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Name qhull, rbox 2015.2 2016/01/18 Convex hull, Delaunay triangulation, Voronoi diagrams, Halfspace intersection Documentation: html/index.htm <http://www.qhull.org/html> Available from: <http://www.qhull.org> <http://www.qhull.org/download> <http://github.com/qhull/qhull> (git@github.com:qhull/qhull.git) News and a paper: <http://www.qhull.org/news> <http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.117.405> Version 1 (simplicial only): <http://www.qhull.org/download/qhull-1.0.tar.gz> Purpose Qhull is a general dimension convex hull program that reads a set of points from stdin, and outputs the smallest convex set that contains the points to stdout. It also generates Delaunay triangulations, Voronoi diagrams, furthest-site Voronoi diagrams, and halfspace intersections about a point. Rbox is a useful tool in generating input for Qhull; it generates hypercubes, diamonds, cones, circles, simplices, spirals, lattices, and random points. Qhull produces graphical output for Geomview. This helps with understanding the output. <http://www.geomview.org> Environment requirements Qhull and rbox should run on all 32-bit and 64-bit computers. Use an ANSI C or C++ compiler to compile the program. The software is self-contained. It comes with examples and test scripts. Qhull's C++ interface uses the STL. The C++ test program uses QTestLib from the Qt Framework. Qhull's C++ interface may change without notice. Eventually, it will move into the qhull shared library. Qhull is copyrighted software. Please read COPYING.txt and REGISTER.txt before using or distributing Qhull. To cite Qhull, please use Barber, C.B., Dobkin, D.P., and Huhdanpaa, H.T., "The Quickhull algorithm for convex hulls," ACM Trans. on Mathematical Software, 22(4):469-483, Dec 1996, http://www.qhull.org. To modify Qhull, particularly the C++ interface Qhull is on GitHub (http://github.com/qhull/qhull, git@github.com:qhull/qhull.git) For internal documentation, see html/qh-code.htm To install Qhull Qhull is precompiled for Windows 32-bit, otherwise it needs compilation. Qhull includes Makefiles for gcc and other targets, CMakeLists.txt for CMake, .sln/.vcproj/.vcxproj files for Microsoft Visual Studio, and .pro files for Qt Creator. It compiles under Windows with mingw. Install and build instructions follow. See the end of this document for a list of distributed files. ----------------- Installing Qhull on Windows 10, 8, 7 (32- or 64-bit), Windows XP, and Windows NT The zip file contains rbox.exe, qhull.exe, qconvex.exe, qdelaunay.exe, qhalf.exe, qvoronoi.exe, testqset.exe, user_eg*.exe, documentation files, and source files. Qhull.exe and user-eg3.exe are compiled with the reentrant library while the other executables use the non-reentrant library. To install Qhull: - Unzip the files into a directory (e.g., named 'qhull') - Click on QHULL-GO or open a command window into Qhull's bin directory. - Test with 'rbox D4 | qhull' To uninstall Qhull - Delete the qhull directory To learn about Qhull: - Execute 'qconvex' for a synopsis and examples. - Execute 'rbox 10 | qconvex' to compute the convex hull of 10 random points. - Execute 'rbox 10 | qconvex i TO file' to write results to 'file'. - Browse the documentation: qhull\html\index.htm - If an error occurs, Windows sends the error to stdout instead of stderr. Use 'TO xxx' to send normal output to xxx To improve the command window - Double-click the window bar to increase the size of the window - Right-click the window bar - Select Properties - Check QuickEdit Mode Select text with right-click or Enter Paste text with right-click - Change Font to Lucinda Console - Change Layout to Screen Buffer Height 999, Window Size Height 55 - Change Colors to Screen Background White, Screen Text Black - Click OK - Select 'Modify shortcut that started this window', then OK If you use qhull a lot, install a bash shell such as MSYS (www.mingw.org/wiki/msys), Road Bash (www.qhull.org/bash), or Cygwin (www.cygwin.com). ----------------- Installing Qhull on Unix with gcc To build Qhull, static libraries, shared library, and C++ interface - Download and extract Qhull (either GitHub, .tgz file, or .zip file) - make - export LD_LIBRARY_PATH=$PWD/lib:$LD_LIBRARY_PATH The Makefiles may be edited for other compilers. If 'testqset' exits with an error, qhull is broken A simple Makefile for Qhull is in src/libqhull and src/libqhull_r. To build the Qhull executables and libqhullstatic - Extract Qhull from qhull...tgz or qhull...zip - cd src/libqhull_r # cd src/libqhull - make ----------------- Installing Qhull with CMake 2.6 or later See CMakeLists.txt for examples and further build instructions To build Qhull, static libraries, shared library, and C++ interface - Download and extract Qhull (either GitHub, .tgz file, or .zip file) - cd build - cmake --help # List build generators - make -G "<generator>" .. && cmake .. - cmake .. - make - make install The ".." is important. It refers to the parent directory (i.e., qhull/) On Windows, CMake installs to C:/Program Files/qhull. 64-bit generators have a "Win64" tag. If creating a qhull package, please include a pkg-config file based on build/qhull*.pc.in If cmake fails with "No CMAKE_C_COMPILER could be found" - cmake was not able to find the build environment specified by -G "..." ----------------- Installing Qhull with Qt To build Qhull, including its C++ test (qhulltest) - Download and extract Qhull (either GitHub, .tgz file, or .zip file) - Load src/qhull-all.pro into QtCreator - Build ------------------- Working with Qhull's C++ interface See html/qh-code.htm#cpp for calling Qhull from C++ programs See html/qh-code.htm#reentrant for converting from Qhull-2012 Examples of using the C++ interface user_eg3_r.cpp qhulltest/*_test.cpp Qhull's C++ interface is likely to change. Stay current with GitHub. To clone Qhull's next branch from http://github.com/qhull/qhull git init git clone git@github.com:qhull/qhull.git cd qhull git checkout next ... git pull origin next Compile qhullcpp and libqhullstatic_r with the same compiler. Both libraries use the C routines setjmp() and longjmp() for error handling. They must be compiled with the same compiler. ------------------- Calling Qhull from C programs See html/qh-code.htm#library for calling Qhull from C programs See html/qh-code.htm#reentrant for converting from Qhull-2012 Warning: You will need to understand Qhull's data structures and read the code. Most users will find it easier to call Qhull as an external command. The new, reentrant 'C' code (src/libqhull_r), passes a pointer to qhT to most Qhull routines. This allows multiple instances of Qhull to run at the same time. It simplifies the C++ interface. The non-reentrant 'C' code (src/libqhull) looks unusual. It refers to Qhull's global data structure, qhT, through a 'qh' macro (e.g., 'qh ferr'). This allows the same code to use static memory or heap memory. If qh_QHpointer is defined, qh_qh is a pointer to an allocated qhT; otherwise qh_qh is a global static data structure of type qhT. ------------------ Compiling Qhull with Microsoft Visual C++ To compile 32-bit Qhull with Microsoft Visual C++ 2010 and later - Download and extract Qhull (either GitHub, .tgz file, or .zip file) - Load solution build/qhull-32.sln - Build target 'Win32' - Project qhulltest requires Qt for DevStudio (http://www.qt.io) Set the QTDIR environment variable to your Qt directory (e.g., c:/qt/5.2.0/5.2.0/msvc2012)