dhaumont/visilib

The visilib project aims to provide an efficient and robust C++ library for exact visibility computation in 3D.

visilib's Issues

Crashes in demo

Demo crashes after scene changes.

Steps to reproduce:

1. run visiblibDemo
2. press 'x' seven times

Result:

Overflow detected: more than 200 recursive calls....
visilibDemo: /home/user/dev/foss/visilib/demo/../visilib/visibility_aperture_finder.h:104: visilib::VisibilityResult visilib::VisibilityApertureFinder<P, S>::resolveInternal(visilib::PluckerPolytope<P>*, const string&, const std::vector<visilib::Silhouette*>&, const std::vector<_Tp>&, int) [with P = visilib::MathPlucker6<double>; S = double; std::string = std::__cxx11::basic_string<char>]: Assertion `0' failed.
Aborted (core dumped)

System:

$ g++ --version
g++ (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0

LEDA is unavailable

First of all, thanks for sharing this amazing piece of software. But I'm having problems compiling with exact arithmetic support because LEDA library is not available anymore.

The website at http://www.algorithmic-solutions.info/free/d5.php says

LEDA FREE EDITION IS NO LONGER DISTRIBUTED!

Is there any workaround for this? I can build and run the demo without exact arithmetic support though.

Occlusion errors in the second demo scene

Platform:
Win10, Visual Studio 2022, x64 build (debug and release), without exact arithmetic libraries

To reproduce:
Launch visilibDemo.exe, press X to skip to the second demo: Two triangles and a large mesh.
The initial view is correct. Press "Space" to enable animation. I'm observing three cases:

• correct case where stablines only pass through the empty space
• inverse case where stablines pass only though the occluding polygon
• stablines pass through both the empty space and the occluding polygon

Is that a bug, or a side-effect of non-exact arithmetic?

License question

Thanks for making Visilib available as open source and for all your work.

I am interested in calling Visilib from my program. While my program is open source, it is not GPL, and so it is not compatible with Visilib.

From what I can see so far, there are very few object-space 3D visibility libraries available -- do you know of any others?

I know Visilib uses CGAL (parts are GPL only, other parts are more permissive) and some other dependencies that may make changing licenses impossible. However, if it is possible, I would encourage you to consider that changing Visilib's license to LGPL would allow its use by more projects (open source and otherwise).

python bindings

Hi
are there python bindings for this library?