Implement full MeshIO (OBJ/PLY) by csparker247 · Pull Request #17 · educelab/libcore

csparker247 · 2026-03-25T15:50:25Z

Summary

This PR implements OBJ and PLY mesh IO for libcore — read and write, with three tiers (positions only; positions + UV map; positions + UV map + texture paths). A case-insensitive read_mesh / write_mesh facade dispatches by file extension. The mesh IO track (mesh-io_20260323) is complete.

MeshIO pipeline

io/MeshIO.hpp — facade with case-insensitive extension dispatch (.obj, .OBJ, .Ply all work)
io/MeshIO_OBJ.hpp — read/write OBJ + MTL with per-wedge UVs, multi-chart support via usemtl
io/MeshIO_PLY.hpp — read/write ASCII PLY, read binary little-endian PLY, per-wedge texcoord list + backward-compat per-vertex s/t
Vertex traits (has_normal, has_color) drive compile-time inclusion of normals and colors in both readers and writers
UVMap traits (has_chart) drive multi-chart OBJ output

Supporting additions

utils/MeshUtils.hpp — expand_at_seams for formats needing per-vertex UVs
Mesh: num_vertices, num_faces, clear
String.hpp: zero-allocation split(string_view, vector&, pred) predicate overload, to_string / to_string_view (charconv-based, locale-independent, buffer-reusing), per-type charconv fallbacks
cmake/CheckCharconvFP.cmake replaces CheckToNumericFP.cmake — probes from_chars and to_chars independently for float, double, long double, emitting per-type EDUCE_CORE_NEED_* definitions

Faithful round-trips (no fabricated attributes)

Writers no longer fabricate default attribute values for a trait-capable mesh that has none actually set. Previously a WithNormal / WithColor mesh with empty attributes wrote vn 0 0 0 / inline 0 0 0 (OBJ) and declared nx/ny/nz / red/green/blue with zeros (PLY); reading such a file back materialised unwanted zero normals / black colors, so a capable-but-empty mesh did not round-trip as empty.

New runtime guards in types/Mesh.hpp: has_any_normal(mesh) and has_any_color(mesh) — runtime companions to the compile-time has_normal / has_color traits, returning true only when at least one vertex actually carries the attribute.
OBJ: build_normal_index emits a compact vn pool referenced per-corner (decoupled from vertex index), and inline RGB is gated per-vertex on color.has_value(). Normal-less / color-less vertices emit no attribute data, and partially-attributed meshes round-trip exactly with no fabrication.
PLY: the nx/ny/nz and red/green/blue header declarations (and matching data columns) are gated on has_any_normal / has_any_color. Because a PLY element has fixed properties this is all-or-nothing per attribute — a fully-empty attribute is omitted entirely, while a partial attribute still zero-fills gaps (intrinsic to the format).
Trait-author convention (documented on has_any_normal, with @note pointers from WithNormal, WithColor, and WithChart): traits whose storage carries an unset state (std::optional, or a type like Color with its own empty state) need a has_any_<trait> guard in the writers; plain defaulted-value traits whose default is valid (e.g. WithChart's std::size_t chart, default 0 = first chart) do not.

Hardening

Binary PLY: stream state checked after every read; truncated files throw instead of returning garbage
OBJ: face vertex indices bounds-checked before insert_face
PLY header: element count capped at 500M; malformed element / property lines throw instead of being silently skipped; property before any element throws
PLY face records: texcoord and unknown list property counts capped at 1024 (vertex_indices still capped at 256)
PLY colors: stored in their native precision (U8C3 for uchar, U16C3 for ushort, F32C3 for float/double) instead of being forced through a lossy uchar cast
OBJ mtllib with no argument now throws instead of dereferencing out of bounds
Write-error detection on every write_obj / write_ply tier (catches silent I/O failures like disk full)
Stream error check after OBJ read loop distinguishes I/O errors from normal EOF

Tests

61 cases in tests/src/TestMeshIO.cpp covering round-trips (positions, normals, colors, UVs, textures, multi-chart, N-gons, empty meshes), facade dispatch, all hardening cases (truncated binary PLY, out-of-bounds indices, excessive element / texcoord / list counts, malformed PLY headers, bare mtllib, case-insensitive extensions, native-precision color storage), and faithful round-trips with no fabricated attributes (capable-but-empty meshes emit nothing and round-trip empty; partial normals / colors round-trip exactly). New has_any_normal / has_any_color unit tests in tests/src/TestMesh.cpp.

