Camera Track | GameDev.net

jeppa · 2001-11-13T11:58:30+00:00

how I can track an object in motion ?? Thanks in Advance

if you are using direct 3d, use the D3DXMatrixLookAtLH function to generate a view matrix that pints at the coordinates of the moving object ear frame. If not, here is the documentation for the function so you can make your own (note this is left handed):

  
D3DXMATRIX* D3DXMatrixLookAtLH(
  D3DXMATRIX* pOut,
  CONST D3DXVECTOR3* pEye,
  CONST D3DXVECTOR3* pAt,
  CONST D3DXVECTOR3* pUp
); 

zaxis = normal(At - Eye)
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

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