A face's boundary node on a patch side collapsed to within the tolerance of
the vertex there (capped at the chord tolerance), not to a point, is a pole:
its parameter along the collapsed direction is free, as the record check and
the STEP loop check take it (`uv::collapsed`, shared with
`SurfaceEval::pole_within`). A loop through such a corner no longer winds
round the surface as projected, and plans strictly (Poppy Humanoid's
connector, face 43: a quarter of a sphere cap on a closed rational spline).
A face the strict plan and the lenient fill both refuse no longer fails the
whole body's mesh: it is left out with no triangles, named in
PlanStats::unmeshed (logged by the display plan, counted by
Body::unmeshed_faces), and the rest of the body is meshed; a body none of
whose faces plan is still the first face's error. Body::volume_at gives no
volume for a mesh with a face left out.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An edge raised to cover its pcurves' gap could get past SMLib's limit
(Congé19: 0.98 mm off, tolerance 1.47 mm) and its whole solid then failed
as "SMLib rejected the input". The tolerance an edge or vertex would get,
not only its gap, is now held to that 1 mm: farther off is refused with
how far. The record mapping refuses a tolerance past it with a message
rather than handing SMLib what it rejects.
The margin over a surface gap moves to solidcraft_geom::brep::pcurve
(SURFACE_GAP_MARGIN) for SMLib's pcurves to use too.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
EvalSurface and SurfaceEval give every partial derivative up to total order four: in closed
form on cylinders, cones, spheres and tori, by basis-function derivatives and Leibniz's rule on
rational splines, and by the rotation's own derivatives on a revolution (which had no second
derivatives before). normal_section turns them into the curvature of a normal section and its
first two arc-length derivatives by solving the section's Taylor series order by order.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LUXeKMoxpM7Vuv8Rb6E3K2
A corner ball's edge may run from its equator over the sphere's pole to a vertex just past
it (Poppy Humanoid's creative_commons_license: 1.8° past, 0.016 mm off the pole). On the
sphere's parameters the pole is a line, and the edge's pcurve would have to jump half a turn
along it: "pcurve starts 2 from the end of the use before it, on another period". Each
edge that passes through a pole of a face it bounds (a sphere's, a revolved face's on its
axis) inside its interval is now split at the nearest point to the pole (golden-section
search from 16 samples), the new vertex placed on the pole; the loop's half turn is then at
a vertex on the pole, where a loop may run along it. Each solid's notes say how many edges
were split. The geometry check takes a vertex at a pole to within the vertex's tolerance, as
the reader already does (SurfaceEval::pole_within).
Without the split the edge's jump read as a 0.024 mm gap and was covered by a tolerance:
the measured gap now only covers what the file's geometry really has.
Test: a spherical triangle (radius 0.5) with an edge over the pole to 1.8° past it reads
with its spherical-excess area and its edge split.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LUXeKMoxpM7Vuv8Rb6E3K2
A range sampled in even steps ends at a + (b − a)·1, which may round one ulp past b, where
find_span gave no span and every B-spline evaluation there failed. The import's loop area
(the reader's sampling of each pcurve, used to turn over a face whose outer loop runs
clockwise) then had no value, the face was left as written, and the record check refused
it: "outer loop runs clockwise in (u, v)" on 7 of Poppy Humanoid's solids. The same step
had refused closed-form pcurves (426924937). find_span now takes a parameter within 8 ulps of
the domain's magnitude past an end as that end; farther is outside, as before. It fixes the
pattern for every caller rather than each sampling loop.
Poppy: 232 → 242 bodies, 15 → 7 solids not imported; the kernel tests as before.
Test: Poppy's interval's last step rounds past its end and finds the end's span; 1e-9
past is still outside.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LUXeKMoxpM7Vuv8Rb6E3K2
The closed-form pcurve's lift check sampled t0 + (t1 − t0)·k/n, which at k = n can round
one step past t1 (1.2985843833752289 for an end of 1.2985843833752286), where the pcurve
on [t0, t1] has no point: the closed form was refused, and on a plane, which has no
parameter box for a kernel's pcurves, the face with it ("a face on an unbounded surface
without closed-form pcurves", Poppy Humanoid's Combine1 and others). The end is now t1.
Test: Poppy's interval on a spline on a plane; without the fix, "no exact pcurve of a
B-spline on a plane".
