e052d198797481aea49a2e799a2bd8d79b5ff15c
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Commits
| Author | SHA1 | Message | Date | |
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 Irakli Kourtisandjyviko
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587cf865b8 |
Display tessellation plans (4/4): one GPU dispatch for the scene, intersection edges by Newton (#806)
Packs the scene's planned bodies into one GPU upload and dispatch, and evaluates intersection edges by seeded Newton refinement from a fitted B-spline through exactly solved leader points, falling back to the previous evaluation near tangency. Intersection nodes carry their faces' parameters. This changes speed, not what the app draws. Part 4 of 4 of #303. Co-authored-by: jyviko <2501648+jyviko@users.noreply.github.com> |
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Irakli KourtisandClaude Opus 5.5
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201e9d5f9f |
Patch fills non-planar edge loops with one smooth face (#250) (#472)
* Add a one-surface fill of closed 3D loops to geom
A closed loop of curves that does not lie in a plane has no exact surface;
the usual answer is one smooth face fitted over it. fill_loop does that:
- the loop's best-fit plane (Newell normal), with a frame chosen from the
loop itself so the result does not depend on where the loop starts, its
direction, or where the part sits
- the loop seen along that normal must be simple and must not fold or run
along the normal; otherwise it is refused ("not supported yet"), never
filled with wrong geometry
- one non-rational bicubic B-spline height field over the loop's box,
fitted by least squares to the loop's samples (The NURBS Book 9.4.1,
9.4.3, eq. 9.62/9.65) with a thin-plate smoothness term
lambda*A*int(h_uu^2 + 2 h_uv^2 + h_vv^2), A one grid cell's area, so the
fit is the same at any scale; only planes are reproduced exactly
- span counts per direction (long narrow loops fit), refined until the
loop is within tolerance, else refused with the deviation reached
bspline: bisected span search, basis functions on a stack array, one
clamping helper shared by curves and surfaces, one binomial helper.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J53sR6gEaVt56soFDpTck8
* Patch fills non-planar loops of edges with one smooth face (#250)
surface.patch with edges refused any loop that is not planar ("not
supported yet: patching a loop that is not planar"). It now fills it:
- planar loops still get one exact planar face, but planarity is certified
conservatively: lines by their ends, B-spline/NURBS edges by their control
points, intersection curves by their samples lying on a support plane
within tolerance; a loop that can't be certified is filled instead
- other loops get one face from geom's fill_loop, bounded by the body's own
chained edges, whole (no split): its history is one generated face whose
edges are the body's, and it stitches back into a closed solid
- intersection-curve edges are sampled by a seeded, guarded double
projection shared by the planarity test and the fill (plane_fit)
- the face tolerance is 10x the planarity tolerance (documented: later
operations take the face to contain its edges within it)
- edge picking runs inside the guard; the geom->truck conversion is shared
with the T-spline sheets (spline_conv); the Newell plane fit is shared with
STEP import
Tests: 3- to 8-sided, concave (dart, arrow, plus), flat-corner, two-edge and
imported rims fill as one face and stitch closed (volumes against an
independent integral); finite mesh normals, same result for any pick order
or placement; non-height-field loops and too-fine detail are refused.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J53sR6gEaVt56soFDpTck8
* Test the Patch dialog filling a non-planar loop of picked edges
The Patch dialog's only test used a sketch profile. Picking the four
curved rim edges of a box cut by a sideways cylinder now makes one
surface.patch command whose result is a single smooth face over the rim.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J53sR6gEaVt56soFDpTck8
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Iraklis KourtisandClaude Opus 5.5
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a04ef4ca59 |
T-spline core library and sheet bodies (#250, step 1) (#337)
* Add B-spline basis, knot insertion and NURBS surfaces to geom Freeform faces need local refinement and gap-free joins between patches with different knot vectors, which tensor B-spline grids cannot give; T-splines can, and the first user is an N-sided Boundary Fill of non-planar loops. This lays the univariate groundwork they rest on, in the L0 geometry crate so it stays independent of the B-rep kernel: - Cox-de Boor basis of one function from its local knot vector, on half-open spans with a left-limit side for the domain end, with derivatives (NURBS Book eq. 2.5, 2.9) - knot insertion into a single basis function (Sederberg et al. 2004 section 3) and Bezier extraction of one function by repeated insertion - Boehm knot insertion for curves (NURBS Book A5.1), de Casteljau evaluation and sub-segments - a rational tensor NURBS surface with evaluation, knot insertion and clamping, and a rational Bezier patch type All input is checked (finite, monotone knots, positive weights, size caps) and returns SplineError; nothing indexes unchecked. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J53sR6gEaVt56soFDpTck8 * Add T-spline surfaces: T-mesh, evaluation, AS check, refinement, extraction Tensor B-spline faces refine only by whole rows and columns and cannot join patches with different knot vectors without gaps. T-splines allow T-junctions in the control net, which fixes both; the first user is an N-sided Boundary Fill. This adds the maths only (no command, no change in behaviour): - T-mesh in index space with knot values per line, validated (outer rectangle, rectangular faces, no empty lines, size caps); local knot vectors read off rays from each vertex, rays leaving the mesh repeat the boundary (Sederberg et al. 2003 section 3) - rational T-spline evaluation and first derivatives for odd bi-degree, with a complete (p-1)/2-line frame and the domain inside it - T-junction extensions and the analysis-suitability check (Scott et al. 2012 section 2) - local refinement that keeps the surface exactly: requested knot lines are cut in, then every original blending function is carried as a record and split (violation 1) or the mesh gains edges (violations 2 and 3) until each record is a blending function of the refined mesh (Sederberg et al. 2004 section 3); analysis-suitable input stays analysis-suitable by carrying conflicting T-junctions across faces - NURBS <-> T-spline conversion for meshes without T-junctions, and Bezier extraction over the rectangles no blending-function knot line crosses Measured: regular T-spline vs NURBS < 1e-12, round trip exact, partition of unity with T-junctions < 1e-14, refinement deviation <= 1.4e-14 over 40 random refinements, Bezier patches vs surface < 1e-14. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J53sR6gEaVt56soFDpTck8 * Convert T-splines to sewn NURBS sheet bodies in the kernel A T-spline is only useful to the modeller once it is a B-rep face set. tspline_sheet builds an open shell: a mesh without T-junctions becomes one clamped NURBS face; otherwise each Bezier element is a face, and sides are split at the T-points where neighbours' corners land, so all faces share vertices and edges and the sheet is one oriented shell (V - E + F = 1). Every truck call runs under guard. No command yet; Boundary Fill will be the first caller. Tests: one face for a regular surface, sewn Bezier faces with T-junctions, tessellated points on the surface to ~1e-9 mm, and hostile control nets (coincident, 1e300, needle-thin) never panic. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01J53sR6gEaVt56soFDpTck8 --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> |