Release v3.0.9.196

Import & Export Enhancements

3MF Export

MeshLib now supports 3MF export on a per-model basis.
Full multi-object scene export to 3MF is on our roadmap.

Technical capabilities:

• Exports a single ObjectMesh at a time to 3MF

• Preserves:

  • Face colors

  • Vertex colors

  • Solid (object-level) colors

  • Length units (properly serialized and restored)

  • Transforms applied to the model

• Handles meshes with deleted vertices without producing corrupted 3MF output

Import improvements:

• Correct handling of BackColor transparency

• Correct BaseMaterial interpretation

• Reliable parsing of transformations

• Proper loading of per-face/vertex color maps

• Imports respect internal model units and convert to user-selected units

This upgrade makes 3MF a robust choice for single-object interchange with CAD/Additive Manufacturing software.

GeoTIFF Export (Distance Maps + Transform Support)

New support for exporting distance maps as GeoTIFF with optional transformation.

The exporter automatically includes GDAL_NODATA where appropriate.

New Tutorial: Creating an Advanced Tool Based on MeshLib SDK

A new in-depth engineering guide is now available:

Building a Support Generator Plugin Using MeshLib C++ on Windows
https://meshlib.io/documentation/SupportGeneratorTutorial.html

Topics covered:

• Plugin architecture and recommended project layout

• Working with MeshLib data structures

• Implementing custom processing pipelines

This is intended as a blueprint for developing MeshLib extensions.

Python 3.14 Support

MeshLib now builds and publishes wheels for Python 3.14.

New Python Function: Full Attribute Preservation

projectObjectMeshData now supports complete attribute round-tripping, including:

• FaceColors

• VertColors

• UVCoords

• PerFaceTexture

• All mesh attribute channels supported by the C++ core

This enables developers to write Python processing pipelines that preserve visual and semantic mesh data, not just topology and geometry.

MeshViewer Updates

ImGui / UI Upgrades

• Upgraded to ImGui 1.92

• Removal of obsolete calls

• Fixes to notification panel, separators, scroll regions

• Font scaling and color theme adjustments for improved readability

Scene Tree / Viewer Panels

• Deterministic group collapse behavior

• More predictable selection state

• Scrollbar correction in hierarchical views

Interaction / Input Subsystem

• Fixed Magic Mouse delta handling on macOS

Geometry Interaction

• Added interpolation mode for picked-point normals

• Fixed pick behavior in SurfaceManipulationWidget

• Added AncillaryPlane helper class for tool development

Platform & Integration

• Added XDG Desktop Portal support for native Linux file dialogs

• Internal header and dependency cleanups:

  • MRImGui.h, MRPch.h, MRUIStyle.h

  • Build-time improvements in MRViewer.h

These updates improve embedding MeshViewer into OEM applications and custom toolchains.