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LUXeKMoxpM7Vuv8Rb6E3K2
Brep::validate lets a pcurve's interval differ from its edge's by PCURVE_INTERVAL (1e-9
of the magnitude: rounding room), but check_geometry then evaluated the pcurve at the
edge's own ends and samples, which may lie just past it: "the pcurve has no point at
2.0000000000082903" on four of Poppy Humanoid's solids, circle edges whose end vertex
sits on a quarter of their form, where SMLib's pcurve ends on the knot. Both of the
check's pcurve readings (the use's points and the loop's area) now take the edge
parameter on the pcurve's interval, through one reader.
Poppy: 195 → 199 bodies, 41 → 37 solids not imported; the corpus survey and the kernel
tests are as before.
Test: a pcurve whose interval ends 1e-11 short of its edge's validates and checks;
without the clamp, "the pcurve has no point at 1".
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LUXeKMoxpM7Vuv8Rb6E3K2
The pcurves close a face's loop through a pole to within the face's tolerance (a
point where crossing half a period moves less than that): there the periodic parameter
is free and the loop jumps across. The reader's check that no loop crosses a seam
without a seam edge took a pole only exactly (1e-9 relative), so it refused the loops
the pcurves had closed near one. Poppy Humanoid's nearly round pin ends (a spindle
torus of major radius 0.005, minor 0.345) have their apex vertex at the tube's top,
3.6e-5 mm above the true pole: their meridians end 1.7e-6 rad short of it, and 13
faces were refused. Both now use one test, SurfaceEval::pole_within.
Test: a point 2e-7 mm from a sphere's axis is a pole within 1e-6 mm, not within 1e-7.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LUXeKMoxpM7Vuv8Rb6E3K2
fill_loop's bicubic height field over the loop's plane, fitted to the
neighbours' derivatives as well as the loop: every condition of a graph is
linear in its heights (G1: the gradient from the face's normal; G2: the second
derivative along the face's leave direction from its normal curvature), so
one banded least-squares solve with the thin-plate energy decides the surface.
Its parameters stay plane coordinates, so an edge's pcurve is still the edge
projected onto the plane, exactly.
Where a round's section meets a plane at a corner of the loop, the section has
the round's curvature and the plane is flat across its own curve: no surface
is G2 to both there. The G2 rows fade in over 15% of the run from each corner;
asked over a few cells instead, the plane's flatness to the second order along
its curve pulls the surface off the whole side. Grids go to 128 spans, which
G2 to a plane along a curved line needs. The thin-plate weight is a thousand
times fill_loop's: with the slope and curvature rows acting a little inside
the loop, the weaker one let the surface rise past a plane it is G2 to (0.06
mm at a box corner of r5 rounds set back 8).
loop_frame is fit_once's plane, shared.
Tests: the hole a setback leaves at a box corner of r5 rounds set back 8,
within 2.2e-5 of the loop, 0.027 degrees and 4.7e-4 per mm of its neighbours
clear of the corners; set back 7.5 to 15, under its planes but by under 7.2e-4;
a hole in a cylinder filled with the cylinder's own second order; refusals.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An edge is left out of the shaded view only where its two faces meet
with one tangent plane (normals within 0.5 degrees) and one curvature
across the edge: at each station the faces' normal curvatures square to
the edge agree within 0.5 degrees' worth, |k1 - k2| <= 0.0087 x
max(|k|, 1/L), L the edge's length, so the continued faces turn apart
by no more than that over a radius of curvature or the edge's length.
Fillet boundaries (0 to 1/r), corner-patch joins and a plane tangent to
a cylinder are drawn again, straight ones included. A modelled thread's
flank pieces (one sweep) differ by at most 0.0046 and stay hidden.
Second derivatives of a spline surface now exist at a boundary point a
pcurve carries a rounding step past the knot range, as its point and
first derivatives already did.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The branch rebased onto main keeps each of its commits; where both sides
changed the same code, these are the pieces neither side's commit had.
- Cargo: one [features] table in the CLI's manifest (two met in the merge).
- geom: a NURBS surface's `closed` set once in a placed copy (both sides
added it).
