Inverse of transformation matrix For the following 3D transfromation matrix M, find its inverse. No

watch5826c

watch5826c

Answered question

2022-06-20

Inverse of transformation matrix
For the following 3D transfromation matrix M, find its inverse. Note that M is a composite matrix built from fundamental geometric affine transformations only. Show the initial transformation sequence of M, invert it, and write down the final inverted matrix of M.
M = ( 0 0 1 5 0 3 0 3 1 0 0 2 0 0 0 1 )

Answer & Explanation

nuvolor8

nuvolor8

Beginner2022-06-21Added 32 answers

Here 4 × 4 matrix M represents an affine transformation in 3D. It does so by conveniently combining a 3 × 3 matrix P and a translation v in a way that allows the affine transformation P u + v to be computed by a single matrix multiplication:
M ( u 1 ) = ( P u + v 1 )
where M = ( P v 0 1 )
It follows that "undoing" the affine transformation can be accomplished by multiplying by M 1 :
M 1 = ( P 1 P 1 v 0 1 )
Given that M = ( 0 0 1 5 0 3 0 3 1 0 0 2 0 0 0 1 ) , one computes by any of a variety of ways:
M 1 = ( 0 0 1 2 0 1 / 3 0 1 1 0 0 5 0 0 0 1 )

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