Seeder Mesh Generator

The goal of Seeder is simple: create an octree mesh out of a given geometry. Typically the given geometry is given in the form of STL-files. As simple as this goal is the basic idea for the construction of this mesh. The user has to define at least the basic mesh information to generate the most simplest mesh, fully periodic cube without any geometries. Basic mesh information are bounding cube, minlevel and folder. Bounding cube is the root node of the octree, defining the complete universe, from which all element are derived by recursive bisection, global minlevel is the minimum refinement in the fluid domain and folder is the location to dump the mesh output in treelm format.

The user can also define a set of geometries, that should describe certain aspects in the mesh. Most importantly the boundaries of the computational domain. Those have to consist of some supported geometric primitives, right now the following primitives are available:

• Points
• Lines
• Triangles
• Boxes
• Spheres
• Cylinders

Additionally some combining objects like Planes and STL-files can be used. They are automatically translated to these primitives.

Transformations like translation, scaling, reflection and rotation can be applied to all geometric primitives.

Finally, those geometric definitions, have to be given one of the attributes. Attributes are defined by their kind:

• Boundary
• Seed
• Refinement

a level, that describes the minimal refinement level by which the object should be resolved and some kind specific further values, like a label for the boundary conditions.

For further details see the FORD generated documentation.

Included Software

Note, that this source code includes some other software parts to your convenience.

• Treelm is the central library providing the octree infrastructure. It is available under the terms of the BSD License.
• Aotus is used for configuration and header files. It is released under the terms of the MIT License as the Lua library, that it includes.
• Waf is used as the build system and is released under the terms of the BSD license.
• CoCo is used to preprocess Fortran source files and is released under the terms of the GPLv2.
• For the intersection check of triangles with axis aligned boxes we make use of the code developed by Tomas Akenine-Möller, available at the Lunds Universitet

License

Seeder is licensed under the terms of the 2-clause BSD license reproduced below. This means that Seeder is free software and can be used, reproduced, modified, distributed and redistributed also for commercial purposes under the conditions of the BSD license. The only requirement is that some credit to the authors is given by putting this copyright notice somewhere in your project.

According to good scientific practice, publications on results achieved in whole or in part due to Seeder should cite at least one paper presenting the Seeder software.

An appropriate reference could be:

@incollection{harlacher_seeder12,
   author = {Harlacher, Daniel F. and Hasert, Manuel and Klimach, Harald and Zimny, Simon and Roller, Sabine},
   affiliation = {German Research School for Simulation Sciences GmbH, and RWTH, Aachen, Germany},
   title = {Tree Based Voxelization of STL {Data}},
   booktitle = {High Performance Computing on Vector Systems 2011},
   editor = {Resch, Michael and Wang, Xin and Bez, Wolfgang and Focht, Erich and Kobayashi, Hiroaki and Roller, Sabine},
   publisher = {Springer Berlin Heidelberg},
   pages = {81-92},
   year = {2012}
}

Copyright (C) 2011-2013 German Research School for Simulation Sciences GmbH, Aachen. Copyright (C) 2013-2019 University of Siegen. All rights reserved.

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