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3d Laser Scanning .org: Forums

www.3dlaserscanning.org :: View topic - Question about PTX file format
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Question about PTX file format

 
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daviddoria
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Joined: Sep 01, 2009
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PostPosted: Wed Sep 02, 2009 12:13 am    Post subject: Question about PTX file format Reply with quote
I saw that lines 4 - 10 in a ptx file are a 3x3 rotation matrix and a 4x4 rotation matrix. Why is it necessary to store the same matrix twice, but with an extra column of (0, 0, 0, 1) in the 4x4 case?

Thanks,

David
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