# Welcome To The Visualization Toolkit

- Copyright Notice
- Introduction
- Documentation
- Installation
  - Unix Installation
  - PC Installation
- Execution
- Common Problems
- Adding A New Class
- Adding a New Toolkit

# Copyright Notice

Copyright (c) 1993-1998 Ken Martin, Will Schroeder, Bill Lorensen.

This software is copyrighted by Ken Martin, Will Schroeder and Bill Lorensen. The following terms apply to all files associated with the software unless explicitly disclaimed in individual files. This copyright specifically does not apply to the related textbook "The Visualization Toolkit" ISBN 013199837-4 published by Prentice Hall which is covered by its own copyright.

The authors hereby grant permission to use, copy, and distribute this software and its documentation for any purpose, provided that existing copyright notices are retained in all copies and that this notice is included verbatim in any distributions. Additionally, the authors grant permission to modify this software and its documentation for any purpose, provided that such modifications are not distributed without the explicit consent of the authors and that existing copyright notices are retained in all copies. Some of the algorithms implemented by this software are patented, observe all applicable patent law.

IN NO EVENT SHALL THE AUTHORS OR DISTRIBUTORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS SOFTWARE, ITS DOCUMENTATION, OR ANY DERIVATIVES THEREOF, EVEN IF THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

# Introduction

"The Visualization Toolkit, an Object-Oriented Approach to 3D Graphics" is the title of a new book published by Prentice Hall (ISBN 013199837-4).

This is version 2.2. In this release there have been many bugs fixed and a number of new classes. Depending on when you get this, there may be more recent versions out. For more information and a FAQ see our web page at http://www.kitware.com

# Documentation

The ideal way to learn about the software is from the book it is designed to support. You should be able to get the book from any local bookstore or from our web page. The web page also contains some html reference pages for the objects in vtk as well as a FAQ.

      The Visualization Toolkit, An Object-Oriented Approach to 3D Graphics
      by Will Schroeder, Ken Martin and Bill Lorensen.
      Prentice Hall, Second Edition

# Installation

The Visualization Toolkit can be built on both Unix and PC (Win95, WinNT) systems.

### Unix Installation

The following instructions only apply to UNIX systems. The windows source distribution will be released in a different file.

First we will give you the quick and dirty way to build vtk. If you have OpenGL, XGL (with header files), or Starbase do the following:

If you will be using C++ as your development language:

      1) untar the src files
      2) untar the data files
      3) cd vtk
      4) ./configure
      5) read and edit user.make
      6) make

If you will be using tcl in addition to C++:

      1) untar the src files
      2) untar the data files
      3) cd vtk
      4) obtain and build Tcl/Tk if you don't already have it
      5) ./configure --with-tcl
      6) read and edit user.make
      7) make

It is a very good idea to tell configure what C and C++ compilers you will be using. This can avoid many build problems. On most systems you can pass this information to configure in the following way:

    env CXX=/your/C++/compiler CC=/your/c/compiler ./configure

otherwise you must set CXX and CC in your environment and then run configure.

This release has some java support, you can use --with-java but I think it only works on Sun Solaris and Windows. But feel free to experiment.

If you do not have OpenGL, Starbase or XGL the you will need to get and compile Mesa, a wonderful free version of OpenGL. You will need to add --with-mesa to your configure line. If you want to try building shared libraries you can use the --with-shared option also.

Now here is the slightly more detailed version.

This software uses scripts generated by GNU autoconfigure to build itself. There are a couple of options in building the software that you need to decide on. First you need to decide if you are going to use the Mesa rendering library developed by Brian Paul. This is a software renderer that vtk can use on Xwindows based workstations. If your workstation doesn't support Starbase, XGL, OpenGL or GL then you will need Mesa because you have no other choice :-) If you want to build the vtk interpreter then you will need to have Tcl7.4 and Tk4.0 or greater.

Look to http://www.scriptics.com/ for information about getting Tcl and Tk. To obtain a copy of Mesa, written by Brian Paul, you can visit http://www.ssec.wisc.edu/~brianp/Mesa.html.

To build vtk in the distribution directory just type ./configure You can specify --with-tcl and/or --with-mesa on the command line if you would like to use those packages as well. Building vtk for multiple architectures will be discussed later.

