Matrix4d.set3x3

Set the upper left 3x3 submatrix of this {@link Matrix4d} to the given {@link Matrix3d} and don't change the other elements.

@param mat the 3x3 matrix @return this

  1. Matrix4d set3x3(Matrix4d mat)
  2. Matrix4d set3x3(Matrix3d mat)
    struct Matrix4d
    ref public return
    set3x3

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