Harald Reingruber

Web Name: Harald Reingruber

WebSite: http://www.h-reingruber.at





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Harald Reingruber

Visual Computing Expert and Software Crafter (Unity3D/C#/C++/JavaScript)

Name:Harald Reingruber Date of birth:May 29, 1985 Address:Scharnstein, Upper Austria, Austria Email:harald.reingruber@gmail.com Website:https://dev.to/Harald3DCV

Areas of Expertise

Professional:Augmented realityReal-time GraphicsInformation visualizationVolume renderingImage processing, medical image processingUniversity:Computer visionPattern recognition and machine learningObject/feature detection and tracking

What I like

Simple but clever solutions to complicated or complex problemsProfiling performance and memory consumptionContinuous improvementClean, readable codeThe boy scout ruleWorking as a teamHands-on attitudeFixing root causes instead of symptoms
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Programming Languages


3D Programming

Unity 3D90%Ogre90%OpenGL/WebGL80%DirectX70%

Computer Vision

OpenCV70%Matlab80%Point Cloud Library50%

Augmented Reality/Depth Sensing SDKs

Vuforia, Kudan, Structure, Intel RealSense

High performance computing

SIMD (SSE/AVX/Neon), OpenCL, Cuda

SCM & Continuous Integration

CMake, GIT, GitHub, GitLab, Jenkins, Teamcity, Docker, Yarn/NPM, Maven, SonarQube

Software Engineering

Unit Testing/TDD, Agile Software Development (Scrum, Kanban), Clean Code, Continuous Improvement

Podcast Appearances

Pair-Programming Tour:

Mob Mentality Show

Software Developers Jorney

Legacy Code Rocks

Conference Visits

Socrates Austria, Linz
October 4-5, 2019

Unity Unite, Amsterdam
June 27-29, 2017

Meeting C++, Berlin
December 5-6, 2014

Agile Tour, Vienna
2013, 2014, 2018

DevFest, Vienna
2013, 2015, 2016, 2017, 2019

Winter Augmented Reality Meeting, Graz 2016


Mob-Programming on Open Source Software, Vienna (Organizer)
Unity Meetup Vienna, Vienna (Organizer)
Vienna Computer Vision Meetup, Vienna (Co-organizer)




Basketball, snowboarding, cycling, surfing

Professional Experience

09.2016 - 10.2019

three10, Vienna

Software Engineer, Unity3D/C#/C++/TypeScript/JavaScript

The three10 software allows delivering presentations including 2D and 3D media content synchronized across multiple devices. For example, a mobile device can be used for remote-controlling the presentation while a high-end graphics device is visualizing the presentation on a high-resolution video wall.

As one of two principal engineers in a team of 6 developers, I am the main responsible engineer for the secure communication and file transfer between the Unity 3D application and the on-premise backend server. The architecture of the TypeScript/React/Node.js backend software is also one of my responsibilities.

Most notable achievements:

Implemented a JavaScript library for streaming server-side Unity 3D graphics in real-time from a cloud server to an HTML5 browser using a low-latency video codec.Implemented HTML5 Server-Sent-Events for pushing data updates from the backend server to the Unity 3D client software (C# client implementation, as well as Node.js server implementation).Implemented a Docker deployment pipeline for our on-premise backend software, in order to minimize the impact of running the software on various operating systems and versions.Implemented screen capturing and streaming over the network.Became the go-to guy for Git, Docker, Gitlab, Gitlab CI and Unity Cloud Build.Principal technical contact during the Audi software security certification process.

See the three10 multi-client presentation and collaboration software in action:

04.2015 - 08.2016

ViewAR, Vienna

Software Engineer, C++/Objective-C/Java

The ViewAR application framework combines a native C++ core, with an HTML5 User Interface allowing low-effort User Interface customization and supports multiple platforms (iOS, Android, Windows).

As the principal engineer in the C++ team, I was responsible for extending and improving the ViewAR core module and integrating the latest third-party Augmented and Virtual Reality SDKs.

Most notable achievements:

An algorithm for computing the volume of scanned objects has been implemented. Therefore, a watertight (hole-free) 3D triangle mesh has to be computed from the original 3D model captured with depth-sensing cameras. See the 3D scanning and volume computation application in action:Cross-compiling the ViewAR C++ core using Emscripten/WebAssembly to JavaScript and WebGLIntegrated video decoding in order to support video textures in 3D 10.2013 - 04.2015

Agfa Healthcare, Vienna

3D Volume Rendering Engineer, C++

I have been the main engineer responsible for extending and maintaining Agfa's volume rendering engine, in a team of 8 engineers located in Austria, Belgium, and Canada. The engine supports GPU and CPU rendering, the CPU version heavily uses SIMD instructions for boosting the CPU rendering performance.

