forked from 1b-agent/opencadstudio-upstream
Hakan SevenandClaude Sonnet 4.6
cda8078905
Comprehensive backlog of acadrust entity fields, behaviors, and subsystems not yet integrated into H7CAD rendering, snap, grip, and properties systems. Covers tessellation gaps, OCS→WCS transform, ByBlock style resolution, snap/grip point gaps, text rendering, and DXF reader unit bugs. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
197 lines
8.8 KiB
Markdown
197 lines
8.8 KiB
Markdown
# acadrust Integration Gaps
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Missing or incomplete integrations between acadrust entity definitions and H7CAD rendering/interaction systems. Ordered by priority within each category.
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---
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## Entity Field Gaps (acadrust fields ignored in tessellation)
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### High Impact
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| Entity | Ignored Field(s) | Effect |
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|---|---|---|
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| **INSERT** | `column_count`, `row_count`, `column_spacing`, `row_spacing` | MINSERT array inserts not expanded — only one copy rendered |
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| **LWPolyline** | `constant_width`, vertex `start_width` / `end_width` | Polylines always render at zero width; thick/tapered strokes lost |
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| **Polyline (legacy)** | `Vertex2D.start_width` / `end_width` | Same as above for old-format polylines |
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### Medium Impact
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| Entity | Ignored Field(s) | Effect |
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|---|---|---|
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| **Dimension** | `DIMSCALE`, `DIMASZ`, `DIMEXO`, `DIMEXE` (from dimstyle) | Arrow size hardcoded to `0.12`; extension line offsets fixed regardless of style |
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| **Spline** | `weights` (rational NURBS control point weights) | Circles/conics stored as NURBS lose curvature precision; treated as uniform B-spline |
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| **Spline** | `flags.closed` / `flags.periodic` | Closed splines may have a gap or C1 discontinuity at the join |
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| **Text / MText** | `normal` extrusion XY | Entities on tilted planes render flat in XY (rare in 2D drawings) |
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| **Hatch** | `BoundaryEdge::Spline` tessellation | Spline boundary edges plotted point-to-point instead of smooth B-spline curve — boundary appears angular |
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| **MultiLeader** | `MultiLeaderPathType::Spline` | Spline-type leader lines rendered as straight segments instead of smooth curves |
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| **RasterImage** | `clip_boundary` (polygonal/rectangular) | Clip boundary read but not applied — image renders full rectangle regardless of clip region |
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### Low Impact
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| Entity | Ignored Field(s) | Effect |
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|---|---|---|
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| **Arc / Circle / Line / Polyline** | `thickness` | No 3D extrusion along Z; invisible in pure 2D views |
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| **LWPolyline** | `plinegen` flag | Linetype pattern resets at each vertex instead of continuing |
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---
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## Entity Type Gaps (entire types with missing subsystems)
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### Renders Nothing / Placeholder Only
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| Entity | Status |
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| **Face3D** | No tessellation — renders as small cross only; no snap, grip, or properties |
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| **OLE2Frame** | Bounding box + X mark only; no interactivity |
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### Wire Fallback Only (no full mesh)
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| Entity | Missing |
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| **Solid3D / Region / Body** | Only ACIS wire fallback; no grip, no properties panel |
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### Partial Render
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| Entity | Missing |
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| **Viewport** (paper space) | Only frame rendered; interior model-space view not composited |
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---
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## Systemic Gap — OCS→WCS Transform
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17 entity types carry a `normal` extrusion vector defining their Object Coordinate System but **none apply the arbitrary-axis OCS→WCS transform** during tessellation. When `normal ≠ (0, 0, 1)` the entity is incorrectly rendered flat in the XY plane.
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**Affected entities:** Arc, Circle, Ellipse, Point, Line, Spline, LwPolyline, Polyline, AttributeDefinition, AttributeEntity, Dimension, Hatch, MLine, Leader, Insert, Shape
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**Only mitigation today:** `Arc` checks `normal.z < 0` to reverse sweep direction — not a real OCS transform.
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**Impact:** Low for typical 2D plan files (nearly all normals are `(0,0,1)`); high for 3D DXF files with entities on non-horizontal planes.
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The DXF arbitrary-axis algorithm:
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```
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if |Wx| < 1/64 and |Wy| < 1/64:
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Ax = (0,0,1) × N (Y-world cross N)
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else:
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Ax = (0,1,0) × N (X-world cross N)
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Ax = normalize(Ax)
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Ay = N × Ax
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```
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Then transform each OCS point: `WCS = origin + x*Ax + y*Ay + z*N`
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---
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## Render Style Gaps (color, linetype, lineweight resolution)
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### High Impact
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| Gap | Effect | Location |
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|---|---|---|
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| **ByBlock color** not resolved through INSERT chain | ByBlock entities render white instead of inheriting INSERT's color | `render.rs::render_style_for()` |
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| **ByBlock linetype** not resolved through INSERT chain | ByBlock entities use default linetype instead of INSERT's linetype | `render.rs::render_style_for()` |
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### Medium Impact
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| Gap | Effect | Location |
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| **ByBlock lineweight** resolved from layer instead of INSERT entity | Block children with ByBlock weight don't inherit INSERT's line weight | `render.rs` lines 213-228 |
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---
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## Text & Style Gaps
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### Medium Impact
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| Gap | Effect | Location |
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| **TextStyle `is_backward`** flag ignored | Text with backward flag renders left-to-right instead of mirrored | `src/entities/text_support.rs::resolve_text_style()` |
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| **TextStyle `is_upside_down`** flag ignored | Text with upside-down flag renders normally instead of flipped vertically | `src/entities/text_support.rs::resolve_text_style()` |
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### Low-Medium Impact
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| Gap | Effect | Location |
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| **Complex linetype text shapes** not rendered | Linetypes with embedded text elements (e.g. GAS_LINE with "GAS" text) show only geometry gaps | `src/scene/complex_lt.rs` |
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---
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## Polyline3D Vertex Type Gap
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acadrust `Vertex3D` carries `VertexFlags` (SPLINE_VERTEX, SPLINE_CONTROL) but `tessellate_polyline3d()` ignores them entirely — all vertices treated as plain points regardless of spline flag.
