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smlib: a sweep along lines and arcs goes piece by piece on solidcore, as the capi does

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SMLib 90aabff's smlib_sweep_placed sweeps a path of lines and arcs that turns with the path
(not closed, each piece leaving in the direction the one before arrives in) one segment at a
time, exactly: a line by the linear sweep, an arc by the rotational sweep, the profile
carried from each to the next, every piece's faces copied into one B-rep and stitched, the
caps the profile at both ends. The port (from solidcore#1581's head) sent that path to the
curve sweep, whose fitted walls differ from the C++ kernel's cylinder and torus. `segmented`,
`carried` and `piecewise` (with `Rigid` and `Segment`) are ported, ahead of the curve sweep.

On solidcore the second piece's copy fails: copy_faces without the merge into a B-rep that
already has faces finds no notification record for what it makes (solidcore#TBD, repro in
the bug file), so sweep_along_a_bent_path is ignored on solidcore until that is fixed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MNXLXkZLQ6T7TSi4wswcmk
This commit is contained in:
Brett Lawson
2026-10-30 04:59:06 +01:00
parent 97d79e3b88
commit 6a3558a966
2 changed files with 195 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/smlib/src/core/sweep.rs
+194 -3
View File
@@ -1,7 +1,7 @@
//! Extrusions, revolutions, sweeps, lofts and planar faces on solidcore: the C API's logic round
//! SM_API's sweeps, ported from the fork's `capi/src/smlib_sweeps.cpp` (`coord_ok`, `unit`,
//! `line`, `arc`, `nurbs`, `parse`, `finish`, `one_loop`, `straight`, `circular`, `joined`,
//! `put_motion`, `turned`, `maps_ok`, `placed`, `put_curve`, and the entry points
//! `put_motion`, `turned`, `Rigid`, `Segment`, `segmented`, `carried`, `piecewise`, `maps_ok`, `placed`, `put_curve`, and the entry points
//! `smlib_planar_faces`, `smlib_extrude`, `smlib_revolve`, `smlib_sweep_placed`, `smlib_loft`,
//! `smlib_loft_to_point`, `smlib_sweep_stations`, `smlib_project_curves`, `smlib_face_section`,
//! and `smlib_screw_sweep` and `smlib_screw_sweep_radial` with `Screw`, `Stations`,
@@ -24,7 +24,6 @@
use std::f64::consts::{PI, TAU};
use solidcore::EntityRef;
use solidcore::curve::curve::p3::compute_crvs_normal;
use solidcore::curve::curve::{Curve, CurveKind};
use solidcore::curve::ellipse::Ellipse;
@@ -46,16 +45,19 @@ use solidcore::sweep::api_brep::{
create_rotational_sweep, create_taper_extrude_with_corner,
};
use solidcore::sweep::api_surfaces::create_skin_primitive;
use solidcore::topology::brep::p1 as brep_p1;
use solidcore::topology::brep::p1::{ParallelProjectionOptions, create_parallel_projection_curves};
use solidcore::topology::brep::p2::{ArenaNotifyState, is_manifold_solid};
use solidcore::topology::brep::p3::new_brep;
use solidcore::topology::brep::p4::stitch_faces;
use solidcore::topology::brep::p5::{StitchAndOrientOptions, stitch_and_orient};
use solidcore::topology::brep::p7::copy_faces;
use solidcore::topology::brep::p8::{
FaceBuildEnv, create_face_from_surface, create_faces_with_curves, create_planar_face_with_3d_curves, create_planar_faces_with_3d_curves,
};
use solidcore::topology::topology_traverser::Marks;
use solidcore::topology::{Brep, FaceId};
use solidcore::{EntityRef, SolidError};
use super::blend::status;
use super::offset::{face_miss, pick_faces};
@@ -470,9 +472,186 @@ fn motion(x: Vec3, y: Vec3, z: Vec3, t: Vec3) -> Affine {
Affine { m: [[x.x, x.y, x.z], [y.x, y.y, y.z], [z.x, z.y, z.z]], t: [t.x, t.y, t.z] }
}
/// A rigid motion p -> R p + t, R by its columns (`Rigid`).
