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visual3d:documentation:modeling:segments:virtual_segments [2024/06/18 13:29] – sgrangervisual3d:documentation:modeling:segments:virtual_segments [2024/07/17 15:45] (current) – created sgranger
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 +====== Virtual Segments ======
 +
 We have grown accustomed to referring to **Kinematic Only** Segments as **Virtual Segments.** The defining criterion for distinguishing a **Virtual Segment** from other segments in Visual3D is that these segments do not get included in the Inverse Dynamics calculations. These segments cannot be assigned external forces and will not have **Joints** created at their proximal end points. We have grown accustomed to referring to **Kinematic Only** Segments as **Virtual Segments.** The defining criterion for distinguishing a **Virtual Segment** from other segments in Visual3D is that these segments do not get included in the Inverse Dynamics calculations. These segments cannot be assigned external forces and will not have **Joints** created at their proximal end points.
  
 Virtual Segments are not actually segments as the term is commonly used but are actually a convenient way of identifying local coordinate systems (**Segment Coordinate Systems)** Virtual Segments are not actually segments as the term is commonly used but are actually a convenient way of identifying local coordinate systems (**Segment Coordinate Systems)**
  
-===== Virtual Laboratory =====+==== Virtual Laboratory ====
  
 For example, Virtual Laboratory Segments are often created to provide the means for accommodating segment angles (such as the pelvis or the foot) relative to the direction of walking. This means that it doesn't matter which direction the subject is walking because the path of progression can be defined explicitly. Below are some pages that detail how one would define a virtual lab that is in a different direction from the lab coordinate system as well as how one would define a virtual lab that changes direction with walking progression. For example, Virtual Laboratory Segments are often created to provide the means for accommodating segment angles (such as the pelvis or the foot) relative to the direction of walking. This means that it doesn't matter which direction the subject is walking because the path of progression can be defined explicitly. Below are some pages that detail how one would define a virtual lab that is in a different direction from the lab coordinate system as well as how one would define a virtual lab that changes direction with walking progression.
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 (The Virtual Lab is also explained on the [[Visual3D:Tutorials:Modeling:Virtual_Laboratory_|Virtual Lab Tutorial]]) (The Virtual Lab is also explained on the [[Visual3D:Tutorials:Modeling:Virtual_Laboratory_|Virtual Lab Tutorial]])
  
-==== Absolute Joint Angles ====+=== Absolute Joint Angles ===
  
 Once the virtual laboratory segment has been created, you can create an absolute angle (segment angle relative to lab). Once the virtual laboratory segment has been created, you can create an absolute angle (segment angle relative to lab).
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 <HTML><li></HTML>Another common use is for [[Visual3D:Documentation:Pipeline:Model_Based_Data_Commands:Joint_Angle#Joint_Angle_Normalization|Normalizing Joint Angles]]. Normalization is the process of referencing a joint (or segment) angle to the reference posture. In Visual3D the reference posture is the static trial used for the link model. We usually recommend the use of virtual segments, which can be defined so that they explicitly cause the static trial to be a reference posture.<HTML></li></HTML><HTML></ul></HTML> <HTML><li></HTML>Another common use is for [[Visual3D:Documentation:Pipeline:Model_Based_Data_Commands:Joint_Angle#Joint_Angle_Normalization|Normalizing Joint Angles]]. Normalization is the process of referencing a joint (or segment) angle to the reference posture. In Visual3D the reference posture is the static trial used for the link model. We usually recommend the use of virtual segments, which can be defined so that they explicitly cause the static trial to be a reference posture.<HTML></li></HTML><HTML></ul></HTML>
  
-===== Virtual Segments for Comparison =====+==== Virtual Segments for Comparison ====
  
 Virtual Segments are a good way to compare segment model variations. Visual3D will allow multiple segment definitions. A user/researcher may examine the differences between these segments by creating multiple virtual segments. Virtual Segments are a good way to compare segment model variations. Visual3D will allow multiple segment definitions. A user/researcher may examine the differences between these segments by creating multiple virtual segments.
visual3d/documentation/modeling/segments/virtual_segments.1718717376.txt.gz · Last modified: 2024/06/18 13:29 by sgranger