GeoGen Script reference

An invalid transformation matrix was passed to HeightMap.Transform.
The transformation matrix must be invertible. An invertible matrix always has nonzero determinant, which can be calculated using following formula:
determinant = a11 * a22  a12 * a21
Noninvertible (singular) matrices usually have their rows/columns related in an unnatural way (for example two rows/columns are the same or a multiple of each other) or have a row/column composed exclusively from zeroes.