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  1. PO
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    <p>If I understood what you are trying to do, this will create a matrix which will rotate around an arbitrary axis, in your case the axis is the cross product between the direction and up vector, which is the axis pointing to your right (or left, depends on the coordinate system and product order). Cross product always return a vector perpendicular to the other two.</p> <pre><code>//Cross product D3DXVECTOR3 axis; D3DXVec3Cross(&amp;axis, &amp;direction, &amp;up); //Rotation matrix D3DXMATRIX matrix; D3DXMatrixRotationAxis(&amp;matrix, &amp;axis, rotationAmount); </code></pre> <p>The resulting matrix should be your rotation matrix.</p> <p>Have a look at <a href="http://en.wikipedia.org/wiki/Euler_angles" rel="nofollow">http://en.wikipedia.org/wiki/Euler_angles</a> in the section "rotation matrix XYZ" if you want to get the rotation angles back, but I suggest you to use built-in matrix and vector operation given by directx to store your position and rotation.</p> <p>It will allow you to easily rotate, translate and scale positions and directions using matrices withouth taking care of maths under every operation, and withouth causing gimabl lock (<a href="http://en.wikipedia.org/wiki/Gimbal_lock" rel="nofollow">http://en.wikipedia.org/wiki/Gimbal_lock</a>). Have a look at <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/bb205164(v=vs.85).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windows/desktop/bb205164(v=vs.85).aspx</a> for directx maths operations or search for other tutorials, it is really easy to learn how to handle them.</p> <p>If you want some infos on specific math or other game-related topics I suggest you to read "game engine architecture" by Jason Gregory</p>
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    1. POConverting a local rotation to a global one (matrices)
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    1. USFederico Chiaravalli
    1. USFederico Chiaravalli
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    1. POConverting a local rotation to a global one (matrices)
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    1. COHmm I see what you mean, but I can't figure out how to convert this rotation matrix back to two or three values representing rotationX, rotationY and rotationZ
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    2. COUpon Googling further, I can see that getting Yaw, Pitch, and Roll from a rotation matrix is a hell of a laborious task. Nonetheless, this is a good start. Thanks!
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    3. COOn second thoughts, your equation is returning a matrix rotation for RotationAmount, so like a delta right? If so, is there any way to modify a single axis with a full rotation matrix? Also, turning this comments section into a bomb zone. Sorry
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