D3DXMAMATRIXLOKATRH function
Create a right hand coordinate system observation matrix.
definition:
D3DXMAMATRIX * WINAPI D3DXMATRIXLOOKATRH (
D3DXMAMATRIX * POUT,
Const d3dxvector3 * peye,
Const D3DxVector3 * Pat,
Const D3DxVector3 * Pup
);
parameter:
pout
[IN, OUT] points to the matrix of returning results of the D3DXMatrix structure.
peye
[in] Point all the eyes of the D3DxVector3 structure all in position vectors. This value will be used to translate.
PAT
[in] Points the camera to observe the target position vector to the camera of the D3DxVector3 structure.
PUP
[in] Points to the current world coordinate system of D3DXVECTOR3 structure. Usually used in [0, 1, 0].
return value:
Point to the left hand coordinate system observation matrix of the D3DXMAMATRIX structure.
Description:
The return value is the same as the parameter Pout returned. By this way, the D3DxMatrixLookaTRH function can be a parameter of other functions.
This function calculates the returned matrix with the following formula:
ZAXIS = NORMAL (Eye - AT)
XAXIS = Normal (Cross (Up, ZAXIS))
Yaxis = Cross (ZAXIS, XAXIS)
Xaxis.x yaxis.x zaxis.x 0
Xaxis.y yaxis.y zaxis.y 0
Xaxis.z yaxis.z zaxis.z 0
-dot (Xaxis, Eye) -dot (Yaxis, Eye) -dot (ZAXIS, EYE) 1
Function information:
HEADER
D3DX9Math.h
Import Library
D3DX9.LIB
Minimum operation systems
WINDOWS 98
related functions:
D3DXMAMATRIXLOKATLH
