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Red Planet

Player follow - Matrix question

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Hi! I have 2 world matrix in object space: Object matrix and Player matrix. All matrixes containing position (._41 - ._43) and transform data. I like to transform Object to turn toward Player, but i don''t know how i do it. I used fTurn and fUp FLOAT values to transform like: D3DXQuaternionRotationYawPitchRoll(&qR, fTurn,fUp,0); D3DXMatrixRotationQuaternion(&matR,&qR); D3DXMatrixTranslation(&matT,vVelocity.x,vVelocity.y,vVelocity.z); D3DXMatrixMultiply(&matPosition, &matR, &matPosition); D3DXMatrixMultiply(&matPosition, &matT, &matPosition); Anybody know how i compute fTurn and fUp values? Thx.

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Last night i thinking about, and i''m going this way:

v1 = (matObject._41,matObject._42,matObject._43);
v2 = (matPlayer._41,matPlayer._42,matPlayer._43);
vDif = v2 - v1;
normalize vDif, and i saw parallel with matObject vDir
vector, which i gave from matObject._31,.32,.33

vDif.x -- matObject._31
vDif.y -- matObject._32
vDif.z -- matObject._33

if vDif values approaching the vDir values the Object is turning
toward the Player. But i''m doing it manual, how can i compute?

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