怎么设置可以看到该模型在屏幕正中?

dcba4321

用D3DXComputeBoundingSphere得到.x文件中模型的中心点和半径,问怎么设置可以看到该模型在屏幕正中?

模型的中心点坐标是:
x=-206.564331
y=-0.077511
z=256.893127

radius=484.607635

设置视角代码:

    // Set up world matrix
    D3DXMATRIXA16 matWorld;
    D3DXMatrixRotationY( &matWorld, 0.0f );
    g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

    D3DXVECTOR3 vEyePt( 0.0f, 100.0f, 80.0f );
    D3DXVECTOR3 vLookatPt( -206.0f, 0.0f, 256.0f );

    D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
    D3DXMATRIXA16 matView;
    D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookatPt, &vUpVec );
    g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView );

    D3DXMATRIXA16 matProj;
    D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 100.0f );
    g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj );

yaffil

D3DXMATRIX matMove;

D3DXMatrixTranslation(matMove, -206.564331,-0.077511,256.893127);
m_pD3DDevice.SetTransform(D3DTS_WORLD, matMove);

yaffil

D3DXMatrixTranslation(matMove, +206.564331,+0.077511,-256.893127);