Most notable achievements:

Implemented bi-cubic filtering for improving the resampling quality of low-resolution images using WebGLImplemented a CMake build system, in order to replace the separate build scripts for several platforms

See the volume rendering engine in action:

09.2010 - 10.2013

Agfa Healthcare, Vienna

Software Engineer, 3D Visualization, Java

In a team of 22 people, I was responsible for implementing and maintaining 3D visualization features and the loading of volume image data.

Most notable achievements:

Implemented progressive loading of volume image data (patent claimed)Visualization of the normal plane in the unfolded blood vessel viewImproved visualization of the intersection of 2D annotations with the current view plane (semi-transparent rendering of the part overlapping with the adjacent slice) 10.2009 - 07.2010

Austrian Institute of Technology (AIT), Vienna

Master thesis, Computer Vision, Matlab

An asynchronous Data Interface for Event-based Stereo Vision Systems

The aim of my master thesis was to improve 3D reconstruction accuracy of a stereo camera system using special image sensors which only transmits data for the pixels sensing light intensity changes (for example movements).

Most notable achievement:

Improved image quality/sharpness by adjusting the retention time of pixel events depending on the event density, which is an indicator for the movement velocity 02.2009 - 07.2009

Computer Vision Center, Universitat Autònoma de Barcelona, Spain

Final year project, Feature Detection, Matlab

Intestinal Content Detection in Capsule Endoscopy using Robust Features

The aim of this project was to develop a method supporting the automatic analysis of capsule endoscopy studies in order to handle the large amount of image data in the daily clinical routine.

Most notable achievement:

Implemented a Support Vector Machines (SVM) detector for detecting intestinal content (71 % accuracy)


Catalysts Coding Contest

Biggest programming contest in the German-speaking countries (Germany, Austria and Switzerland).

October 19, 2012, Vienna:26th place (250 participants)October 21, 2011, Vienna:26th place (130 participants)

The goal was to be the first finishing all levels of the assignment.


10.2007 - 10.2011

Vienna University of Technology

MSc in Computer Science, Visual Computing


Image processing(Real-time) computer graphicsMachine learningPattern recognitionComputer visionAugmented reality 02.2009 - 07.2009

Universitat Autònoma de Barcelona, Spain

University exchange program, Computer Vision


Feature detection (SIFT, SURF)Machine learning (e.g. SVM) 09.2005 - 07.2007

Upper Austria University of Applied Sciences, Hagenberg

BSc in Computer Science, Medical Software Engineering


09.1999 - 07.2004

High School/Junior College, Leonding

Electroinc Data Processing and Business Administration

Voluntary work

02.2014 - 02.2017

Jugend Umwelt Platform (environmental youth organization), Vienna

Member of the advisory board
08.2013 - 08.2016

Green Team, Frequency Festival, St. Pölten

Team leader
I was leading a group of volunteers performing an anti-littering campaign on the camping site at the Frequency Festival (approx. 50,000 daily attendees). 01.2003 - 12.2012

Kulturprojekt Inzersdorfer Freundeskreis (cultural association)

Cultural event management

I was one of the main organizers of open-air festivals (approx. 1,200 attendees), concerts and cultural events. I was responsible for the artist booking, music line-up and the communication bridge between the artists and the audio/light engineers.

09.2004 - 12.2010

Austrian Red Cross, Ebensee

Emergency Medical Responder & Ambulance Driver

Alternative civilian service (full time) for 1 year and volunteer (approx. 1-2 twelve-hour shifts per month) for 5 years.



Presentation and collaboration software made...

The three10 software allows delivering presentations including 2D and 3D media content synchronized

Presentation and collaboration software made...

The three10 software allows delivering presentations including 2D and 3D media content synchronized

ViewAR 3D scanning and volume computation

An algorithm for computing the volume of scanned objects has been implemented. Therefore, a

Bicubic resampling using WebGL

Improved image quality for low-resolution data set by applying bicubic resampling using WebGL

Blood vessel viewing feature

The normal planes of the blood vessel view is interesting for immediately identifying stenosis

Asynchronous Data Interface

Prior event-based vision systems used buffers over periodic time slices for converting the

Space-time visualization

This tool was part of my master thesis, for visualizing the original data of the event-based image

Intestinal Content Detector

The SIFT feature detector is used for detecting points of interest, additionally a SVM classifier Page 1 of


Robi Hammerle, three10 GmbH

I love Harald's passion to explore new things and to share his skills with others. He always strives for the best practices, instead of the quick, "naive" solution. I worked with him for over 2 years. He definitely made me a better programmer!

Alexander Hörmandinger, Agfa Healthcare GmbH

Harald's eagerness to grow as a developer in order to perfect coding skills, as well as his willingness to share knowledge make him a first-class software craftsman. His strong enthusiasm for software development and collaboration among developers is an inspiration to me.

Ferdinand Pilz, three10 GmbH

Harald is a fun coworker and downright team player who always tries to improve his and the team's performance by encouraging regular code reviews and practicing pair programming. He always strives to find a clean and elegant solution to the problem that integrates well with the existing codebase.


Let's keep in touch

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