- kernel: the whole-face extrude tools (#2040) work around truck's boolean
on truck types, which left the workspace with the SMLib kernel; the
module, its tests and the doc crate's tool and tests go. The display
planner's flat fill (tess/fallback.rs) has no caller with the schema 4
mesher, and the tessellator's seam and uv modules are the branch's. A
body's boundary tolerance from a STEP file belongs to the truck body the
schema 4 record replaced: `with_boundary_tol` goes. `unmeshed_faces`
counts the coarse mesh as the branch does. A loft's section re-split
passes the lead's perimeter shares to main's `resample` (a circle breaks
there when the matched corners do not go round in order). Main's tests of
the mesh-based measure (the SMLib kernel measures exactly) and of the
IGES preprocessor name (no such field on the branch's import record) go.
- doc: a feature result carries no boolean diagnostics on the branch, so
the model cache neither writes nor reads them, and a pattern copy's miss
test runs the intersect as it is. A placed body's worker result is a
Result: a body taken from the previous placement is Ok. A thread's
clipboard remap takes main's arguments, the tapped catalogue names a
metric size by ThreadForm::Metric, and main's tests unwrap the placing
calls that return their error.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
At a pole or apex `EvalSurface::eval` takes the normal from a step beside the
point, trying (+h, +h) first. At the far end of an interval (a sphere's north
pole at u = 1) that step lands past the end, where the extrapolated surface
folds back over the pole, and the normal came out turned over: the pole vertex
shaded dark with a light ring around it (ladder 01/005, every sphere and dome).
Steps now stay inside the active interval of a spline or a revolution's
profile. The pole test checked only that the normal was radial, either way;
it now checks the side too.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
form::extent took the box of 32 points per edge. A face's NURBS form is built
over that box, so where the boundary peaks between two samples the form
stopped short of its edge: the re-imported rod's bore ended at v = 9.99977
while its intersection with the rod reaches 10, and SMLib found the edge
1.9e-4 off the bore (SmBrep #4, SmEdge #13). Each sample higher or lower
than its neighbours now brackets the edge's extreme there, found by golden
section.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0113gDVmStT5tCGKW9Fxgc5K
form::extent unwrapped each loop of a face from its own first point, so a
hole beside the seam (a cross bore through a rod at the rod's seam angle)
came out a period away from the outer loop. The box over both was more than a
turn, cut to one turn from the hole: the face's NURBS form ran over quarters
3..7 while its seam uses lay at 4 and 8, and SMLib found the re-imported
rod's edge ends outside its face domain (SmBrep #70-#72). Each loop after the
first now goes the whole periods along that keep the face's box smallest.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0113gDVmStT5tCGKW9Fxgc5K
With touching: separate (the default) a join groups the joined body's
pieces by face contact. The groups that hold the material of the body
before the feature stay in it (each unless it touches one already kept;
the first group where the lineage doesn't say), and so do the groups that
touch nothing: a virtual grouping later operations take as one body. Every
other group that touches another along an edge or at a point becomes a
body of its own, and the feature's notice says so. The joined body keeps
its name and never holds an edge or point contact. A join that only
grouped pieces apart gives no notice, so KeptSeparate::Apart is gone.
one_body still keeps every piece in one body.
SMLib's export copies an edge or vertex that touching solids share once
per solid, so the record never listed those contacts:
Brep::region_contacts now takes such copies (the same curve and interval
between vertices at the same points, a vertex at the same point) as the
edge or vertex they share. A contact SMLib leaves out of the topology (the
3612 spoke tangent to its hub) is found on the exact geometry, the least
distance within the record tolerance, and reported as KeptSeparate::
Touching ("along a line or at a point").
The pending format change join-touching-bodies stays: older designs kept
pieces touching along an edge or at a point in one body too. Its notes say
so, and the reopened legacy emboss still expects touching: one_body.
Tests restored to their form before cc49081df and 733d3bd19: kernel-cases
2896-join-arm-end-near-ring-wall-gap (one body of two shells), 3379, 3455
and 3526 (no touching: one_body); the engine tests of posts joined while
apart (twice), two cubes for interference, a ring with a cylinder, the
buried tab and a_join_adds_only_its_sketch's 0.1 mm gap.
join_meeting_nothing_keeps_the_first_body expects one body and no notice.
The #3378 spoke stays 1 mm inside the hub.
