MercuryDPM includes a paraview plugin to visualise superquadrics. Unfortunately, this requires you to build paraview-suberbuild from scratch. Below you find the installation instructions:

Installation instructions paraview-superbuild with superquadrics plugin

Tested on Xubuntu 16.04.3 LTS (Oracle VM VirtualBox) and Windows 10.1 (Developer mode using the Ubuntu shell

Update apt
$ sudo apt update

# sudo apt upgrade
You need gcc version 6 or higher (type gcc -v to see the version number). If you have an old version, you need to install gcc-6:
$ sudo add-apt-repository ppa:ubuntu-toolchain-r/test

$ sudo apt install gcc-6
You need cmake version 3.10 or higher (type cmake –version). If you have an old version: (https://github.com/ruslo/hunter/issues/328#issuecomment-198672048)
Remove cmake, cmake-curses-gui, cmake-qt-gui, curl
$ sudo apt remove cmake curl

Install necessary packages:
$ sudo apt install zlib1g zlib1g-dev libssl-dev

Download and install curl: https://curl.haxx.se/download.html
$ wget https://curl.haxx.se/download/curl-7.56.1.tar.bz2

$ tar xf curl-7.56.1.tar.bz2

$ cd curl-7.56.1

$ ./configure --with--ssl && make && sudo make install

$ cd .. # you can now remove the folder curl-7.56.1

$ curl --version # check curl is installed

Install qt5
$ sudo apt install qt5-default

$ sudo apt install libncurses5-dev (ccmake command will also be created)

Download and install cmake: https://cmake.org/download
$ wget https://cmake.org/files/v3.10/cmake-3.10.0.tar.gz #Download cmake: https://cmake.org/download

$ tar xf cmake-3.10.0.tar.gz

$ cd cmake-3.10.0

$ ./bootstrap --qt-gui --system-curl && make && sudo make install

$ bash # restart bash such that it doesn't look for cmake in the old location
Get paraview-superbuild
$ sudo apt install git pkg-config #needed to make paraview

$ mkdir ParaViewSuperBuild

$ cd ParaViewSuperBuild

$ git clone --recursive https://gitlab.kitware.com/paraview/paraview-superbuild.git Source

$ cd Source

$ git fetch origin

$ git checkout v5.4.1

$ git submodule update

$ cd ../

Install paraview-superbuild
$ mkdir Build

$ cd Build

$ cmake ../Source -DENABLE_qt5=TRUE ../Source -DENABLE_qt5=TRUE -DENABLE_python=TRUE # use cmake-gui to debug if you encounter errors

$ make && sudo make install #or make -j4 && sudo make install

$ paraview & # check

$ vi ~/ParaViewSuperBuild/Build/superbuild/paraview/build/ParaViewConfig.cmake

Turn PARAVIEW_BUILD_QT_GUI, PARAVIEW_ENABLE_QT_SUPPORT, paraview_build_qt_gui from “ON” to “OFF”, and save.
Download and install SuperquadricTensorGlyph
$ svn co https://svn.mercurydpm.org/SourceCode/Trunk/Tools/SuperquadricTensorGlyphForParaviewSuperBuild SuperquadricTensorGlyph

$ cd SuperquadricTensorGlyph

$ mkdir Build

$ cd Build

$ cmake .. -DParaView_DIR=~/ParaViewSuperBuild/Build/superbuild/paraview/build

$ make
Load plugin
In ParaView, go to Tools > Manage Plugins… Do Load New and select ~/SuperquadricTensorGlyph/Build/libSuperquadricTensorGlyphFilter.so. Click “OK”. Then the filter should appear on the Local plugins list, click on it and select "Auto Load", then close.
Apply plugin
When opening a *.vtu file with superquadric features, do "Apply" then go to Filters > Tensor Analysis > Superquadric Tensor Glyphs. Finally, do "Apply" again.

On MacOS

On a Mac operating system I got that far:

install the dependencies
cmake the superbuild: ccmake ../paraview-superbuild/ -DCMAKE_OSX_SDK=macosx10.15 -DENABLE_qt5=TRUE -DENABLE_python=TRUE -DENABLE_python3=TRUE
fix one error: https://stackoverflow.com/questions/59075526/error-qualified-reference-to-qfixed-is-a-constructor-name-rather-than-a-type
This leaves me with a lot of errors when building qt5, though. This suggests I need the developers libraries of qt5, however, I could not make sense of it https://forum.qt.io/topic/109634/qt-cross-compilation-qith-paraview-the-opengl-functionality-tests-failed
here the original install instructions: https://gitlab.kitware.com/paraview/paraview-superbuild/-/blob/master/README.md