The shared `arc_segments` helper now takes (radius, span, chord_tol) so
each call site can pick its own tolerance:
* Hatch fill polygon (built at load / on edit, never re-tessellated)
uses `fill_chord_tol(r) = max(0.001*r, 1µm)` — fixed high quality so
zoom-in stays sharp without rebuilding the boundary.
* Hatch wire outline (rebuilt every frame inside the render scope) uses
`wire_chord_tol(r) = min(scene_override, fill_chord_tol(r))` —
reads the per-frame `truck_tess::set_curve_tol_override` (the Scene
already sets it to `world_per_pixel × 0.5` for Phase 3.2 wires) so
far-out boundary arcs collapse to a handful of segments at low zoom
while staying at least as sharp as the underlying fill at high zoom.
Same arc_segments switch applied to the legacy 16-segments-per-circle
formula in `hatch_model_from_dxf`'s polyline-bulge tessellation, so
fill boundaries with bulged polylines also gain the proper chord-error
target.
Also expose `truck_tess::current_curve_tol` (pub(crate)) and add
`active_curve_tol()` returning Option so the new wire path can
distinguish "scene override active" from "load-time, no zoom info".
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* helpers::wcs_to_ucs — UCS inverse transform with zero call sites.
* scene::Scene::compute_and_set_world_offset — never called; the load
path uses the free function `compute_world_offset` directly.
* tessellate::tessellate_mesh — never called; mesh tessellation goes
through `solid3d_tess`, not the truck Shell/Solid path.
* truck_tess::tess_to_mesh_model — orphaned with tessellate_mesh's
removal.
* MeshModel::WHITE / MeshModel::SELECTED — only used by the removed
tessellate_mesh.
* xattach::Step::FilePath variant — never constructed; XATTACH always
enters through `with_path` after the file picker. Replaced the Step
enum + prefilled_path field with flat `path` / `block_name` fields
and dropped the unreachable text-input flow.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Edge tessellation used a fixed 0.005 world-unit chord-height tolerance
regardless of zoom — a 1000 m radius arc viewed at 50 mm/px still emitted
hundreds of segments that all collapsed onto the same screen pixel.
`truck_tess` now reads tolerance from a process-wide AtomicU64 override.
`Scene::wires_for_block` sets the override to ~0.5 px chord height
(world_per_pixel × 0.5) before the par_iter, then a Drop guard clears it
back to the default. Floor stays at the original CURVE_TOL so extreme
zoom-in keeps full quality. Block-cache rebuilds and off-render paths
(snap, hit-test) always see the default — the override is bracketed to
the render call only.
Roadmap entry for Phase 3.2 removed; Implementation Order / Key Files
tables updated.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Subtracts the DXF header extents centroid (world_offset) from all coordinates
in f64 BEFORE casting to f32. This eliminates the ~0.5 m ULP error that occurs
at 4,000,000 m UTM coordinates and caused geometry to disappear on zoom-out.
- Scene: adds world_offset field + compute_and_set_world_offset() method
- tessellate.rs: threads world_offset through all f64→f32 conversions
(legacy_geometry, dimension_geometry, solid_wire_fallback, multileader)
- truck_tess.rs: to_local() helper already in place from prior session
- mod.rs: tessellate_entity() and entity_aabb() apply world_offset
- update.rs: compute_and_set_world_offset() called after doc load
- cmd_result.rs / solid3d_cmds.rs: pass correct offset to truck tessellators
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