New tests: blocks touching along an edge are split with the along-an-edge
notice; blocks apart stay one body without one; a ring with an arm on its
corner edge and a hub apart gives ring and hub in one body and the arm on
its own (doc); the engine's notice for an edge contact; the record's
contacts of cubes sharing an edge or a vertex (kernel).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Brep::region_contacts lists each pair of material regions that shares a
face, an edge (used by faces of both) or a vertex, with the most it
shares; pairs not listed are apart. Body::region_contacts reports it for
a boolean's result (lump positions as in Body::lumps), and Body::parts
cuts a body into groups of lumps (lumps is parts of one each). Exact
facts from the record only: no geometry, no decision.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
(cherry picked from commit 64a1d688e68e5f0c5b1f9e4fe0d2facfaa4744be)
A degree-1 patch of four control points on a parallelogram (a plane as an IGES
or STEP B-spline writes it) is that plane at every parameter, so its pcurves
take the plane's closed forms instead of going to SMLib (which drew the rim
circle of 3806's base as a 385-point spline).
SMLib may run a one-face sheet's loop against ours. A use's pcurve is the same
either way, so the loop's way round is read from an edge the face uses once and
every use is matched with it (3806 failed with 'a use SMLib did not keep').
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
exact_pcurves gives each use's pcurve where it has a closed form (or is given)
and None where it has none, without closing the loops; pcurves_within closes
them once every use has its pcurve. TrimFace, TrimEdge, TrimUse and the Trims
trait carry a face to a kernel that makes the pcurves of the uses with none.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
along took u or v the edge's own parameter at slope ±1. A rim SMLib makes (an
extruded or revolved circle, four quarters with scaled knots) runs the face's
quarter grid at another steady pace, and a closed rim's two ends are one point,
so neither its ends nor slope ±1 give its line. The pace is read from the edge's
points a quarter and three quarters along, unwrapped from the middle; the line
is taken only where it lifts onto the edge within the tolerance.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
Validation refuses a circle or ellipse edge, or a cylinder, cone, sphere,
torus or revolution face, without its NURBS form. Test fixtures are built on
forms; seam and domain defects use the form's parameter (one turn = 4).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
- A meridian of a sphere or a tube circle of a torus (a circle in a plane through the axis) has
its exact pcurve on the label: u fixed at the arc's azimuth, v its angle from the outward
radial, alpha + s t.
- A placed revolution has a NURBS form: its profile's control points turned about the axis on
the quarter grid from angle zero, weights multiplied, then its matrix; the record takes forms on
revolutions.
- `form::extent`: a face's parameter box from its boundary projected on its label (the collapsed
parameter at a pole bounds nothing; a boundary that never goes round covers the turn), what its
form is built over with no pcurve involved.
- A face that goes all the way round gets a form of exactly one turn, closed and so periodic.
- `along` projects inside the face's box (a spline extended past its knots, or a profile turned
past the face, has other preimages), and takes a closed form within the record's tolerance, as
the closed forms on analytic surfaces are.
Tests: fits are gone, so curves with no closed form on their face (a tilted circle on a sphere,
an ellipse on a cylinder, an intersection record, a curve weaving across a thread flank) are
asserted refused; the closed-spline fixtures are built as forms. geom 166/166.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
`On::fit` and everything it used (samples, least squares, breaks, filled poles) are deleted, and
the STEP reader no longer retries a face at ten times its tolerance. A pcurve is exact (closed
form, an affine image, or a straight line along a form's parameters) or the face is refused:
"not supported yet: no exact pcurve of <curve> on <surface>".
The rig and ladder are as with the fit (333/372, 101/116; none lost; 3806, already failing, now
refused on import). 16 unit tests that build sphere meridians, torus seams, closed spline
bands, intersection curves and surfaces of revolution on their labels now refuse: those paths
need meridians labelled on their face's meridian plane and revolutions on the quarter grid.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
`form::edge` is the one rule sew and the STEP reader share: a circle about a revolved face's
axis is labelled on that face's frame, and a circle or ellipse edge gets its form. The STEP
reader now gives every imported edge its label and form before any pcurve, and every
cylinder, cone, sphere and torus face its form over the extent its label's pcurves give; the
pcurves, the outer-loop choice and the turn-over test then run on the forms, and the record
carries them.
