矩陣旋轉到四元數

我正在做一個演示，以將矩陣（3x3）轉換爲四元數，但是我卡住的東西對大多數來說似乎很簡單，但我的大腦正在關閉，因爲我已經一直在這工作幾個小時。下面的代碼使用C++和openGL在我選擇的IDE（VS2010 Express）中編譯好，但我收到以下錯誤 - 「變量'm11'正在使用而未被初始化。」這個錯誤出現在我的矩陣中的所有浮點變量，所以當我嘗試運行代碼時，它只是炸彈出來。誰能幫忙？謝謝矩陣旋轉到四元數

代碼：

void matrixIntoQuaternions() { 

      // Input matrix 3X3 
      float m11,m12,m13; 
      float m21,m22,m23; 
      float m31,m32,m33; 

      // Output quaternion 
      float w,x,y,z; 
      // Determine which of w,x,y, or z has the largest absolute value 
      float fourWSquaredMinus1 = m11 + m22 + m33; 
      float fourXSquaredMinus1 = m11 - m22 - m33; 
      float fourYSquaredMinus1 = m22 - m11 - m33; 
      float fourZSquaredMinus1 = m33 - m11 - m22; 

      int biggestIndex = 0; 
      float fourBiggestSquaredMinus1 = fourWSquaredMinus1; 

      if(fourXSquaredMinus1 > fourBiggestSquaredMinus1) { 
       fourBiggestSquaredMinus1 = fourXSquaredMinus1; 
       biggestIndex = 1; 
      } 
      if (fourYSquaredMinus1 > fourBiggestSquaredMinus1) { 
       fourBiggestSquaredMinus1 = fourYSquaredMinus1; 
       biggestIndex = 2; 
      } 
      if (fourZSquaredMinus1 > fourBiggestSquaredMinus1) { 
       fourBiggestSquaredMinus1 = fourZSquaredMinus1; 
       biggestIndex = 3; 
      } 
      // Per form square root and division 
      float biggestVal = sqrt (fourBiggestSquaredMinus1 + 1.0f) * 0.5f; 
      float mult = 0.25f/biggestVal; 

      // Apply table to compute quaternion values 
      switch (biggestIndex) { 
       case 0: 
        w = biggestVal; 
        x = (m23 - m32) * mult; 
        y = (m31 - m13) * mult; 
        z = (m12 - m21) * mult; 
        break; 
       case 1: 
        x = biggestVal; 
        w = (m23 - m32) * mult; 
        y = (m12 + m21) * mult; 
        z = (m31 + m13) * mult; 
        break; 
       case 2: 
        y = biggestVal; 
        w = (m31 - m13) * mult; 
        x = (m12 + m21) * mult; 
        z = (m23 + m32) * mult; 
        break; 
       case 3: 
        z = biggestVal; 
        w = (m12 - m21) * mult; 
        x = (m31 + m13) * mult; 
        y = (m23 + m32) * mult; 
        break; 

        quatX = x; 
        quatY = y; 
        quatZ = z; 
        quatW = w; 

        model = vec4(quatX,quatY,quatZ,quatW); 
       } 
      }

來源

2014-01-30 user1283674

好吧，你在哪裏初始化M11？ –

你的輸入矩陣應該來自哪裏？ –

這些值可以是隨機的，這並不重要。我不確定矩陣中應該有什麼值。 – user1283674

讓您的輸入輸入你的函數和點不留他們不確定：

void matrixIntoQuaternions(
      float m11, float m12, float m13, // Make these function parameters! 
      float m21, float m22, float m23, 
      float m31, float m32, float m33 
) 
{ 
    // Rest of your code... 
}

來源

2014-01-30 11:44:32 ltjax

矩陣旋轉到四元數

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