…ring Extends String.hpp with utilities needed for locale-independent mesh IO serialization and efficient whitespace parsing of OBJ/PLY files. - split(): add predicate overload (single O(n) pass); no-arg overload now splits on any whitespace via the predicate path; string-delimiter overload fast-paths single-char delimiters through the predicate overload - to_string_view(buf, val): caller-supplied buffer variant of to_chars with no heap allocation; intended for hot paths (e.g. per-vertex coordinate output in a write loop) - to_string(val): convenience wrapper over to_string_view for one-off conversions; allocates a std::string Replaces CheckToNumericFP.cmake + CheckToCharsFP.cmake with a unified CheckCharconvFP.cmake that probes from_chars and to_chars separately. EDUCE_CORE_NEED_CHARCONV_FP is now set only by the from_chars probe (the only path with a compile-time fallback). Updates README and conductor artifacts for the mesh-io_20260323 track. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

- Replace split_ws references with split() (no-arg whitespace form) - Update to_string_view usage to caller-provided buffer pattern: to_string_view(buf, val) instead of to_string_view(val) - Record preparatory String.hpp commit (2f67926) in plan overview - Bump updated date to 2026-03-25 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…h-io_20260323) Add compile-time detection traits has_normal<V>, has_color<V>, and has_chart<UVMapT> in detail/MeshTraits.hpp using the std::void_t detection idiom. IO functions use these via if constexpr to conditionally read/write normal, color, and chart data without extra overloads. Register TestMeshIO.cpp and add MeshTraits.hpp to installed headers. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Add read_obj / write_obj across all three tiers in MeshIO_OBJ.hpp. Write uses to_string_view(buf, val) for zero-allocation numeric output. Read uses split() + parse_face_ref() for locale-independent parsing. Detection traits (has_normal, has_color, has_chart) drive all conditional IO via if constexpr. Multi-chart write enforces has_chart via static_assert. Normals are written/read per-vertex; UVs are per-wedge. MTL texture paths are recovered from map_Kd in material-declaration order. Also adds Mesh::num_vertices() / num_faces() required for iteration. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…0260323) - Add MeshUtils.hpp with expand_at_seams: deduplicates (vertex, uv-pool) pairs across face corners, splitting seam vertices and returning a flat per-vertex UV array suitable for PLY output - Add MeshIO_PLY.hpp with write_ply (Tiers 1–3) and read_ply (Tiers 1–2); supports ASCII write, ASCII and binary-little-endian read, per-vertex s/t UV properties, and comment TextureFile header (MeshLab convention) - Add expand_at_seams and PLY round-trip tests (Tasks 3.1, 3.3) covering no-seam, single-seam, binary PLY, UV expansion, texture path round-trip, and missing-file error cases - Register MeshIO_PLY.hpp and MeshUtils.hpp as installed public headers Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…-io_20260323) Add MeshIO.hpp with read_mesh and write_mesh overloads (Tiers 1–3) that dispatch to OBJ or PLY IO by file extension; throw std::runtime_error for unsupported extensions. Add facade dispatch tests for both formats and all three tiers. Register MeshIO.hpp as an installed public header. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…20260323) Security: - parse_face_ref: throw on zero or negative OBJ face index - read_ply_impl: cap per-face vertex count at 256; validate face indices against n_vertices; throw on binary big-endian format Performance: - String::split(): thread_local static locale eliminates per-call mutex - Add split_into() overload; OBJ/PLY ASCII parsers reuse token vector - read_obj_impl: hoist face_verts/face_vts/face_vns outside loop - expand_at_seams: std::unordered_map with documented Fibonacci pair hash Architecture: - write_obj: extract write_obj_vertices/faces helpers; Tiers 1-3a share them - write_ply: extract write_ply_header/data helpers; all tiers share them - Add read_ply(path, mesh, uvmap) Tier 2 overload - read_mesh Tier 2 calls new read_ply Tier 2 directly (no throwaway vector) Testing: - Unique temp dirs via this-pointer hex suffix in all three fixtures - Full 3x3 position verification in all position round-trip tests - Verify all three vertex colors in color round-trip tests - Write-failure tests for write_obj, write_ply, write_mesh - PLY UV coordinate value verification - v/vt/vn combined face format test - PLY malformed header test - NCMesh (normals+colors) OBJ round-trip test - BinaryBE throw test - expand_at_seams empty-mesh test Platform: - CheckCharconvFP.cmake: add long double to_chars probe - String.hpp: to_string_view<long double> fallback via double cast when EDUCE_CORE_NEED_TO_CHARS_LONG_DOUBLE_FALLBACK is defined (macOS-26) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Replace the single EDUCE_CORE_NEED_CHARCONV_FP flag with 6 independent per-type probes (from_chars × {float,double,long double} and to_chars × {float,double,long double}). Each fallback specialisation is now gated on its own definition, so a platform where only long double is missing does not regress float/double paths. to_string_view fallbacks use snprintf (float: %.9g, double: %.17g); long double casts to double (same representation on Apple Silicon). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

