DitectX 90 3D 基本变换函数

基本变换

平移矩阵(translation matrix）

用于创建平移矩阵的D3DX函数

D3DXMATIX *D3DXMatrixTranslation (

   D3DXMATRIX * pOut,     //result 

   FLOAT x,    //Number of units to translate  on x-axis 

   FLOAT y,    //Number of units to translate  on y-axis 

   FLOAT z    //Number of units to translate  on z-axis 

)

旋转矩阵（rotation matrix）

D3DXMATRIX *D3DXMatrixRotationX(

  D3DXMATRIX *pOut,     //result 

  FLOAT  Angle           //Angle of rotation measured in radians

};

比例变换矩阵 （Scaling Matrix）

D3DXMATRIX *D3DXMatrixScaling (

   D3DXMATRIX * pOut ,   // result.

   FLOAT sx,    //Number of units to translate  on x-axis 

   FLOAT sy,    //Number of units to translate  on y-axis 

   FLOAT sz    //Number of units to translate  on z-axis 

);

 向量变换的函数

D3DXVec3TransformCoord 函数对点进行变换， 并假定向量的第个分量为1。

D3DXVECTOR * D3DVXec3TransformCoord (

   D3DXVECTOR3 * pOut,      //result 

   CONST D3DXVECTOR3* pv,  // The point to transform 

   CONT D3DXMATRIX * pM    //The transformation matrix 

);

D3DXMATRIX T(…);            //initialize a transformation matrix

D3DXVECTOR p(…);            //initialize a point

D3DXVec3TransformCoord (&p, &p, &T);  //transform the point 

D3DXVec3TransformNormal用于向量的变换， 并假定微量的第4个分量为0

D3DXVECTOR3 * D3DXVec3TransformNormal(

   D3DXVECTOR3 *pOut,   // result.

   CONST D3DXVECTOR3* pv,  // The vector to transform 

   CONT D3DXMATRIX * pM    //The transformation matrix 

);

 

D3DXMATRIX T(…);            //initialize a transformation matrix

D3DXVECTOR v(…);            //initialize a vector

D3DXVec3TransformCoord (&v, &v, &T);  //transform the point 

 

用于点数组的函数

D3DXVECTOR3 *WINAPI D3DXVec3TransformCoordArray(      

    D3DXVECTOR3* pOut,

    UINT OutStride,

    CONST D3DXVECTOR3* pV,

    UINT VStride,

    CONST D3DXMATRIX* pM,

    UINT n

);

 pOut

[in, out] Pointer to the D3DXVECTOR3 structure that is the result of the operation.

OutStride

[in] Stride between vectors in the output data stream.

pV

[in] Pointer to the source D3DXVECTOR3 array.

VStride

[in] Stride between vectors in the input data stream.

pM

[in] Pointer to the source D3DXMATRIX structure.

n

[in] Number of elements in the array.

用于向量的数组的变换：

D3DXVECTOR3 *WINAPI D3DXVec3TransformNormalArray(      
    D3DXVECTOR3* pOut,

    UINT OutStride,

    CONST D3DXVECTOR3* pV,

    UINT VStride,

    CONST D3DXMATRIX* pM,

    UINT n

);

 pOut

[in, out] Pointer to the D3DXVECTOR3 array that is the result of the operation.

OutStride

[in] Stride between vectors in the output data stream.

pV

[in] Pointer to the source D3DXVECTOR3 array.

VStride

[in] Stride between vectors in the input data stream.

pM

[in] Pointer to the source D3DXMATRIX structure. To transpose a normal with a non-affine matrix, this matrix should be a transposed-inverse transformation matrix.

n

[in] Number of elements in the array.

查看DirectX9.0 3D SDK

《DirectX 9.0 3D游戏开发编程基础》 笔记

江西理工大学 FangSH 2010-4-17 整理