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Future improvements of Cinolib

Please consider this to be just development notes and not any real planning.

Papers I'd like to implement:

  • Properties of Laplace Operators for Tetrahedral Meshes (SGP2020)
  • A Laplacian for Nonmanifold Triangle Meshes (SGP2020)
  • Polygon Laplacian Made Simple (EG2020)

Tips and Tricks to test/implement

Things to be fixed:

  • Dijkstra is faster with std::priority_queue than with std::set (double check this)
  • use enum classes instead of enums for strong typing and easier code/parameter handling
  • in DrawableSegmentSoup, edge rendering is orientation dependend when cheap mode is not active (cylinders are defined as points + dir!)
  • find ways to speedup updateGL(). For big meshes it's overly slow...
  • transform all NULL into nullptr
  • merge vec2 vec3 (and colors!) into a unified vec<D,T>. This will make much easier write algorithms that scale across multiple dimensions (e.g. Poisson sampling). For the same reason vertex types should become template parameters for meshes
  • provide mechanisms to enable operations between meshes with different template signatures (e.g. export_hexahedra,...)
  • use a less verbose naming for ANSI text colors
  • fix per face winding in midpoint subdivision
  • fix marching tets: degenerate triangles will be generated in some cases (see comments inside cpp file)
  • fix integral curve tracing (also refactor ray/line/plane intersections)
  • gradients on hex-meshes look buggy. Find out why

Extensions/improvements:

  • create a struct IOData that contains vectors for all input mesh elements (verts, polys, textures, normals, labels, colors, ecc), and use it for any IO operation in the lib
  • remove vecs of vecs for mesh polygons and polyhedra. use serialized elements and two separated vectors to index them
  • add line color for 2D checkerboard maps
  • allow to select clamping or repeation for 1D texture
  • implement convertion operators between surface meshes and volume meshes (see http://www.cplusplus.com/doc/tutorial/typecasting/)
  • use parallel for to handle all-vs-all tests in octree leaves
  • splitting rule for octree generation should be passed as an external function, so that each one can make the tree he wants to make....
  • double check vertex non manifoldness checks, they can probably be made much faster exploiting Euler to check the topology of the link....
  • remove vectors of vectors and use serialized indices (with end of list markers, and pointers to base addr for each element). Measure gains before!
  • parsers should return vectors of doubles, not vec3ds
  • it would be better to have vectors of doubles inside the meshes too, and have a vec3d "view" on data to do math
  • use PARALLEL_FOR as much as possible inside the library to boost performances
  • consider computing element quality and normals (at least for faces) on the fly, without precomputing and storing them
  • try to adhere more to data flow/functional programming principles, keeping as few classes as possible with only access to inner data, moving methods that do data processing outside the class
  • consider using SSE instructions (http://www.cs.uu.nl/docs/vakken/magr/2017-2018/files/SIMD%20Tutorial.pdf)
  • use HapPly for .ply IO operations
  • add line queries to Octree
  • consider adding a BVH with SAH policy for efficient NN and Ray intersection queries (see http://www.sci.utah.edu/~wald/Publications/2007/ParallelBVHBuild/fastbuild.pdf for theory and https://github.com/wjakob/instant-meshes/blob/master/src/bvh.h for a great implementation)
  • consider moving to C++17 to exploit parallel STL functionalities (https://www.bfilipek.com/2018/11/parallel-alg-perf.html)
  • adjust examples #1-#6 such that will read multiple meshes from command line input
  • add reader/writer for .MSH files
  • add a "soup" flag to meshes (i.e., no connectivity will be computed)
  • add Lagrange multipliers to linear solvers
  • add copy constructors for meshes
  • add rosy field
  • add constructors to create basic meshes (regular 2D/3D lattices,...)
  • add convenient wraps to do back-substitution directly into linear_solvers.h
  • add support to read/write per element labels in OFF and HEDRA
  • make sure field_serialize is lossless in terms of numeric precision
  • remove headers from serialized vector and scalar fields (it’s far more general)
  • update skeleton data structure (and make relative control panel)
  • SlicedObj should not be a trimesh. Its drawable counterpart should!
  • vec and Color classes should have similar interfaces
  • Add cotan laplacian normalization (ref => https://www.ceremade.dauphine.fr/~peyre/teaching/manifold/tp4.html)
  • Improve on mesh rendering (shaders, VBOs (https://www.khronos.org/opengl/wiki/VBO_-_just_examples))
  • Use robust geometric computations (volumes, dihedral angles ecc.) (ref. => Lecture Notes on Geometric Robustness di Jonathan Richard Shewchuk)
  • add 2D medial axis computation facilities using qgarlib
  • linear blend skinning and dual quaternions

Documentation:

  • make animated GIFs to illustrate examples
  • add a description of all the non standard files used in cinolib (.hedra, scalar and vector fields, sharp features)