Offsets and Remeshing

This repository contains an implementation of the method presented in "Feature-Preserving Offset Mesh Generation from Topology-Adapted Octrees". It generates offsets for triangle meshes and performs feature aware remeshing.

Dependencies

The code is based on CGAL and was tested with version 5.5.2. For the offsetting library requires slight modification of the Octrees package.

The code requires the following libraries to be installed:

• CGAL the results in the paper were produced with version 5.5.2 with slight modification to the Octrees package.
• GLOG
• CLI11

The Orthree in CGAL needs to be slightly modified:

1. The split() function in Orthtree must be public and all point handling (everything after node.split()) must be deleted.
2. The split() and unsplit() functions in Orthtree/Node.h must be public.

Usage of the CLI

Example input for command line interface voxeloffset_cli.

./build/src/voxeloffset_cli/Voxeloffset_cli -p "../../data/cube.off" -o "out.off" --debugout "debug_folder" -d --d1 10 --d2 12 -r 1 -n -q -j 0.1

Explanation:

• -p primal mesh
• -o output mesh
• --debugout folder for debug output
• --diag set offset radius relative to the bbox diagonal
• -d perform Dual Contouring
• --d0 minimum octree subdivision level (can be 0)
• --d1 maximum octree subdivision level (must be greater than d0)
• --d2 octree subdivision level for removing non-manifold vertices (must be greater than d1)
• -r number of remeshing steps. For not performing remeshing, set this to 0
• --lminfactor multiplier for the minimal edge length
• --lmaxfactor multiplier for the maximal edge length
• -n normalize input mesh to the unit cube
• -j offset radius

To compare against alpha wrapping, one can use the flag --alpha_wrap. The program will then only execute alpha wrapping and write the result to the given output file.

Remeshing only

./build/src/voxeloffset_cli/Voxeloffset_cli -p "../../data/cube.off" --remeshinput "cube_offset.off" -o "out.off" --debugout "debug_folder" -r 1 -q -j 0.1

Explanation:

• -p primal mesh
• --remeshinput offset mesh that should be remeshed
• -o output mesh
• --debugout folder for debug output
• -r number of remeshing steps.
• --lminfactor multiplier for the minimal edge length
• --lmaxfactor multiplier for the maximal edge length