csparker247 · 2026-03-26T00:09:16Z

@copilot Review the PR implementation

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…_obj Tier 3b Co-authored-by: csparker247 <1434526+csparker247@users.noreply.github.com> Agent-Logs-Url: https://github.com/educelab/libcore/sessions/d7bca254-3f1d-4647-abdb-4eb0f9586a21

Copilot · 2026-03-26T00:20:06Z

@copilot Review the PR implementation

Reviewed the implementation and fixed issues found:

color_to_rgb (OBJ) and color_to_u8c3 (PLY) — Added missing support for U16C1, U16C3, U16C4, U8C4, and F32C4 color types (4c51c7c)
Duplicate using Vertex declaration in write_obj Tier 3b removed (658cdb5)

All 39 tests pass.

…tive dispatch, and edge-case tests Co-authored-by: csparker247 <1434526+csparker247@users.noreply.github.com> Agent-Logs-Url: https://github.com/educelab/libcore/sessions/50bb342d-a00b-4bf5-9c2b-7c2af9957968

Co-authored-by: csparker247 <1434526+csparker247@users.noreply.github.com> Agent-Logs-Url: https://github.com/educelab/libcore/sessions/50bb342d-a00b-4bf5-9c2b-7c2af9957968

… these implementations.

…ispatch Pre-compute PropRole enum for every PLYProp in parse_ply_header based on element context (vertex vs face). Replace the if-else name-comparison chains in both binary and ASCII vertex/face reader inner loops with switch statements on the pre-computed role, eliminating O(properties) string comparisons per vertex/face. No behavior change; 17/17 tests pass. (mesh-io_20260323)

…reader Pre-compute per-property byte offsets from the PLY header so the binary vertex loop makes one istream::read() per vertex (O(vertices)) instead of one read per property per vertex (O(properties × vertices)). Adds read_ply_prop_from_buf<T> alongside the existing stream-based read_ply_binary_prop<T>; unknown/skipped properties are read into the buffer and their bytes are simply ignored, preserving correct stream positioning without extra istream::ignore() calls. Closes task 5.7 (mesh-io_20260323) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…ly_impl The face-element branch of read_ply_impl contained ~80 lines of nested binary + ASCII parsing logic inside the element loop. Extract into two inline detail functions: - read_ply_face_binary: parses one binary face record from an istream - read_ply_face_ascii: parses one ASCII face record from a token vector Both take a reusable face_indices buffer and texcoords vector as out-params, clearing them before filling. read_ply_impl now delegates to these helpers and constructs the Face from the returned index buffer, reducing the nesting depth and isolating per-face parsing logic. Pre-compute load_texcoords = uvmap != nullptr && has_texcoord once outside the face loop; both helpers receive it as a plain bool. Closes task 5.8 (mesh-io_20260323) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

…_20260323) Tasks were completed in Phase 5 (cb5ee97, 6b9d7f5); carry-forward references in Phase 6 were not ticked at the time.

