Since particles interpolated across periodic boundary can leak out of the boundary, we recommend to use periodic filter in such a case.
By changing base vectors, you can set boundary with triaxial anisotropy.
This filter set periodic boundary, and wrap particles outside of the boundary.
The definition of boundary is commonly used in Data Loader Dialog and Copybox Filter.
Since particles interpolated across periodic boundary can leak out of the boundary, we recommend to use periodic filter in such a case.
By changing base vectors, you can set boundary with triaxial anisotropy.