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**Effect:** Polyline3D entities with spline fitting render as straight segments instead of smooth curves.
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**Location:** `src/entities/polyline.rs::tessellate_polyline3d()`
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**Impact:** Medium.
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---
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## Snap Point Gaps
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### Critical / High
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| Entity | Missing Snap | Effect | Location |
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| **INSERT** | `Insertion` snap point entirely absent | Cannot snap to block reference insertion point with OSNAP Insertion | `src/entities/insert.rs` — no `snap_pts` in TruckEntity |
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| **INSERT** | Nested entity snap points not traversed | Cannot snap to geometry inside a block without exploding it | `src/snap/mod.rs` — only top-level wire snap_pts checked |
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| **Hatch** | All snap points empty | Cannot snap to hatch boundary vertices/arcs with Endpoint or Midpoint | `src/scene/tessellate.rs:558` — returns `snap_pts: vec![]` |
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### Medium
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| Entity | Missing Snap | Effect | Location |
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| **Dimension** | No snap hints on geometry | Cannot snap to dimension defpoints, line endpoints | `src/scene/tessellate.rs:247` — `snap_pts: vec![]` |
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| **Spline** | Fit/control points not in snap_pts | Cannot snap to spline construction points | `src/entities/spline.rs:42` |
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| **MultiLeader** | Vertices not in snap_pts | Cannot snap to leader line endpoints | `src/entities/multileader.rs:116` |
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| **MLine** | Vertices not in snap_pts | Cannot snap to multiline segment endpoints | `src/entities/mline.rs:97` |
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### Low
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| Entity | Missing Snap | Effect | Location |
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| **Ellipse** (partial arc) | Endpoints not in pre-baked snap_pts | Arc endpoints emitted only as `Center`; functional via wire tessellation but semantically wrong | `src/entities/ellipse.rs:108` |
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| **Hatch** | Elevation Z ignored | Snap Z is always 0 instead of `hatch.elevation` | `src/scene/tessellate.rs:564` — hardcoded `0.0` |
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---
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## Grip Gaps
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| Entity | Missing Grip | Effect | Location |
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| **LWPolyline** | Midpoint grips between vertices (arc segment handles) | Cannot drag a segment midpoint to adjust arc bulge | `src/entities/lwpolyline.rs` |
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---
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## Text Rendering Gaps
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| Gap | Effect | Location |
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| **TextStyle `is_backward`** flag not applied | Text with backward flag renders left-to-right | `src/entities/text_support.rs::resolve_text_style()` |
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| **TextStyle `is_upside_down`** flag not applied | Text with upside-down flag renders normally | `src/entities/text_support.rs::resolve_text_style()` |
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| **Unicode characters** not in CXF fonts silently dropped | Non-ASCII characters render as blank gaps with no warning | `src/scene/cxf.rs:174` |
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---
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## DXF Reader Unit Gaps (acadrust bugs we work around)
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These are fixed in our post-load `fix_dxf_dimension_rotations()` in `src/io/mod.rs`, documented here for reference.
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| Entity | Field | DXF Code | Bug | Fix Location |
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| **Dimension (Linear)** | `rotation` | 50 | Stored in degrees, used as radians | `io/mod.rs::fix_dxf_dimension_rotations()` |
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| **Dimension (all)** | `text_rotation` | 53 | Code 53 never parsed; always 0 | `tessellate.rs::dimension_text_natural_rotation()` |
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| **AttributeEntity** | `rotation` | 50 | No `.to_radians()` in reader | Needs fixup (not yet applied) |
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| **AttributeDefinition** | `rotation` | 50 | No `.to_radians()` in reader | Needs fixup (not yet applied) |
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| **Shape** | `rotation` | 50 | No `.to_radians()` in reader | Shape not currently rendered — low priority |
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---
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## Coverage Summary
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| Subsystem | Coverage |
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| Tessellation | 34/41 entity types fully, 4 legacy fallback, 3 missing |
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| Snap points | 36/41 (Face3D, Solid3D, Region, Body, OLE2Frame missing) |
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| Grip points | 36/41 (same 5 missing) |
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| Properties panel | 36/41 (same 5 missing) |
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| Hit testing | 41/41 (all via fallback) |
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