Snap on Z-axis in perspective
e.g.: You are in perspective and snap on the default grid: You can't snap in Z-axis then.
The "snap on grid" works always on the two axis and not on the third.
Yes and No. The grid display as a 2D plane. But it works in top, left, front e.g. So it's a kind of 3D. It should be something like 3D grid in perspective: Add or change the grid to z axis if the user use the z axis of the gizmo.
Just like in many other 3D programs.
AdminMartin B (Admin, Autodesk) commented
Not sure I understand. Snap on grid is by definition two-dimensional, in the plane of the grid. How would you snap in the third dimension then?