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 # Version 2025 R2

 Last update: 09.03.2026 

**Version 2025 R2 (V252)** introduces several important changes and enhancements across the API, materials, and user interface (UI) components. These updates improve consistency, support new capabilities, and remove deprecated or redundant functionality:

## Custom Tree

- **Dynamic Rebuild Control**: Two new API methods allow you to control tree rebuild behavior for performance enhancement: 
    - **SetCommandCompleteRebuild(false)** prevents automatic tree rebuilding after every command. To revert to automatic rebuilding, use **SetCommandCompleteRebuild(true)**.
    - **RebuildCustomTree()** must be manually called after tree changes (for example: add/delete).
- **Tree Property Enhancements**: Three new **ITreeHierarchy** properties improve custom tree definition: 
    - **Index**: Allows multiple custom trees to be ordered.
    - **GetTreeGroup** and **GetTreeToolTip**: Optional functions to define grouping and tooltips dynamically. Both accept null.

## Materials

- **Material Coordinate System Assignment**
    - **UseLocalCoordinateSystem** and **UseGlobalCoordinateSystem** properties have moved from the **Material** to the **MaterialAssignment** level. This enables the same material to be reused with different orientations across assignments.
- **Beam Material Name Updates**
    - Beam materials now include thickness in their names for uniqueness (for example: S355 → Structural Steel, S355 (10 < t ≤ 16)).
    - Migration support added to ensure older projects reflect the new naming convention.
    - Material matching logic now uses name and source instead of identifier for beam materials, except in local libraries.

## Meshing

- **New Registration Methods**
    - Two new methods were introduced for mesh handling: 
        - **RegisterMesh()**
        - **RegisterFarFieldMesh()**

## Result Variables

- **Renamed and Removed Variables**
    - **ResultLabel** → **ResultSetLabel**
    - **ResultPlotID** → **ResultSetID**
    - **ResultVariable.OperatingPressure** → **ResultVariable.FanPressureRise** (to match documentation)
    - **ResultVariable.LocalReactionForce: Removed**
    - **ResultVariable.ReactionResultant** → **ResultVariable.ReactionForce**These changes improve consistency and better align the API with user-facing documentation and UI.

## Internal Fans

- **Volume-Flow Curve Support**
    - Internal fans now support volume-flow curve definitions in both **Explore** and **Refine stages**.
    - New UI options include: 
        - Definition dropdown
        - Volume flow table
        - Hub and tip radius inputs (used for filtering)
        - Informational display
    - Includes support for local libraries and a default **IcePak** library.
- **Namespace Refactor**
    - Internal fans were moved from the **Conditions** namespace to a new **InternalFans** namespace.

## User Interface

- **UI Refactoring**
    - Several minor UI-related items were moved to the **UserInterface** project to reduce clutter.

## API Clean-Up and Refactoring

- **Notifications Class Consolidation**
    - The **Notifications** class has been removed. Static methods were relocated to the **Notification** class.
- **Code Cleanup**
    - Typos corrected in method names.
    - Removed a faulty property setter to improve stability.
    - Use of the contextual value keyword was enforced for property set accessors.

## SpaceClaim Integration

- **ACIS Export Options**
    - **AcisExportOptions.Version** property was removed. Only V5 remains in AcisVersion, as all other versions are no longer supported.

## API Changes and Incompatibilities

- **Breaking Changes**
    - Removal of **BeamProfileProperties.SurfaceAreaPerLength**
    - Removal of **ResultVariable.LocalReactionForce**
    - Renaming of multiple result variables
    - Reassignment of coordinate system properties
    - Namespace relocation of internal fan support