OneCAD-Draft/changelogs/v2026.40.md

OpenCADStudio - Release v2026.40 / v2026.40.1 (2026-10-05)

Summary: Unified release notes for release week 2026.40. Release v2026.40 was pulled shortly after release and replaced by v2026.40.1. This document merges the complete feature wave—introducing the interactive FIELD evaluation command and dialog, ATTDEF attribute definition workflow parity, a redesigned tabbed Blocks palette with drag-and-drop insertion, DWF/DGN and point cloud underlays, dynamic input control (DYNMODE), script engine upgrades (.scr), TrueType embedded font PDF export, and smooth exponential zoom navigation—along with the hotfixes that triggered the v2026.40.1 replacement (instant GPU layer visibility toggling without CPU re-tessellation, 3D cylinder height input validation, load-time BLOCK/ENDBLK sentinel recovery, and MCP server request lifecycle & cancellation hardening).

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🌟 Notable Release Notes

• Instant Layer Visibility Toggling: Optimized layer show/hide operations to toggle visibility states directly on GPU batches without triggering CPU re-tessellation passes. (Contributed by @HakanSeven12)
• FIELD Evaluation System & Dialog: Introduced the full FIELD command and UI dialog, supporting real-time text/MText field evaluation, table formula integration, block placeholders, attribute fields on insert, and automatic plot-time updates. (Contributed by @ramox81)
• Attribute Definition (ATTDEF) Parity: Added the complete ATTDEF and -ATTDEF dialogs, tag visibility management, entity property grid synchronization, and ribbon block definition integration. (Contributed by @ramox81)
• Blocks Palette Overhaul: Redesigned the Blocks palette with categorized tabs (Current Drawing, Recent, Favorites), insertion scale/rotation options, drag-and-drop canvas insertion, and -INSERT CLI parity. (Contributed by @ramox81)
• MCP Multiscale Pyramidal Tiling Protocol (DeepZoom): Implemented multiscale pyramidal tiling protocol for MCP vision tools (src/app/control/vision.rs, src/mcp.rs), exposing DeepZoom manifests (cad://session/{session_id}/pyramid/manifest.json), on-demand cached multi-resolution PNG/JSON tiles (tile/{level}/{x}/{y}), and tile/pyramid_manifest parameters in ocs_capture to allow vision agents to navigate dense drawings without exceeding token limits. (Contributed by @KarimJerbi)
• Set-of-Marks (SoM) Visual Grounding & Vision ID Stamp: Added high-contrast numbered visual ID badge stamping (draw_som_badge) on entity centroids in viewport captures, bidirectional entity grounding manifests mapping stamps to handles, layers, types, and world coordinates, regional camera framing, and 2-point raster calibration. (Contributed by @KarimJerbi)
• Visual Differential Streaming & Standardized Spatial Metadata: Added pixel-level visual diff engine (compute_visual_diff) with dirty region cropping (diff_mode: crop), WCS CRS alignment (_spatial), and forward/inverse affine coordinate matrices to dramatically reduce vision token consumption. (Contributed by @KarimJerbi)
• Drawing Load Sentinel Recovery: Materialized missing BLOCK and ENDBLK sentinel entities on damaged drawings during document load, preventing crashes and corrupt database states. (Contributed by @KarimJerbi)
• Underlays & Raster Improvements: Native support for attaching DWF and DGN underlays (UNDERLAY), point cloud attachments (POINTCLOUD), image transparency controls, and image frame toggling (IMAGEFRAME). (Contributed by @ramox81)
• PDF TrueType Font Embedding: Enhanced PDF export to embed subset TrueType fonts directly into PDF output, ensuring crisp vector text rendering without font substitution artifacts. (Contributed by @Chrisyeh1983)
• MCP Server Lifecycle Hardening: Enforced accurate time-to-live policies (60 seconds for GUI resources, 1 hour for tools), request cancellation (tasks/cancel), and explicit request/document tracking on GUI capture requests. (Contributed by @KarimJerbi)

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🚀 New Features

Drafting & Commands

• Signed Offset & Live Drag Preview: OFFSET opens with live interactive geometry preview on preselected objects and supports signed typed distance entries. (Contributed by @CiberNin)
• Ribbon Active Command Indicator: Active drafting commands highlight their corresponding buttons on the ribbon interface. (Contributed by @CiberNin)
• Dynamic Input System Variable (DYNMODE): Added the DYNMODE system variable and command for granular toggling of dynamic input modes. (Contributed by @yztink)
• Script File Engine (.scr): Supported standard .scr CAD scripts across single-line, multi-line, and prefixed command syntax. (Contributed by @yztink)
• Fluid Tangent Snapping: Supported continuous tangent snaps across circular arcs and ellipses. (Contributed by @yztink)
• Polyline Self-Intersection Trimming: Added self-intersection snapping and trimming for complex polyline loops. (Contributed by @gianlucafiore)

Navigation & Zoom

• Exponential Zoom & Tool Cursors: Added smooth exponential mouse-wheel zoom, contextual navigation cursors, and proper canvas framing in ZOOM EXTENTS. (Contributed by @mechpanos)
• Zoom Factor Range Extension: Expanded the ZOOMFACTOR upper range limit to 500. (Contributed by @F4brizi and @mechpanos)

MCP & Vision Automation

• Multiscale Pyramidal Tiling (DeepZoom): Implemented multiscale pyramidal tiling protocol (src/app/control/vision.rs, src/mcp.rs), exposing DeepZoom manifests (cad://session/{session_id}/pyramid/manifest.json), on-demand cached multi-resolution PNG/JSON tiles (tile/{level}/{x}/{y}), and tile/pyramid_manifest parameters in ocs_capture. (Contributed by @KarimJerbi)
• Set-of-Marks (SoM) Grounding & Vision ID Stamps: Stamped high-contrast numbered visual ID badges (draw_som_badge) on entity centroids in viewport captures, paired with bidirectional grounding manifests (annotations / visible_entities) mapping tags to handles, layers, types, and world coordinates. (Contributed by @KarimJerbi)
• Visual Differential Streaming & Spatial Metadata: Standardized WCS spatial metadata under _spatial with affine projection matrices and visual differential engine (compute_visual_diff) supporting dirty region cropping (diff_mode: crop). (Contributed by @KarimJerbi)
• 2-Point Image Calibration & Regional Framing: Supported regional camera framing (bounds) and 2-point raster image calibration in embed_image to calculate scale, origin, and world dimensions from pixel-to-world point pairs. (Contributed by @KarimJerbi)
• 4-Pillar Auto-Sync & Declarative Op Table: Implemented 4-pillar auto-sync, dynamic introspection, and declarative MCP request dispatching. (Contributed by @KarimJerbi)
• Text Audit, Spell-Check & Replacement: Added text_audit spell-checking with native OS spellcheckers and dry-run replacement simulation, alongside multiline text_search and text_replace. (Contributed by @KarimJerbi)
• Lifecycle & Cancellation Management: Supported tasks/cancel cancellation handling, public error codes, and schema-sync opt-out. (Contributed by @KarimJerbi)
• Inspector Conformance Probing: Added Inspector CLI conformance tests and descriptor lifetime tracking for newly created GUI elements. (Contributed by @KarimJerbi)

Diagnostics, Localization & CI

• Desktop Crash Diagnostics: Added automated desktop crash logging to capture and persist diagnostic trace logs upon unhandled exceptions. (Contributed by @mechpanos)
• Italian Translation Updates: Standardized CAD terminology throughout the Italian localization (Join, Plot, Layer, Hatch). (Contributed by @abccorsicad)
• Hotfix Release Workflow: Added automated CI support for deploying patch releases (v<year>.<week>.<patch>) on top of weekly releases. (Contributed by @HakanSeven12)

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🐛 Bug Fixes

Geometry, Snapping & Modeling

• 3D Cylinder & Primitive Creation: Respected typed height inputs during cylinder and basic 3D primitive creation. (Contributed by @KarimJerbi)
• Point Snap Node Constraint: Constrained POINT entities to snap exclusively as Node object snaps. (Contributed by @HakanSeven12)
• Hatch Association on Trim: Preserved hatch boundary associations when TRIM splits a boundary curve into multiple segments. (Contributed by @HakanSeven12)
• Polyline Joint Mitering: Mitered joints accurately on wide polyline band corners. (Contributed by @HakanSeven12)
• 3D Solid History Graph: Removed unnecessary history generation on edge fillets/chamfers of plain solids and corrected undo evaluation graphs. (Contributed by @ramox81)
• ACIS Transform Normalization: Eliminated duplicate transforms on center-framed 3D boxes and wedges following ACIS geometry lifts. (Contributed by @ramox81)

UI, Layers & System

• Novel Layer GUI Refresh: Refreshed ribbon layers and the Layer panel immediately when newly created entities register new layers. (Contributed by @yztink)
• Erased Raster Image Placeholders: Cleared placeholder bounding text cleanly when a broken raster image reference is deleted. (Contributed by @mechpanos)
• Windows Printer Properties Freeze: Resolved UI thread lockups during Windows printer properties and DEVMODE size queries. (Contributed by @mechpanos)
• R14 Layer Plot Flags: Corrected layer plot flag parsing on legacy R14 drawings. (Contributed by @YsDirector)
• Chinese Font Hinting (KaiU): Fixed glyph rendering and hinting distortions for KaiU fonts. (Contributed by @Chrisyeh1983)

XREFs, Plotting & Web

• XREF Dimension Anonymous Blocks: Imported missing anonymous blocks referenced by dimension entities across XREF boundaries. (Contributed by @HakanSeven12)
• PDF Export Window Clipping: Correctly clipped and excluded entities falling outside the designated export window during PDF plot. (Contributed by @HakanSeven12)
• Web Build Compilation: Gated native-only desktop code out of the wasm32 build target. (Contributed by @HakanSeven12)
• Save Verification: Verified baked-view consistency in save_verified automation checks. (Contributed by @KarimJerbi)

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👥 Contributors

Huge thanks to all contributors to v2026.40 / v2026.40.1:

• Hakan Seven (@HakanSeven12) — Upstream geometry kernel/codec syncs, instant layer visibility performance, PDF export clipping, XREF anonymous block import, release workflow fixes.
• ramox81 (@ramox81) — FIELD evaluation system, ATTDEF dialogs & parity, Blocks palette, DWF/DGN underlays, point clouds, solid history graph.
• Karim Jerbi (@KarimJerbi) — Multiscale pyramidal tiling protocol (DeepZoom), Set-of-Marks visual ID badge stamping, visual differential streaming, 4-pillar auto-sync & declarative op table, text audit spell-checking, 3D cylinder height enforcement, load-time BLOCK sentinel recovery, MCP server lifecycle & cancellation hardening, save verification.
• yztink (@yztink) — DYNMODE system variable, .scr script engine, fluid tangent arc/ellipse snaps, layer GUI refresh.
• Panos (@mechpanos) — Exponential zoom, ZOOM EXTENTS framing, desktop crash logging, Windows printer freeze fixes.
• Christopher Overbeck (@CiberNin) — Signed offset with live preview, ribbon active command highlighting.
• Chris Yeh (@Chrisyeh1983) — PDF TrueType font subset embedding, KaiU font hinting fixes.
• Gianluca Fiore (@gianlucafiore) — Polyline self-intersection snapping and trimming.
• F4brizi (@F4brizi) — ZOOMFACTOR limit expansion.
• abccorsicad (@abccorsicad) — Italian CAD terminology localizations.
• ysdirector (@YsDirector) — R14 layer plot flag compatibility.