<div>
You can go back to a rotation matrix from a quaternion<br />
<br />
D3DXMatrixRotationQuaterni<wbr />on<br />
<br />
You can also try this<br />
<br />
D3DXQuaternionToAxisAngle<br />
<br />
Hope this helps
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You can go back to a rotation matrix from a quaternion

D3DXMatrixRotationQuaternion

You can also try this

D3DXQuaternionToAxisAngle

Hope this helps

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Maybe I wasn't clear...<br />
<br />
I have the rotation matrix, what I'm looking for is the LookAt vector i.e. the vector in the same direction as my object's 'heading'<br />
<br />
D3DXLookAtLH takes 3 vectors lookAt, eye and up and builds a rotation matrix from them. Is There a way to do the opposite?<br />
<br />
Cheers,<br />
Krip<br />
<br />

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Maybe I wasn't clear...

I have the rotation matrix, what I'm looking for is the LookAt vector i.e. the vector in the same direction as my object's 'heading'

D3DXLookAtLH takes 3 vectors lookAt, eye and up and builds a rotation matrix from them. Is There a way to do the opposite?

Cheers,
Krip



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<div class="content wysiwyg-content">
How do I figure out the 'heading' vector given a certain quaternion representing the object's orientation.<br />
<br />
Using directX I can get the rotation matrix. is there a way to do the invesre of the D3DXMatrixLookAt for the 3 vectors (or 1 of them for that matter)?<br />
<br />
Cheers,<br />
Krip
</div>
</div>


How do I figure out the 'heading' vector given a certain quaternion representing the object's orientation.

Using directX I can get the rotation matrix. is there a way to do the invesre of the D3DXMatrixLookAt for the 3 vectors (or 1 of them for that matter)?

Cheers,
Krip

Another quaternion question

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