Getting a matrix basis with DirectXMath

Started by mrheisenberg, Dec 25 2012 04:40 PM

math xnamath

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#1 mrheisenberg Members - Reputation: 332

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Posted 25 December 2012 - 04:40 PM

Not exactly sure if this is for Math&Physics or DirectX...
Is there any way to get the X Y and Z basis from a XMMATRIX with DirectXMath/XNAMath ( http://asawicki.info/Download/Misc/XNA_Math_Cheatsheet/XNA_Math_Cheatsheet_1-1.pdf ) or must it be done by hand from a XMFLOAT4X4?None of these functions seems to do that.

Edited by mrheisenberg, 25 December 2012 - 04:40 PM.

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#2 MJP Moderators - Reputation: 5463

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Posted 25 December 2012 - 09:44 PM

The X, Y, and Z basis vectors for a row-major matrix are just the first, second, and third rows of the matrix respectively. XMMATRIX is defined as an array of 4 XMVECTOR's, so you can just index into that array to get a row as an XMVECTOR.

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