@brief

- PLYProp, PLYElement, PLYHeader and their members/enums: add @brief + inline ///< comments so EXTRACT_PRIVATE builds cleanly - ply_type_bytes, read_ply_binary_prop, read_ply_impl: add @brief - Fix broken \ref read_ply(path,mesh) (used param names, not types) - MeshIO_OBJ.hpp: escape <stem> as <stem> to suppress Doxygen xml/html tag warning

- product.md: add UVMap, IO, and trait detection to Key Goals - tech-stack.md: add UVMap, MeshUtils, MeshIO, MeshIO_OBJ, MeshIO_PLY to component table - README.md: add MeshIO header-only entries; add Mesh IO usage section

csparker247

@copilot Review the comments.

Addresses all unresolved review comments on the MeshIO implementation PR. ## `MeshIO_PLY.hpp` - **`PLYType` enum** replaces `std::string` for `PLYProp::type` and `list_count_type`; `parse_ply_type()` converts header tokens at parse time. `ply_type_bytes`, `read_ply_binary_prop`, and `read_ply_prop_from_buf` now dispatch via `switch` instead of sequential string comparisons - **Color-type conditions** now match only `PLYType::UChar` / `PLYType::UShort`; removed signed `char`/`short` cases that could produce incorrect casts for negative values - **`trim_right` (string_view)** replaces `trim_right_in_place` in all three ASCII read loops; the trimmed `string_view` is passed directly to `split`, avoiding a redundant cast ## CMake charconv probes - `CheckCharconvFP.cmake` now appends needed definitions to `EDUCE_CORE_CHARCONV_DEFS` instead of calling `add_compile_definitions` - `CMakeLists.txt` applies them via `target_compile_definitions(core PUBLIC ...)`, so they propagate automatically to any downstream target via `target_link_libraries` ```cmake # No manual propagation needed anymore target_link_libraries(foo PRIVATE educelab::core) ``` ## Miscellaneous - `Math.hpp`: `cross()` error message → `"Inputs must be 3-dimensional"` - `String.hpp`: comment at predicate-dispatch call site clarifying it routes to the `is_invocable_r_v`-constrained overload, not back into the variadic template - `README.md`: charconv section updated with correct per-type definition names (`EDUCE_CORE_NEED_FROM/TO_CHARS_{FLOAT,DOUBLE,LONG_DOUBLE}`) and revised cmake example reflecting automatic propagation - `conductor/product.md`: trimmed goal #4 per suggestion --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: csparker247 <1434526+csparker247@users.noreply.github.com>

Flip if/else blocks with a small false branch into early continue/return/skip, hoisting the main body out one indent level. - PLY: read_ply_face_ascii inner loop (matches read_ply_face_binary) - PLY: skip_binary_prop lambda - OBJ: read_obj_impl MTL parse block (early return) - OBJ: write_obj Tier 3b chart-grouping loop Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

write_obj previously emitted one vn per vertex via value_or(zero) with the vn index tied to the vertex index, so a WithNormal mesh with no normals set got fabricated "vn 0 0 0" lines (and v//vn refs), and partial meshes got zeros in the gaps. Decouple the vn pool from the v pool: build_normal_index assigns a compact 1-based vn index in vertex order only to vertices that carry a normal. The vn block and all face writers (shared + Tier 3b chart-grouped) reference it per corner, so normal-less meshes emit no vn at all and partial meshes reference normals only where present. Add regression tests for the no-normals and partial-normals cases. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