With the pcurve fit turned off, the STEP and IGES circle cases pass (8 of the 9 import cases
that needed it; 3208's ellipse on an extruded spline surface remains).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
The bend's rim arcs carried frames of their own (x toward the arc's start), a fraction of a
quarter from the bend cylinder's, so their forms were off the cylinder's quarter grid and no
straight pcurve lay along them. `form::on_frame` relabels such a circle on the face's frame (the
same circle, its interval shifted); its form is then on the face's grid, its pcurve u = ±s + c.
`along` takes u or v as the edge's parameter either way along, offset. The volume test steps to
a pcurve's ends exactly (t0(1-f) + t1 f), as an interval's end may now carry rounding.
With the fit off, 38 of the 44 sew cases pass (from 29). With it on, the rig is unchanged
(333/372, ladder 101/116, no case changed).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
Every circle and ellipse edge sew builds now carries its NURBS form, its interval in the form's
parameter; every cylinder, cone, sphere and torus face its form over the extent its label's
pcurves give; and every pcurve is computed on the forms, so a bend's rim circle is a straight
line on the bend and an affine image on the flange, exactly. The volume test evaluates the faces
on their forms. A form interval's end within rounding past its last quarter stays on it.
With the pcurve fit turned off, 29 of the 44 sew cases that needed it pass (from none); with it
on, all 44 pass as before.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
On a plane, a B-spline or NURBS edge's control points go through the plane's affine parameters
and the result is cut exactly (bspline::segment) to the edge's interval, so a circle's form gives
its exact pcurve on any plane. On a spline face (a NURBS form), an edge that runs along the face's
parameters at its own pace gets the straight (u, v) line it is: between its ends' parameters, or
with u or v its own parameter (a rim on the same quarter grid). Each is taken only where it lifts
onto the edge to within 1e-9 of the geometry's size; nothing is fitted.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
A form's parameter is now the angle's quarter on its frame plus the arc's parameter in it, and a
form spans the quarters its interval needs (up to five for a turn). Every form on one frame has
the same parameter at the same angle, so a circle edge and the cylinder it bounds agree along it,
and an arc across the frame's x axis, or starting anywhere, has a form. Traces its label to 1e-14
on such arcs, negative angles and a turn from 30 degrees.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
`brep::form` builds each analytic kind's exact B-spline the way SMLib holds its own: a circle
or ellipse as four rational quadratic quarter arcs from its frame's x axis on [0, 4] (angle and
parameter related in closed form), a cylinder or cone as that circle times a line along the axis,
a sphere as the circle times a half circle of latitude, a torus as the circle times its tube's
circle, a line as the degree-1 B-spline on its own parameter. A circle and every face it bounds
then share one parameterisation. Each traces its label to 1e-14.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BnQawySUFx57iaJZq7z1Fm
A shell's `forward` is about the surface the face's (u, v) are on, its NURBS form when it has
one, which may run against its cylinder, cone, sphere or torus. The kernel read it against the
analytic surface, so a fillet's bore whose form runs the other way was a shaft and an M10 thread
was refused in its 8.5 mm hole. `Face::form_turns` says when the form turns the normal.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Edge::curve_interval (and brep::curve_interval for assemble's edges) gives the interval on the
edge's curve itself: a form circle's angles of its ends, its frame turned by the SMLib conversion
so the angle grows along the NURBS. lip and the ruled surfaces read arcs by it; the hull, the
blend tangents, the patch pcurves, point paths, IGES output and the prism runs evaluate on
Edge::parameters. assemble carries an edge's form through.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The edge mirror of a face's NURBS form: Edge::nurbs keeps the NURBS SMLib holds a conic as, and
the edge's interval and its pcurves' parameter are its. Edge::parameters is the curve every
evaluation at a parameter uses; curve says what the edge is. Nothing writes the form yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Every SMLib analytic surface is a B-spline surface, and its trims are in that NURBS's
parameters. Face::nurbs keeps that NURBS: the face's domain and pcurves are its (u, v), and
`surface` says what the face is. Face::parameters is the surface every (u, v) evaluation uses.