#[derive(Clone, Copy)]
struct Rigid {
x: Vec3,
y: Vec3,
z: Vec3,
t: Vec3,
}
impl Rigid {
const IDENTITY: Rigid =
Rigid { x: Vec3::new(1.0, 0.0, 0.0), y: Vec3::new(0.0, 1.0, 0.0), z: Vec3::new(0.0, 0.0, 1.0), t: Vec3::new(0.0, 0.0, 0.0) };
/// This motion, then a turn of `angle` right-handed about the unit `k` through `c`.
fn turned_by(&self, c: Vec3, k: Vec3, angle: f64) -> Rigid {
Rigid { x: turned(self.x, k, angle), y: turned(self.y, k, angle), z: turned(self.z, k, angle), t: c + turned(self.t - c, k, angle) }
}
/// This motion, then a move by `d`.
fn moved_by(&self, d: Vec3) -> Rigid {
Rigid { t: self.t + d, ..*self }
}
/// As the placement `SmCurve::Transform` takes: the world frame's image.
fn placement(&self) -> Axis2Placement {
Axis2Placement::new(self.t, self.x, self.y)
}
fn motion(&self) -> Affine {
motion(self.x, self.y, self.z, self.t)
}
}
/// One segment of a path of lines and arcs (`Segment`): a line from `a` along the unit `dir` for
/// `length`, or an arc turning `angle` (radians) right-handed about the unit `k` through `c`,
/// `length` along.
#[derive(Clone, Copy)]
struct Segment {
arc: bool,
dir: Vec3,
c: Vec3,
k: Vec3,
angle: f64,
length: f64,
}
impl Segment {
/// The motion `m` carried `s` of the way along (0 <= s <= length).
fn carry(&self, m: &Rigid, s: f64) -> Rigid {
if self.arc { m.turned_by(self.c, self.k, self.angle * s / self.length) } else { m.moved_by(self.dir * s) }
}
}
/// `segmented`: whether `path` (parsed from `given`) is two or more lines and arcs end to end,
/// each leaving in the direction the one before arrives in, and not closed: then its segments.
fn segmented(k: &Kernel, given: &[Profile], path: &[Curve]) -> solidcore::Result<Option<Vec<Segment>>> {
if given.len() != path.len() || path.len() < 2 {
return Ok(None);
}
let unit = |v: Vec3| v * (1.0 / v.length());
let mut out = Vec::with_capacity(path.len());
// The direction the path arrives in at the end of the segment before, and where it ends.
let (mut before, mut first, mut prev) = (None::<Vec3>, None::<Point3>, None::<Point3>);
for (g, c) in given.iter().zip(path) {
let (a, b) = ends(k, c)?;
let (seg, leaving, arriving) = match g {
Profile::Line { .. } => {
let length = (b - a).length();
if !(length > 1e-12) {
return Ok(None);
}
let dir = (b - a) * (1.0 / length);
(Segment { arc: false, dir, c: Vec3::new(0.0, 0.0, 0.0), k: Vec3::new(0.0, 0.0, 0.0), angle: 0.0, length }, dir, dir)
}
Profile::Arc { center, axis, radius, start, end, .. } => {
let (ctr, kv) = (v3(*center), unit(v3(*axis)));
let angle = end - start;
let seg = Segment { arc: true, dir: Vec3::new(0.0, 0.0, 0.0), c: ctr, k: kv, angle, length: radius * angle };
(seg, unit(kv.cross(a - ctr)), unit(kv.cross(b - ctr)))
}
_ => return Ok(None),
};
match (first, prev, before) {
(None, ..) => first = Some(a),
(Some(_), Some(p), Some(d)) => {
if (a - p).length() > 1e-9 || leaving.dot(d) < 1.0 - 1e-12 {
return Ok(None);
}
}
_ => return Ok(None),
}
prev = Some(b);
before = Some(arriving);
out.push(seg);
}
match (first, prev) {
(Some(f), Some(p)) if (f - p).length() > 1e-6 => Ok(Some(out)),
_ => Ok(None),
}
}
/// `carried`: copies of the profile's curves carried by `m`.
fn carried(k: &Kernel, profile: &[Curve], m: &Rigid) -> solidcore::Result<Vec<Curve>> {
let at = m.placement();
let mut out = Vec::with_capacity(profile.len());
for c in profile {
let mut copy = c.clone();
copy.transform(k, &at, None).map_err(|_| SolidError::sm_err("SmCurve::Transform"))?;
out.push(copy);
}
Ok(out)
}
/// `piecewise`: the profile swept along a path of lines and arcs, turning with it: each segment
/// swept on its own, exactly (a line by SM_API's linear sweep, an arc by its rotational sweep), the
/// profile carried from each to the next, and the walls sewn along the sections they share; with
/// the motions to the first section, the one half-way along and the last.
