VisIt-plugin-compilation.md

+**NOTE**: VisIt version 3.3.x and higher have, by default, installed w-data plugin.
+
+# VisIt in version 3.1.x and lower. 
+
+Download and install [VisIt, version 3.1.x or 2.13.x](https://wci.llnl.gov/simulation/computer-codes/visit/executables).
+
+In order to visualize results produced by the W-SLDA Toolkit, you need to compile the plugin. 
+The plugin must be placed on a system where the VisIt server will be launched.  
+
+[Video tutorial (YouTube)](https://youtu.be/K00h3sMbV-Q) showing how to install VisIt and connect it to a remote machine.  
+
+# Installing W-data plugin on your local system
+
+Follow instructions from this [file](https://gitlab.fizyka.pw.edu.pl/wtools/wdata/-/blob/master/visit-plugin/README.md).  
+
+Below, we provide examples of the compilation process on selected systems. 
+
+## Compiling plugin on [Andes](https://docs.olcf.ornl.gov/systems/andes_user_guide.html)
+```bash
+module load cmake
+
+cd wslda/lib-wdata/
+g++ -O3 -c wdata.c -fPIC
+ar crf libwdata.a wdata.o
+cp libwdata.a visit-plugin/
+
+cd visit-plugin/
+/sw/andes/visit/bin/xml2cmake -v 3.1 -clobber wdata.xml
+rm CMakeCache.txt
+cmake -DCMAKE_BUILD_TYPE:STRING=Debug
+make
+```
+## Compiling plugin on [Daint](https://www.cscs.ch/computers/piz-daint/)
+Before you start compilation **make sure that you can connect without typing password** from `ela.cscs.ch` to `daint101.cscs.ch`:  
+```bash
+[wtools@dell ~]$ ssh ela.cscs.ch 
+Enter passphrase for key '/home/wtools/.ssh/id_ed25519': 
+
+[wtools@ela1 ~]$ ssh daint101.cscs.ch
+
+wtools@daint101:~> 
+
+```  
+If not, use `ssh-keygen` & `ssh-copy-id daint101.cscs.ch`.   
+Next, execute on `daint101.cscs.ch`:  
+```bash
+module load daint-mc
+module load Visit
+
+cd wslda/lib-wdata
+make 
+cp libwdata.a visit-plugin/
+
+cd visit-plugin
+xml2cmake -clobber wdata.xml
+rm CMakeCache.txt 
+cmake -DCMAKE_BUILD_TYPE:STRING=Debug
+make
+```