The SMLib conversion reads and writes it (fork FACE_NURBS_FORM, SMLIB_REV c4483f6); the STEP
writer writes the analytic surface and the face's edges without pcurves.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
Loop2::circle and circle_from gave two half arcs, so everything built from a circle came out in
two: an extruded wall in two faces, a rim in two edges, and so every round, chamfer or sweep on
it in two B-spline halves that SMLib cannot join (two separately parameterised arcs meet at
different curve parameters, SmVertex::IsTopologicalVertex; different free-form surfaces are not
topological, SmEdge::IsTopological). A circle is now one arc of a whole turn from its start
angle: one closed edge, one wall with a seam, one round. Sketch circles, the cylinder builder
(circle_from at its seam angle) and every other builder take it through Loop2; SMLib's arc
curves take a whole turn (smlib_sweeps clamps to one) and ArcSweepCylinder makes the whole
cylinder.
Cases, singly on 9f5ad20c: fillets/1191, 2797, 3753 and sweeps/1269, 2295 fail before and pass
now; eight hole and six thread cases give what the base gives (12 pass, booleans/1279,
booleans/307 and threads/2038 fail as on the base).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
The ruled surface's far-curve solve kept its own copy of NURBS Book A2.3. The
geom crate now exposes bspline::basis_derivatives (the basis functions alive at
a parameter and their derivatives up to an order, each from its local knots via
local_basis, on the span tess::span_of picks); tess's second-derivative surface
evaluation and the ruled surface both use it, and the copy is gone. smlib's
mod list back in order.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
Intersection::point started its Newton solve from the last point found (a Cell holding both
surfaces' parameters) when that landed near the leader, as truck took a hinted point. The
answer then depended on what was evaluated before, so CurveEval was not Sync, and the
clearance check, which shares a body's DistanceShape (its edges' CurveEvals) across worker
threads, did not compile; with threads it would also have made the result depend on their
interleaving. Each point is now solved from the leader's own point, the path the hint fell
back to, and the unused trace tolerance goes with the hint.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
Each piece keeps the edge's curve on a sub-interval, a new vertex sits on the curve at each
split, every use becomes uses of the pieces with its pcurve cut at the same parameters
(bspline::segment), wire edges likewise; the result is in canonical order with each
edge's source edge. What a sheet needs so that another's vertex on one of its edges is a
vertex of both.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
part()'s walk becomes renumbered(): the record of given source regions in canonical order.
part() hands it the regions it cuts; canonical() hands it every region as it is, open,
wire and vertex shells included, for records builders put together in their own order.
Each edge's uses come from the walk; a source list naming exactly those uses keeps its
radial order (turned to start at the primary use), as part() did.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
A loop of N >= 5 edges is N four-sided patches about a centre point: each edge split at
the middle of its parameter interval, a spoke from each midpoint to the centre, patch k
on the second half of edge k-1, the first half of edge k and the two spokes beside them.
All patches share one compatible space, so each spoke is the same control points in both
patches it divides and the centre one point; the least-squares solve takes them once
and adds rows opposing the two patches' derivatives across each spoke (tangent there).
The one- and three-/four-sided fill is the one-patch case of the same model. The result
lists each patch's sides (edge pieces with their parameter ranges, or spokes) and the
spoke curves; every pcurve is a straight line in (u, v).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
The loop's edges become the sides of the unit square (three sides: the fourth collapses
to the first corner, a pole), each mapped affinely onto [0, 1]. Opposite sides are made
compatible exactly (split into Bezier pieces at every break, raised to the higher degree,
rejoined), the bilinearly blended Coons patch is the start, and with the boundary rows
held the interior control points solve the G1/G2 rows, the points to pass through and a
vanishing multiple of the thin-plate energy by least squares, refined by halving spans.
Every edge lies on the patch exactly and its pcurve is a straight line in (u, v), affine
in the edge's own parameter: no pcurve is fitted.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
compound concatenates the records and takes the part of all their material, so the result is
in canonical order with each face, edge and vertex numbered from its input. part now keeps an
island inside a void when both its region and the void's material are taken.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
Closed forms on cylinders, cones, spheres and tori; on a spline the basis functions' own
second derivatives (local_basis) through the quotient rule for the weights; zero on a
plane. A revolution has none (its profile evaluator carries first derivatives only).
The seam continuity measure reads normal curvatures from them.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
A lump of a body is the part of one of its material regions: its outer shell, its open and wire
shells and a void for each closed inner shell, renumbered in the record's canonical order, with
the source index of each face, edge and vertex for history. Islands inside those voids are parts
of their own. Read from the regions the record already holds, with no mesh or ray test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
A rotation and a translation move every point, axis and control point and leave parameters,
pcurves, tolerances, orientation and the canonical order as they are: the same B-rep in other
coordinates. Placing a body (assembly instances, patterns) no longer needs a kernel round trip.
