位置控制

//平移
D3DXMATRIX W;
D3DXMatrixTranslation(&W,
        TeapotPosition.x,                        
        TeapotPosition.y,
        TeapotPosition.z);
Device->SetTransform(D3DTS_WORLD, &W);

//设置照相机的位置和方向
D3DXVECTOR3 pos(0.0f, 0.0f, -3.0f);
D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &pos, &target, &up);

Device->SetTransform(D3DTS_VIEW, &V);

//照相机漫游
static float radius = 20.0f; 

if( ::GetAsyncKeyState(VK_UP) & 0x8000f )
    radius -= 2.0f * timeDelta;

if( ::GetAsyncKeyState(VK_DOWN) & 0x8000f )
    radius += 2.0f * timeDelta;

static float angle = (3.0f * D3DX_PI) / 2.0f;

if( ::GetAsyncKeyState('A') & 0x8000f )
    angle -= 0.5f * timeDelta;

if( ::GetAsyncKeyState('S') & 0x8000f )
    angle += 0.5f * timeDelta;

D3DXVECTOR3 position( cosf(angle) * radius, 3.0f, sinf(angle) * radius );
D3DXVECTOR3 target(0.0f, 0.0f, 0.0f);
D3DXVECTOR3 up(0.0f, 1.0f, 0.0f);
D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &position, &target, &up);
Device->SetTransform(D3DTS_VIEW, &V);