# Installation of meshalyzer

Meshalyzer is regularly used on Linux and Mac machines. It has worked under Windows as well.

## Prerequisities

1. [libpng](http://libpng.org)
2. [OpenMP](http://openmp.org) is recommended too improve certain operations. For all compilers, except *clang* supplied by Apple, it is standard. A simple way to include it on Apple machines is with homebrew:
    `brew install libomp`
2. [FLTK 1.3.x](http://www.fltk.org/) or higher. Manually downloadad and installed is better since the prepackaged versions often have issues with fltk-config.
3. [glew](http://glew.sourceforge.net) for Linux and Windows only.
2. [glut](https://www.opengl.org/resources/libraries/glut/) for Linux and Windows only.
3. [cmake](https://cmake.org) if you want to make compiling easier.
3. <strike>To make the "windowless" rendering version, [OSMesa](https://www.mesa3d.org/osmesa.html)</strike>
4. To read in VTK/VTU format meshes, install [VTK](https://www.vtk.org/) development files

Except for fltk, using your package manager is recommended for installing these packages if possible. On *MacOS*, [homebrew](https://brew.sh/) works for us.

## Compiling

Clone the repository and enter the codebase folder `meshalyzer`.
```
git clone https://git.opencarp.org/openCARP/meshalyzer.git
cd meshalyzer
```

We provide Makefiles and CMake files for compiling the code, choose the one that fits your workflow.

### Makefile

1. If VTK is installed, edit the **make.conf** to set the `VTK_INC` and `VTK_DIR` variables to point to the directories containing the VTK header files and libraries, respectively. Comment them out otherwise.

2. If you have an Apple machine, edit **make.conf** to make sure that
   *HAVE_RETINA* is correct.
   
3. Type `make -j`

4. <strike>For the windowless version, type `make mesalyzer`</strike>

5. The compiled executables will be found in the directory.

6. Copy the binaries to a suitable location

### CMake

1. We suggest to run CMake by out-of-source builds, which means all the compiled code goes into a `_build` directory separate to the source code.

2. If VTK is installed, type `cmake -S. -B_build`. Otherwise type `cmake -S. -B_build -DUSE_VTK=OFF`

3. Compile the code via `cmake --build _build`

4. In the main meshalyzer directory, you will find a link to the compiled executalbe.

### ccmake

For those who are familiar with [ccmake](https://cmake.org/cmake/help/v3.0/manual/ccmake.1.html):

1. `ccmake .`
 
2. configure, edit and generate

3. make -j

## Documentation

To compile the manual (LaTeX required)

1. `cd manual`
2. `pdflatex manual`
3. `pdflatex manual`

## MacOS

First of all, the [command line tools](https://developer.apple.com/download/more/?=command%20line%20tools) or [Xcode](https://developer.apple.com/xcode/) must be installed.
Next, install the [prerequisities](#prerequisities) using your package manager. We use [homebrew](https://brew.sh/) as an example.

```
brew install libpng
brew install fltk
brew install git
brew install cmake
```

Follow the steps in the [Compiling](#compiling) to build the code.

## Ubuntu/Debian:

For installing meshalyzer first you need to install the ["Prerequisites"](#prerequisities). In Ubuntu you can use:

```
apt-get update && apt-get install -y --no-install-recommends \
    ca-certificates \
    fluid \
    freeglut3-dev \
    g++ \
    git \
    libfltk1.3-dev \
    libglew-dev \
    libglu1-mesa-dev \
    libpng-dev \
    make
```

Follow the steps in [Compiling](#compiling) to build the code.

## Post-compilation

You can execute meshalyzer by typing `./meshalyzer`

See README.md for an example.

To make meshalyzer available from anywhere on your machine, you need to copy it to your *bin* directory, or
add the meshalyzer directory to **PATH** by editing your *.bashrc* (or *.bash_profile*). 
Using the nano editor as an example, type the following command into the terminal:

```
nano ~/.bashrc
```

This will open an editor, scroll all the way down and add the following line, replacing '/home/somefolder/anotherfolder/meshalyzer' with the path of your meshalyzer folder:

```
export PATH=$PATH:/home/somefolder/anotherfolder/meshalyzer
```

press Control+X, then type Y and Enter to save the changes. Close all terminal instances!

open a terminal and type `meshalyzer`