Reflections and scalings change parameters or geometry kinds and go to the kernel.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
EvalSurface::wrap asked uv::closed whether a spline closes on itself every
time it evaluated a point outside the knot interval, and that test walks the
whole control net (its extent, then the first and last rows). A tessellation
of a closed spline unwraps its parameters across the seam, so about half its
evaluations are outside: on a coil's helical tube (thousands of control
points) the test was 80% of the tessellation's time, 30 s of the coil
command on SMLib (sweeps/3832, sweeps/793).
EvalSurface::Nurbs now carries `closed`, set by EvalSurface::nurbs from the
same test; wrap and uv::domain read it. An affine map of the surface keeps it
(closedness does not change under one). The answers are the same as before. The constructor's callers in
crates/kernel/src/tess (size.rs, surface.rs) change with it.
Not built: base in progress (rebased onto kernel-smlib/no-truck 41adb372).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
A drawn 3D spline reached the kernel only as its sampled polyline (Wire.pts), so SMLib refused
to sweep along it ("not supported yet: SMLib sweep along a smooth path of points"). The doc
holds the spline's fit points; the curve is the centripetal Catmull-Rom spline that
fit_polyline samples. Each span of it is a cubic (Barry-Goldman), and its derivative at a fit
point depends only on that point, its neighbours and the two knot intervals, so neighbouring
spans share it: the spline is exactly one cubic Bézier per span, C1 across the spans.
- geom: catmull_rom holds the curve: samples() (fit_polyline's arithmetic, moved verbatim;
sketch::fit_polyline now calls it) and beziers(), the exact spans; ArcLength on CurveN
(Gauss-Legendre per knot span, Newton for the parameter at a length).
- kernel: PathSeg::Cubic, a cubic Bézier in space (the 3D counterpart of PathSeg::Curve, which
is planar), with its arms wherever PathSeg is matched (start/end, tangents, length, point at
a length, turn, SMLib curve as a degree-3 NURBS, halving). PointPath / PathPiece carry a path
through 3D sketch curves: polylines as points, drawn splines as their fit points (reversed
when the path runs them backwards); PointPath::segs gives SMLib the spans and the lines;
sweep_point_path_with sweeps it (SMLib through sweep_with, so corners, twist, scale, rails and
orientation take the existing routes). A smooth polyline piece (a projected or linked curve,
which the kernel only has as points) is still refused on SMLib.
- doc: path_points builds the PointPath (a wire with three or more fit points is a spline
piece); solid sweep and pipe call sweep_point_path_with; rails, surface sweeps and curve
networks take its points as before.
Checked in scratch (not committed): the spans pass through every fit point and every
fit_polyline sample at its parameter (1e-12), C1 at the joints and round a closed spline;
samples() is bit-identical to the old fit_polyline over 1180 random open and closed inputs;
SMLib sweeps of a radius-2 circle along an open spline and round a closed one match
pi r^2 L (L by independent quadrature of the curve's definition) to 1e-7 and 3e-8.
sketch/wire.rs: the existing closed-spline test reads SPAN_SAMPLES from its new home.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
uv::project, given no hint that converges within `accept`, evaluated a grid
of up to 16384 points of the whole surface for every point it placed, then
sorted all of them by distance. The grid is the same for every point of a
surface, and a face's pcurves place hundreds of points on one surface: on a
modelled thread's helical faces that grid was most of a boolean's time on
SMLib, in the operands' records, SMLib's export of each body and the
result's (threads/2526, the ladder's threads).
uv::Starts keeps the grid, filled on first use; uv::project_with takes it,
and a face's pcurve fit (pcurve::On) keeps one per face. The 32 nearest
starts are picked with a partial select instead of a full sort, in the same
order (nearest first, grid order where equally near), so every point gets
the parameters it got before. (The tessellation's boundary projection can
take the same grid; crates/kernel/src/tess is the mesh agent's.)
Not built: base in progress (rebased onto kernel-smlib/no-truck 41adb372).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017itGh5fpMEousnZ91cYcVt
jyvikoandClaude Opus 5.5