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Related Concept Videos

Virtual Work01:20

Virtual Work

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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
In static equilibrium, a body can experience an imaginary or virtual movement, such as displacement or rotation. The virtual work done by a force is equal to the dot product of force and virtual displacement in the direction of the force. When it comes to virtually rotating a...
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Principle of Virtual Work: Problem Solving01:13

Principle of Virtual Work: Problem Solving

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The principle of virtual work is an essential concept in the field of mechanics and engineering. This is used to solve problems related to the equilibrium of a structure or system. It is based on the assumption that if a system is in equilibrium, the work done by all the forces during a virtual displacement is zero. This principle is applied by considering virtual displacements of the system and the corresponding work done by internal and external forces.
To apply the principle of virtual work,...
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Virtual Work for a System of Connected Rigid Bodies01:06

Virtual Work for a System of Connected Rigid Bodies

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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
Next,...
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
Radionuclide Testing
Radionuclide testing is a sophisticated medical technique for assessing gastrointestinal motility. It focuses on gastric emptying and colonic transit time. Radioactive markers track the movement of food through the digestive system, providing insights into gastrointestinal disorders.
In gastric emptying studies, a meal's liquid and...
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Substitution Rule Applied to Indefinite Integrals01:27

Substitution Rule Applied to Indefinite Integrals

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When a force is applied to a linear spring, the restoring force increases proportionally with the amount of displacement. This behavior is described by Hooke’s law, which allows the work done on the spring to be determined directly from the force–displacement relationship. In this case, the force varies in a simple and predictable manner, making the calculation relatively simple.On the other hand, a nonlinear spring does not obey Hooke’s law. Its restoring force depends on...
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Substitution Rule Applied to Definite Integrals01:24

Substitution Rule Applied to Definite Integrals

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When evaluating a definite integral whose integrand matches the structure of a composite function, the substitution method provides an efficient way to simplify the calculation. This method is based on reversing the chain rule from differentiation, allowing a complicated expression to be rewritten in a simpler form. When the integrand contains an inner function and its derivative, substitution naturally reduces the complexity of the problem.The core idea of substitution for definite integrals...
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Updated: Feb 1, 2026

The use of Biofeedback in Clinical Virtual Reality: The INTREPID Project
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The use of Biofeedback in Clinical Virtual Reality: The INTREPID Project

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Applying virtual reality in forensics - a virtual scene walkthrough.

Till Sieberth1,2, Akos Dobay3, Raffael Affolter3

  • 1Institute of Forensic Medicine, University of Zurich, Winterthurerstrasse 190/52, CH-8057, Zurich, Switzerland. till.sieberth@irm.uzh.ch.

Forensic Science, Medicine, and Pathology
|December 7, 2018
PubMed
Summary
This summary is machine-generated.

Forensic investigations can use virtual reality (VR) for 3D scene reconstructions during interrogations. This method allows for reproducible virtual walkthroughs, enhancing evidence examination and court presentation.

Keywords:
3D reconstructionForensicInvestigationScene walkthroughVirtual reality

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Area of Science:

  • Forensic Science
  • Digital Forensics
  • Virtual Reality Applications

Background:

  • Effective forensic investigation relies on meticulous documentation and interpretation of evidence.
  • Traditional methods like photography are supplemented by advanced 3D documentation technologies.
  • 3D data is crucial for visualization and creating accurate scene reconstructions.

Purpose of the Study:

  • To introduce a novel approach integrating forensic 3D data with virtual reality (VR).
  • To enable immersive virtual reality scene walkthroughs for witness and suspect interrogations.
  • To provide a method for preserving and revisiting crime scenes virtually, irrespective of time elapsed since the incident.

Main Methods:

  • Utilizing 3D documentation technologies to capture crime scene data.
  • Processing 3D data for visualization and reconstruction purposes.
  • Implementing virtual reality (VR) for interactive scene walkthroughs during interrogations.

Main Results:

  • VR walkthroughs allow for reproducible examination of original scenes.
  • The method enables "seeing through the eyes" of witnesses by recording their behavior.
  • Recorded VR sessions facilitate subsequent analysis, reconstruction, and improved scene understanding.

Conclusions:

  • This VR approach enhances the investigative process by offering immersive and reproducible scene analysis.
  • Recorded behavioral data within VR can serve as valuable evidence in legal proceedings.
  • The integration of forensic 3D data and VR offers a powerful tool for modern forensic investigations.