- Selected vias and through-hole pads inject at the drill-wall ring on
every spanned layer (both contact models), not the whole pad face,
so the pad/pour spreading resistance is part of the result. Vias are
now selectable as contacts.
- Soldered THT joints: the hole is modeled solder-filled (core in
parallel with the plating, also for stitching THT barrels) and the
pad face carries an average-thickness solder coat over the modeled
copper (SOLDER_THICKNESS_UM).
- Vias with drills above a configurable threshold (dialog field,
default CAP_MAX_DRILL_MM = 0.5) keep open mouths even with capping
selected - the fab caps only small vias.
- Geometry dump schema v6: electrode barrel fields, cap_max_drill_nm.
- Verified against R = rho/(pi t)*acosh(d/2a) for two circular contacts
on a sheet (+2.6% at h = 0.15 mm, a = 1 mm; uniform model above the
equipotential one as required by the contact bracket).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Each via now contributes its ring/pad copper (full-thickness disc of
the pad diameter on every spanned layer) and its drill mouth: with
"vias filled + capped" (dialog checkbox, default on, VIAS_CAPPED) the
mouth carries a CAP_PLATING_UM (15 um) thin copper cap on the outer
layers and is an open hole on inner layers; unchecked, mouths are open
everywhere. Mouth coverage is area-weighted per cell (4x4
supersampling) through a per-cell thickness map feeding the existing
harmonic-mean face machinery, so sub-cell mouths perturb the sheet by
their true covered fraction instead of whole cells. Fully swallowed
cells leave the mask; the barrel then attaches through the ring via the
existing pad-footprint search. THT-pad copper and drills stay outside
the model. Ring discs paint before 1D trace chains (chains see them as
regular copper), mouths after wide tracks (drills go through trace
copper). standalone gains --uncapped.
Tests: cap==foil identity against the feature-off reference, strict
R(solid) < R(cap) < R(hole) ordering, ring bridging a fill gap that a
ringless barrel cannot cross, gentle sub-cell perturbation at coarse
grids, and JSON roundtrip of the new fields.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
janik