To build the vtk library and the tcl bindings and use mesa you would specify

    ./configure --with-tcl --with-mesa

The command:

    ./configure --help

gives some brief help for the command line arguments. If you are using gmake then you might want to consider the --srcdir option.

The next step is to modify the user.make file. If you are using tcl/tk you must specify the full path to find the include files and libraries. If you are using mesa you must do the same. You might also want to specify the compiler flags. We recommend compiling without debug information and with optimizations. The debug information can quadruple the executable size. If you are going to be working with the C++ library you might want to look into using shared libraries. We use them in our development I just didn't figure out a good way to use them with the GNU autoconfigure stuff. So you might want to look into modifying the generated Makefiles and user.make to generate shared libraries. On most machines these days it's not too difficult.

Once this is done you can type make (or gmake if you have it) and it should compile :-)

If you are planning to build vtk for multiple architectures then you can either make a copy of the entire vtk tree for each architecture and then follow the instructions above. Or if you have gmake, you can have one copy of the vtk tree and compile it in a different manner. Instead of running configure from the vtk directory, create a new directory where you have some free disk space (not in the vtk tree), a possible name would be vtk-solaris. cd into this directory and then run configure similar to the following example:

    ls /home/joe_user
        vtk vtk-solaris vtk-sgi

    cd vtk-solaris
    /home/joe_user/vtk/configure --with-tcl

This will create makefiles in the vtk-solaris directory. Then you can run gmake in vtk-solaris to compile vtk. Repeate this process for each architecture you wish to build.

### PC Installation

The PC build process requires running a program to build dependencies and makefiles. Then you use the compiler make utility to compile as follows.

        1. Install vtk2.1 distribution by unzipping in appropriate directory.

        2. Execute vtk\pcmaker\Debug\pcmaker.exe. This will pop-up a little
           GUI that allows you to tailor the build. It then starts
           building makefiles and dependencies. It will run for a couple
           minutes depending on your system. You'll have to tell pcamaker
           where you've placed your vtk source code, and where to build
           the object code and dll's (we'll call it "vtkbin").

        3. When pcmaker completes, start up a MS-DOS shell window
           and change directories to vtkbin\vtkdll. Then run
           "nmake" (Microsft compiler) or "" (Borland compiler).
           This will compile for a LONG time. When it's done, you'll
           have a vtkdll.dll file in vtkbin\vtkdll\obj.
           You can then move this file into the appropriate system
           directory (on Win95: Windows\System; on NT: WinNT\system).

        4. If you want to use Tcl/Tk on your PC, repeat step 3 above
           except work in directory vtkbin\vtktcl to create
           vtkbin\vtktcl\vtktcl.dll. Remember to move this file into your
           system area. (You'll also have to have Tcl (e.g., Wish)
           installed.)

        5. You can then link against vtkdll.dll (C++); or run Tcl
           (wish). If you're running Tcl, make sure you start by
           dynamically loading the vtktcl libraries with the command
           "load vtktcl".

        6. Enjoy.

We recommend a 250MByte minimum swap size or you'll have trouble during the link phase.

# Execution

Many of the examples require the data found in vtk2.0data.tar.gz. This should be uncompressed and un-tarred so that there is a data directory in the vtk2.1 directory. The examples that require data look for it in ../../data. If you compiled with the --srcdir option you may need to create a symbolic link to the data directory.

To run the cc examples just type their name. To run the tcl examples, (assuming that you built the tcl stuff) type

    ../../tcl/vtk mace.tcl

# Common Problems

I got a "warning: no configuration information is in tcl" from configure. This is correct and is supposed to happen.

# Adding A New Class

    1) create the .cxx and .h file for the new class in one of the existing
       directories.
    2) edit Makefile.in for that directory and follow the instructions in
       there. You will need to add the class in only one place.
    3) you will need to rerun configure
    4) then make (or gmake)

# Adding A New Toolkit

The short answer is don't do this, its messy. The best thing to do is use the contrib directory which was designed for people to put their own classes into. The contrib directory is misnamed since we often put contributed classes into other directories. Think of contrib as a development directory for you that happens to include a couple files to serve as an example for the Makefile.in