[eigen] Constructing a matrix by scalar* |

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Hi

`I'm currently working with vtk and it has a pretty ugly way of dealing
``with vectors /- /at least in my opinion. So I thought I could use eigen2
``to do some of the fixed-size vector-math I'm doing. I found that Matrix
``has a data() function which returns a raw pointer to the data so that's
``good. But What I'm missing is a constructor which constructs a i.e.
``vector3f from a float pointer without copying the data. If I want to
``efficiently interact between vtk and eigen, I think this is very crucial.
`
Is this somehow possibel?
Thanks
Benjamin
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