Prof. Dr. Jürgen Döllner
Willy Scheibel

Willy Scheibel

Research assistent with focus on hierarchical data processing and visualization.


Tel.: +49-(0)331 5509-3914
Fax: +49-(0)331 5509-172
Room: H-2.21
Email: willy.scheibel(at)hpi.de


ResearchGate: https://www.researchgate.net/profile/Willy_Scheibel
Google Scholar: https://scholar.google.de/citations?user=SBLqi_QAAAAJ
Website: http://www.willyscheibel.de/
Github: https://github.com/scheibel


Mixed-Projection Treemaps: A Novel Approach Mixing 2D and 2.5D Treemaps

Limberger, Daniel; Scheibel, Willy; Trapp, Matthias; Döllner, Jürgen in Proceedings of the International Conference on Information Visualization 2017 2017 .

2D treemaps are a space-filling visualization technique that facilitate exploration of non-spatial, attributed, tree-structured data using the visual variables size and color. In extension thereto, 2.5D treemaps introduce height for additional information display. This extension entails challenges such as increased rendering effort, occlusion, or the need for navigation techniques that counterbalance the advantages of 2D treemaps to a certain degree. This paper presents a novel technique for combining 2D and 2.5D treemaps using multi-perspective views to leverage the advantages of both treemap types. It enables a new form of overview+detail visualization for complex treemaps and contributes new concepts for real-time rendering of and interaction with mixed-projection treemaps. The technique operates by tilting up inner nodes using affine transformations and animated state transitions. The mixed use of orthogonal and perspective projections is discussed and application examples that facilitate exploration of multi-variate data and benefit from the reduced interaction overhead are demonstrated.
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Teaching activities

Summer Term 2019

  • Lecture "Fundamentals of Software Analytics" (lecturer and tutor)

Winter Term 2018/2019

  • Lecture "Introduction to Software Analytics" (lecturer and tutor)
  • Lecture "Introduction to Software Analytics (MA)" (lecturer and tutor)
  • Seminar "Visualization Algorithms and Techniques" (tutor)

Summer Term 2018

  • Seminar "Games of Life" (tutor)
  • Seminar "Advanced Games of Life" (tutor)

Winter Term 2017/18

  • Seminar "Advanced Development in C++" (lecturer & tutor)

Summer Term 2017

  • Lecture "Advanced Programming Techniques for C++" (tutor)
  • Seminar "Advanced Information Visualization" (tutor)

Winter Term 2016/1017

  • Lecture "Advanced Programming in C++" (tutor)
  • Seminar "Methods and Techniques of Information Visualization" (supervisor)
  • Masters Project "Real-time Monitoring of Massive File Systems" (supervisor)

Summer term 2016

  • Lecture "Computer Graphics II" (tutor)
  • Seminar "Methods and Techniques of Software Visualization" (tutor)
  • Bachelor project "Massive Information Mining for Software Analytics" (supervisor)

Winter term 2015/2016

  • Lecture "Computer Graphics I" (tutor)
  • Seminar "Systems Engineering for Software Analytics" (tutor)
  • Bachelor project "Massive Information Mining for Software Analytics" (supervisor)

Summer term 2015

  • Lecture "Computer Graphics I" (tutor)
  • Seminar "Visual Software Analytics" (tutor)
  • Seminar "Programmierung computergrafischer Verfahren mit C++ und OpenGL" (tutor & co-lecturer)
  • Bachelor project "Software Analytics" (supervisor)

Winter term 2014/2015

  • Lecture "Computer Graphics II" (tutor)
  • Seminar "Visualization for Interactive Software Analytics" (tutor)
  • OpenHPI course "Automated Visual Software Analytics" (tutor)
  • Bachelor project "Software Analytics" (supervisor)

Summer term 2014

  • Seminar "Grafikprogrammierung mit OpenGL und C++" (co-lecturer)
  • Seminar "Information Visualization" (co-tutor)

Winter term 2013/2014

  • Seminar "Software-Analyse und Visualisierung" (co-tutor)