dDevice->SetMaterial(&mtrl);

//设置灯光
D3DXVECTOR3 vecDir;
D3DLIGHT9 light;
ZeroMemory( &light, sizeof(D3DLIGHT9) );
light.Type = D3DLIGHT_DIRECTIONAL;
light.Diffuse.r = 1.0f;
light.Diffuse.g = 1.0f;
light.Diffuse.b = 1.0f;
vecDir = D3DXVECTOR3(cosf(timeGetTime()/350.0f),
1.0f,
sinf(timeGetTime()/350.0f) );
//vecDir = D3DXVECTOR3(1.0f, 1.0f, 0.0f);
D3DXVec3Normalize( (D3DXVECTOR3*)&light.Direction, &vecDir );
light.Range = 1000.0f;
g_pd3dDevice->SetLight( 0, &light );
g_pd3dDevice->LightEnable( 0, TRUE );
g_pd3dDevice->SetRenderState( D3DRS_LIGHTING, TRUE );

//设置环境光
g_pd3dDevice->SetRenderState( D3DRS_AMBIENT, 0x00505050);
}

通过设置旋转灯光的方向同样可以让人感觉物体在转动

材质的设置，使得我们看到物体的颜色，如果没有设置材质，而开启灯光，此时看到的物体是黑色，

因为默认情况下材质不反射任何光线。

改变g_pd3dDevice->SetRenderState( D3DRS_AMBIENT, 0xFf000000);的颜色

感受下环境光与方向光源的区别。