A WithColor-capable mesh with no colors set previously wrote fabricated black: OBJ appended "r g b" of 0,0,0 to every v line; PLY declared red/green/blue and wrote 0 0 0 per vertex. Mirrors the earlier normals fix. Add has_any_color(mesh) to Mesh.hpp as the runtime companion to the compile-time traits::has_color, alongside has_any_normal. OBJ gates inline RGB per vertex (its v lines carry color positionally and the reader detects it per line), so partial meshes round-trip without fabrication. PLY's fixed-property element forces an all-or-nothing header decision: declare red/green/blue only when some color exists (partial meshes still zero-fill gaps, intrinsic to PLY). Add has_any_color unit test plus OBJ/PLY no-color and OBJ partial-color regression tests. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

@note

Record why optional-bearing traits (WithNormal, WithColor) need a has_any_<trait> runtime guard in the I/O writers while plain defaulted-value traits (WithChart) do not. The authoritative "trait authors" note lives on has_any_normal; WithNormal/WithColor/WithChart carry @note pointers to it so the rule is discoverable from wherever a new trait gets defined. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…work Reconcile stale track artifacts with the completed work: mark the Mesh IO track Complete (deps resolved), correct progress to 7/7 phases / 39/39 tasks, and clear the "⚠ blocked" marker from the conductor index. Add Phase 7 to the plan documenting the no-fabrication round-trip work (has_any_normal / has_any_color, compact OBJ vn pool, per-vertex inline RGB, gated PLY attribute declarations, trait-author convention docs). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

csparker247 and others added 8 commits March 25, 2026 06:38

chore: mark Phase 1 complete (mesh-io_20260323)

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chore: mark Phase 2 complete (mesh-io_20260323)

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chore: mark Phase 3 complete (mesh-io_20260323)

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

csparker247 commented Mar 25, 2026

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chore: mark Phase 4 and track complete (mesh-io_20260323)

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

chore: mark Phase 5 tasks 5.1-5.5 complete (mesh-io_20260323)

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Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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fix(MeshIO): support all Color types in color_to_rgb and color_to_u8c3

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fix(MeshIO_OBJ): remove duplicate 'using Vertex' declaration in write…

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fix(MeshIO): add stream error checks, bounds validation, case-insensi…

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style: restore section separators lost during edit

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Copilot AI changed the title ~~Feature/mesh io 20260323~~ Harden mesh IO: stream validation, bounds checks, case-insensitive dispatch Mar 26, 2026

Copilot finished work on behalf of csparker247 March 26, 2026 00:41

csparker247 added 5 commits March 26, 2026 10:05

Remove detail/MeshTraits

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Rename split_into -> split and define new vector versions in terms of…

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… these implementations.

String: docs and tests

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OBJ: Review

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Fix regressions

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csparker247 and others added 11 commits April 21, 2026 19:58

chore: mark task 5.6 complete (mesh-io_20260323)

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chore: mark task 5.7 complete (mesh-io_20260323)

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chore: mark task 5.8 complete (mesh-io_20260323)

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chore: mark Phase 6 carry-forward tasks 5.7 and 5.8 complete (mesh-io…

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…_20260323) Tasks were completed in Phase 5 (cb5ee97, 6b9d7f5); carry-forward references in Phase 6 were not ticked at the time.

chore: mark Doxygen verification complete (mesh-io_20260323)

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chore: mark track mesh-io_20260323 complete

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csparker247 changed the title ~~Harden mesh IO: stream validation, bounds checks, case-insensitive dispatch~~ Implement full MeshIO (OBJ/PLY) Apr 23, 2026

claude: Harden

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csparker247 commented Apr 23, 2026

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Tweak README

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csparker247 mentioned this pull request Apr 23, 2026

Remove floating-point to_numeric specializations #1

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csparker247 and others added 8 commits April 23, 2026 18:56

Fix PLY write with no normals

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Finalize tests, document multichart limits

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README: Restore include-only note

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csparker247 marked this pull request as ready for review June 24, 2026 00:15

csparker247 merged commit 8eb070c into develop Jun 24, 2026
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Implement full MeshIO (OBJ/PLY)#17

Implement full MeshIO (OBJ/PLY)#17
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Summary

MeshIO pipeline

Supporting additions

Faithful round-trips (no fabricated attributes)

Hardening

Tests

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csparker247 commented Mar 25, 2026 •

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