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c++matheigen

Eigen convert Matrix4x4 to Matrix3x3

I cannot get my head around this problem to convert Matrix4x4 to Matrix3x3 using Eigen. For example if I try this it fails:

Matrix4f m;
m << 1, 2, 3, 4,
     5, 6, 7, 8,
     9, 10, 11, 12,
     13, 14, 15, 16;
Matrix3f m2 = m.block(0,0,3,3);

Is it possible to return different type with block operations or if there is any other quick workaround for this problem?

Solution

  • Upgrading to Eigen 3.2.1 fixed my problem.