fn piecewise(k: &mut Kernel, profile: &[Curve], segs: &[Segment], cap: bool) -> solidcore::Result<Out<(Brep, [Affine; 3])>> {
let mut b = new_brep(k, USE_DEFAULT, USE_DEFAULT)?;
let mut m = Rigid::IDENTITY;
let mut starts = Vec::with_capacity(segs.len());
let mut total = 0.0;
for g in segs {
starts.push(m);
total += g.length;
let section = carried(k, profile, &m)?;
let refs: Vec<Option<&Curve>> = section.iter().map(Some).collect();
let piece = if g.arc {
create_rotational_sweep(k, &refs, g.c, g.k, g.angle * 180.0 / PI, false)
} else {
create_linear_sweep(k, &refs, g.dir, g.length, false)
};
let mut piece = match piece {
Ok(p) => p,
Err(e) => return Ok(Err(status(e))),
};
let faces = brep_p1::faces(&piece, None)?;
let mut state = ArenaNotifyState::new(&piece);
state.seed(&b);
let mut env = state.env(None);
let key_of = env.key_of;
let this_face = |f: FaceId| key_of(EntityRef::Face(f));
match copy_faces(k, &mut piece, &faces, &mut b, false, &this_face, &mut env) {
Ok((_, true)) => {}
Ok((_, false)) => return Ok(Err(status(SolidError::sm_err("CopyFaces")))),
Err(e) => return Ok(Err(status(e))),
}
m = g.carry(&m, g.length);
}
let Some(&start) = starts.first() else { return Ok(Err(Error::Argument)) };
if cap {
// The caps: the profile where the path starts and where it ends.
for at in [start, m] {
let section = carried(k, profile, &at)?;
let (region, tol) = (b.infinite_region(), b.tolerance());
if let Err(e) = build_faces(&mut b, |b, fenv| create_planar_faces_with_3d_curves(k, b, region, &section, tol, fenv)) {
return Ok(Err(status(e)));
}
}
}
if let Err(e) = stitch_and_orient(k, &mut b, &StitchAndOrientOptions::default()) {
return Ok(Err(status(e)));
}
b.refresh_cached_topology();
let mut half = 0.5 * total;
let mut middle = m;
for (i, (g, from)) in segs.iter().zip(&starts).enumerate() {
if half <= g.length || i + 1 == segs.len() {
middle = g.carry(from, half.min(g.length));
break;
}
half -= g.length;
}
Ok(Ok((b, [start.motion(), middle.motion(), m.motion()])))
}
/// `smlib_sweep_placed`: `profile` swept along `path`, with the rigid motions that placed it at
/// the start, half way and the end. Along a straight path the sweep is SM_API's linear sweep, and
/// turning with arcs about one axis its rotational sweep: both build the walls exactly.
/// turning with arcs about one axis its rotational sweep: both build the walls exactly, as the
/// sweep piece by piece does along lines and arcs that turn with the path ([`piecewise`]).
pub(crate) fn sweep_placed(profile: &[Profile], path: &[Profile], frame: SweepFrame, cap: bool) -> Result<(Body, [Affine; 3])> {
let mut placed = [motion(Vec3::new(1.0, 0.0, 0.0), Vec3::new(0.0, 1.0, 0.0), Vec3::new(0.0, 0.0, 1.0), Vec3::new(0.0, 0.0, 0.0)); 3];
let body = making("smlib_sweep", |k| {
@@ -514,6 +693,18 @@ pub(crate) fn sweep_placed(profile: &[Profile], path: &[Profile], frame: SweepFr
}
return finish(r, cap);
}
// Along lines and arcs, turning with the path, the sweep is exact piece by piece.
if frame == SweepFrame::Follow
&& let Some(segs) = segmented(k, path, &along)?
{
return Ok(match piecewise(k, &curves, &segs, cap)? {
Ok((b, motions)) => {
placed = motions;
finish(b, cap)?
}
Err(e) => Err(e),
});
}
let path_curve = match joined(&along)? {
Ok(b) => Curve::from(b),
Err(e) => return Ok(Err(e)),
crates/smlib/src/core/sweep_tests.rs
+1 -1
View File
@@ -412,7 +412,7 @@ cases!(
revolve_rectangle_quarter,
sweep_circle_straight,
sweep_circle_along_an_arc,
sweep_along_a_bent_path,
sweep_along_a_bent_path: ignore = "solidcore#TBD: copy_faces (no merge) into a B-rep that already has faces fails, notify finding no record for the copy (the second piece of the piecewise sweep)",
sweep_round_a_closed_path,
loft_two_squares,
loft_two_circles,