Congratulations to Luke, Rubens, and Stephen on their publication of "Spatial gradient interface detection in topology optimization for an unstructured mesh".
A technique for spatial gradient calculation is developed, using a neighbouring element search strategy. Their method works for 3D unstructured meshes, a versatile approach for FE solvers. Congratulations on your work!
Link: https://doi.org/10.1007/s00158-020-02688-z