The Perspective Grid tool's left and right ground-level points move the whole
grid; the left and right extents are separate (extentRight; Alt drags both,
Shift goes by whole cells); a cell size widget sits up the line where the planes
meet; Shift keeps a vanishing point on the horizon and the ground points and
origin on one axis. The Plane Switching Widget stays put in a corner of the
document window (ViewInfo/ToolContext carry the window as a ScreenFrame), takes
its clicks with any tool while the grid shows (the Perspective Selection tool
too while it's hidden), and 1-4 pick the left, horizontal, right and no plane.
Double-clicking the Perspective Grid tool opens Perspective Grid Options
(show the widget, its corner; perspective.widget.options, kept with the
preferences).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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