Hi Jeff, There is a button on the Per-Model Clipping dialog that lets you align the plane perpendicular to the screen. There is no other capability for aligning the plane perpendicular to an axis. I sometimes use this button in combination with keyboard shortcuts so (standard orientation), and x9, y9, z9 (rotate about x, y, or z axis by 90 degrees). You turn on keyboard shortcuts using menu entry Tools / General Controls / Accelerators On. I have them turned on by default using the Preferences dialog. With these shortcuts the clip plane can be oriented perpendicular to various axes although it is a bit complicated. Is part of your question that you also want to adjust the position where the plane intersects a given axis -- for example, a slider to move the plane keeping its orientation fixed, and report its position along the axis? It is easy to add all those controls although it would greatly expand the per-model clipping dialog. We would need some user interface that hides some of that complexity for users who do not need it. Tom