Paper-space hit testing only sees sheet entities, so DIMLINEAR / DIMALIGNED /
DIMRADIUS / DIMDIAMETER / DIMANGULAR in "select object" mode found nothing
when the user clicked the model geometry a viewport displays.
A pick that lands inside a content viewport is now mapped into model space
through the viewport frame and tested against that viewport's resident model
wires - the same tessellation it draws, so the pick matches what the user
sees. Ordinary block instances are descended into, with the instance
transform (recursively, up to eight levels) baked into the extracted
geometry, so a line inside a block measures its placed length.
The picked entity is handed to the command already projected onto the sheet,
so all five commands keep working entirely in paper coordinates and unchanged;
the pick is recorded as a viewport snap, so the committed dimension is
compensated exactly like a point-input one. A miss falls through to the
ordinary paper-space pick.
Also narrows mixed-space classification to the measuring points: the final
click of each of these commands is the dimension-line placement, which lands
on bare sheet for viewport measurements and inside a viewport rectangle for
paper ones, and says nothing about what is being measured.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
DIMLINEAR / DIMALIGNED / DIMRADIUS / DIMDIAMETER / DIMANGULAR created on a
sheet now report the model measurement of the geometry seen through a
viewport, at any viewport scale, while definition points, the dimension line
and the text stay in paper coordinates and the annotation keeps its sheet
size (DIMSCALE is untouched).
A viewport frame is a similarity - uniform scale plus in-plane twist - so
projecting the model span onto the paper axis and compensating gives exactly
the raw paper measurement times 1/scale. No geometry is rewritten: the
compensation is persisted once as a negative DIMLFAC override on the
dimension and applied once by the linear formatter, so preview text,
dimension text, the properties measurement row and DXF/DWG export all agree.
User measurement multipliers fold into the same magnitude, and an explicit
text override still bypasses formatting entirely, so it is never re-scaled.
Angular dimensions are never compensated - a similarity preserves angles.
Mixed input (one point through viewport A, another through viewport B or on
the sheet) is refused rather than silently mis-measured: the command line
explains why and the dimension falls back to plain paper measurement.
A dimension measured through a viewport is left unassociated: its definition
points are projected paper coordinates, so inferring a paper-space
association would bind it to geometry that is not there. PR3 records the real
dimension -> viewport -> entity chain.
The result is one ordinary dimension entity carrying one style override, so
undo/redo works through the existing history with no new out-of-document
state.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
