Part II – Collecting and processing data
Part II: Collecting and processing dataHaving covered the basics of what a Qualisys system is, in this video we discuss […]
Biomechanics
Part I – What is a Qualisys system?
TSO Workshops Országos Sportegészségügyi Intézet Budapest, Hungary July 26, 2022 Part I: What is a Qualisys system? In this first […]
Visual3D Basics Unit 8 – Chapter 2 – Force plate data
One of the most common pieces of equipment in a biomechanics lab is the force plate. When synchronized with kinematic data from a motion capture system, in Visual3D it is very easy to obtain joint kinetics. However, force plates can also provide standalone data as shown in this chapter.
Visual3D Basics Unit 6 – Chapter 6 – Euler sequences
Simpler motions, typically benefit from the use of a Cardan sequence, however, more complex joints like the shoulder may require the use of an Euler sequence. In this chapter, we highlight the need for and use of Euler sequences to calculate joint angles. However, these concepts can be applied to other parameters as well.
Visual3D Basics Unit 6 – Chapter 5 – Cardan sequences
Throughout many calculations in biomechanics – and therefore Visual3d – the Cardan sequence has a significant impact on the results. In this chapter, we explain what a Cardan sequence is, and how it impacts your data when calculating, for example, a joint angle.
Visual3D Basics Unit 6 – Chapter 4 – Joint rotations
The most fundamental relationship between the motion of two segments is the the joint rotation. This motion is described by a 3×3 matrix and is the basis for joint angles.
Visual3D Basics Unit 6 – Chapter 3 – Coordinate systems
Many types of calculations in biomechanics involve kinematics in some respect. The motion between two segments is the foundation for many calculations such as joint angles and joint moments. For this reason, it is essential to understand how coordinate systems are defined and how to tweak them to describe exactly what you are trying to measure.
Visual3D Basics Unit 6 – Chapter 1 – Right-hand rule
As an introduction to more advanced calculations in Visual3D, we focus this video on the right-hand rule. In order to understand segment coordinate systems and how they contribute to joint rotation calculations, we need to make sure that the axis defitions are clear. The right-hand rule is an easy tool to use to help users navigate this complex topic.
Visual3D Basics Unit 5 – Chapter 5 – Cervical joint definition
The final segment to discuss is the head. Adding the head to the thorax model, we can define the cervical joint. In this tutorial, we show you how to create a useful landmark at the center of the head in order to create this segment. We also show you some best practices to customize the coordinate system and appearance of the model in Visual3D.
Visual3D Basics Unit 5 – Chapter 4 – Shoulder joint definition
Having already defined the arms in chapter 2 and the thorax in chapter 3 of this unit, we can now cheat a bit to define the shoulder. In this tutorial, we show you how to append a model to another one by adding the arms to the thorax. We also discuss how to reason through small modifications that might be necessary when appending models.
