Is there a simple way to map a Eigen::Matrix4d content to a Qt QMatrix4x4?
Since I'm using a QGlShaderProgram that takes a QMatrix4x4 as uniform for the GLSL mat4 type, I have to copy the content of my Eigen matrices to Qt QMatrix4x4 with a double nested for loop.

I don't want to write the loop everytime, nor I don't want to write a conversion function, I think that since I already have the data, they should be mapped simply.

Code: Select all

    Eigen::Matrix4d eMVP = Projection*ModelView;

    QMatrix4x4 MVP;
    for (int i=0; i<4;i++)
    {
        for (int j=0; j<4; j++)
            MVP(i,j)=eMVP(i,j);
    }


That's more a Qt question, but you can simply do QMatrix4x4(eMVP.data()).

I do something like this

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QMatrix4x4 eigenToQt( const mtk::RigidTransform3D& transform )
{
  return QMatrix4x4(transform.cast<qreal>().data()).transposed();
}


Something similar should work with regular matrices as well.

Regards,
Hauke