雷採摘方向不正確計算

我有以下功能代碼：雷採摘方向不正確計算

D3DXVECTOR3 Mouse::GetClickDirection(D3DXMATRIX projMatrix, D3DXMATRIX viewMatrix, D3DXVECTOR3 cameraPosition) 
{ 
    POINT mousePoint; 
    GetCursorPos(&mousePoint); 

    ScreenToClient(hwnd, &mousePoint); 

    float x = ((mousePoint.x * 2.0f)/(float)backBufferWidth) - 1.0f; 
    float y = ((mousePoint.y * -2.0f)/(float)backBufferHeight) + 1.0f; 

    D3DXVECTOR3 mouseClip = D3DXVECTOR3(x, y, 1.0f); 

    D3DXMATRIX invViewMatrix; 
    D3DXMatrixInverse(&invViewMatrix, 0, &viewMatrix); 

    D3DXMATRIX invProjMatrix; 
    D3DXMatrixInverse(&invProjMatrix, 0, &projMatrix); 

    D3DXMATRIX inversedMatrix = invViewMatrix * invProjMatrix; 

    D3DXVECTOR3 mouseWorldSpace; 
    D3DXVec3TransformCoord(&mouseWorldSpace, &mouseClip, &inversedMatrix); 

    D3DXVECTOR3 direction = mouseWorldSpace - cameraPosition; 

    D3DXVec3Normalize(&direction, &direction); 

    system("CLS"); 
    std::cout << "sX: " << x << std::endl; 
    std::cout << "sY: " << y << std::endl; 

    std::cout << "X: " << direction.x << std::endl; 
    std::cout << "Y: " << direction.y << std::endl; 
    std::cout << "Z: " << direction.z << std::endl; 

    return direction; 
}

我試圖根據x和y的屏幕一點上，用戶點擊了在計算和創建一個定向光線我DirectX 3D應用程序。到目前爲止，印刷的結果似乎表明我的計算是錯誤的，因爲Z值總是在0.9左右，我不知道爲什麼。我在這裏做錯了什麼？請幫忙。謝謝

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2013-10-29 Danny

你知道，還有就是[D3DXVec3Unproject功能（http://msdn.microsoft.com/en-us/library/windows/desktop/bb205526（V = vs.85）的.aspx），做基本上這個？ –

我認爲你的逆矩陣計算是倒退。

D3DXMATRIX inversedMatrix = invProjMatrix * invViewMatrix;

來源

2013-10-29 19:27:11 MooseBoys

雷採摘方向不正確計算

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