Zbrush lowpoly modeling and polygroups.
If you ever wondered why during polymodeling in zbrush you keep selecting several polygroups by CTRL+Shift clicking on only one:
Zbrush for most of brushes and selections uses vertices. And if your polygon doesn’t have any other polygon in same polygroup next to vertex that you clicked – it just selects also next polygoup.
![](https://photoindra.com/pictures/zbrush_polygroup_isolation_problem_2022_06_12_06_26_38.gif)
So in this case you can use Select Lasso tool and click on one edge to hide full polygon loop. And then invert the visibility by CTRL+Shift dragging outside of mesh:
![](https://photoindra.com/pictures/zbrush_polygroup_isolation_solution_2022_06_12.gif)