directx9学習(カメラの回転修正)

カメラを回転させるとupベクトルとカメラの向きが近いとき
画面がぱちぱち切り替わる現象が発生した。
モデルを回転させる方式に戻した

VOID SetupMatrices()
{
　　// Set up world matrix
　　D3DXMATRIXA16 matWorld, matScl;
　　D3DXMATRIXA16 mattmp1, mattmp2;
　　D3DXMatrixTranslation(&mattmp1, -cx, -cy, -cz);
　　D3DXMatrixTranslation(&mattmp2, cx, cy, cz);
//　　D3DXMatrixIdentity(&matWorld);
　　matWorld = mattmp1 * matRot * mattmp2;
　　g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

　　// Set up our view matrix. A view matrix can be defined given an eye point,
　　// a point to lookat, and a direction for which way is up. Here, we set the
　　// eye five units back along the z-axis and up three units, look at the
　　// origin, and define "up" to be in the y-direction.
　　D3DXVECTOR3 vEyePt( cx, cy, cz+clen );
　　D3DXVECTOR3 vLookatPt( cx, cy, cz );
//　　vEyePt -= vLookatPt;
//　　D3DXVec3TransformCoord(&vEyePt, &vEyePt, &matRot);
//　　vEyePt += vLookatPt;
　　D3DXVECTOR3 vUpVec( 0.0f, 1.0f, 0.0f );
　　D3DXMATRIXA16 matView;
　　D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookatPt, &vUpVec );
　　g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView );