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Release Notes 1.4.0

Updates and improvements to UModeler X.

1.4.0f2 (2026-09-23)

  • Improvements
    • General
      • Improved the cleanup of save data.
        • Increased the mesh information displayed in the Cleaner, making it easier to check the state of assets.
        • Improved the Cleaner so that it also inspects data of deleted Scenes and Prefabs.
        • Right-clicking an asset in the UModeler data folder allows you to check which Scene, Prefab, or object the asset is being used in.
      • Improved the tracking and release lifetime management of GPU buffers.
        • Supplemented buffer lifetime handling so that GPU resources are managed more stably.
      • Cleaned up the internal handling of Preferences.
        • Removed unused fields and cleaned up unnecessary log output.
      • Changed the name of the Element Overlay display shortcut.
        • Changed Toggle Display Edge Overlay to Switch Display Element Overlay.
  • Bug Fixes
    • General
      • Fixed an issue where two objects shared data when a duplicated object was undone/redone.
      • Added a recovery routine so that projects already affected by the save data issue can be restored.
      • Fixed an issue where the Lightmap UV was not maintained correctly when saving a mesh with a Smoothing Group applied, which could make textures appear broken.
      • Fixed an issue where the Inspector was not refreshed when performing Undo/Redo after duplicating an object.
      • Fixed a bug that occurred when executing Undo consecutively.
      • Fixed an issue where a system warning sound occurred when using Alt + character shortcut combinations on Windows.
    • Modeling Mode
      • Fixed an issue where copying or duplicating a UModeler X object caused it to be incorrectly linked to the original or another copy, so that modifying one object could affect another.
      • Fixed an issue where inner Faces could not be selected on some complex meshes.
      • Fixed an issue where the Element Overlay could be displayed misaligned with the actual mesh position when multiple objects were selected.
    • Rigging Mode
      • Fixed an issue where the Exclude option of Auto Weight was applied only to the first Bone when applied to multiple Bones at once.
      • Fixed an issue where the Exclude state display did not match the state of the actually selected Bones when multiple Bones were selected.
    • Painting Mode
      • Fixed an issue where objects were abnormally shrunk when entering Painting Mode.
      • Fixed an issue where PaintData returned to a Dirty state immediately after saving Texture Painting data, causing repeated saving and reimporting.
      • Fixed an issue where Channel Assets could be unnecessarily duplicated during the Texture Painting save process.
    • UV Editor
      • Fixed an issue where the Material could revert to its previous state when editing UVs or saving the Scene after applying a new Material.

1.4.0f1 (2026-09-18)

  • Bug Fixes
    • Modeling Mode
      • Burst Acceleration
        • Fixed an issue where elements could not be selected immediately after execution in some tools.
        • Fixed an issue where picking coordinates were vertically inverted in some tools, causing incorrect selection.

1.4.0 (2026-09-16)

  • New Features
    • Burst Acceleration
      • Introduced Burst compiler-based acceleration for core routines such as mesh building, overlay rendering, element selection, snapping, and transforms.
      • Overall responsiveness when editing heavy meshes and scene loading speed have become faster.
      • The acceleration requires Unity's Burst and Mathematics packages.
        • If the packages are missing, a notification (turtle) button is displayed in the Scene View toolbar, and clicking it provides guidance on the cause along with the option to proceed with installation.
        • Even without the packages, everything operates normally through the existing path, so there are no functional restrictions.
      • It can be turned on and off in Preferences > UModeler X > Performance > Burst Acceleration.
    • CPU BVH Picking
      • Changed hover and click picking of faces, vertices, and edges to be handled by CPU BVH instead of GPU ID rendering.
    • Procedural Overlay
      • Switched the vertex, edge, face, and UV overlays to a direct GPU buffer generation path, and improved them to upload only the changed sections partially.
    • Parametric Shape ??Rock Added
      • Added an Icosphere-based procedural rock shape.
      • Supports 3-layer Noise, asymmetry/stretch/compression, Facet, Ridge, bottom flattening and burial, Flat Shading, Vertex Mask, Preview/Bake, and dedicated collider generation.
      • Provides presets (river, boulder, flat, vertical, lowpoly).
      • It can be created as rock (alias boulder) in MCP and AI Shape Script (DSL).
  • Improvements
    • General
      • Overlay Toolbar
        • Apply Animation Button
          • Added an Anim button to the Scene View overlay toolbar, allowing Apply Animation to be toggled on and off directly even in Rigging Mode.
          • It is displayed only on objects that have rigging data and bone weights.
      • Improved the performance of scene loading, mesh building, bulk selection (Isolate, Rect selection, and the like), and the UV picking path.
      • Added transition handling to hand over ownership of the notice feature to the UModeler Mini Hub.
        • If a Mini Hub that supports notices is installed, the Mini Hub takes charge of notices; otherwise, it operates the same as before.
      • Adjusted the default Recent Tools settings of the Scene toolbar and the UV Editor.
    • UV Editor
      • Improved UV Face Color to maintain a minimum transparency even when multiple layers overlap, so that textures are not obscured.
  • Bug Fixes
    • General
      • Fixed an issue where an error (ArgumentOutOfRangeException) occurred immediately after an edit that reduced the vertex count.
      • Fixed an issue where the vertical spacing of the Scene View favorite icons was excessively narrow.
    • Rigging Mode
      • Fixed an issue where the rotation direction of the opposite bone did not match when rotating a Symmetry bone.
      • Unified the mirror axis for Symmetry bone creation and automatic left/right naming to the model's local X axis.
      • Fixed an issue where the overlay remained at the previous coordinates when undoing/redoing after applying Apply Animation.
      • Fixed an issue where the picking target was not refreshed while in the Apply Animation state.
      • Fixed an issue where Apply Animation was not applied according to the Modeling Mode.
      • Fixed an issue where the model disappeared from the screen or normals were not refreshed immediately after UModelerize.
    • Parametric Mode
      • Fixed an issue where the parametric mesh was not refreshed in certain environments.
    • PicoBerry
      • Fixed an issue where the Ultra Mode toggle of Meshy 7 was not displayed, and multi-view attachments were sent as single view.
      • Fixed an issue where the Asset Library window did not open after script recompilation.
      • Fixed an issue where the shape of toggles within the form was misaligned with other items, and the estimate was not refreshed even when the value was changed.
Release Notes 1.4.0 | UModeler X