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--- visual3d:documentation:modeling:modeling_overview [2024/07/17 15:45] – created sgranger
+++ visual3d:documentation:modeling:modeling_overview [2025/02/06 20:28] (current) – wikisysop
@@ Line 3: / Line 3: @@
 At the core of Visual3D is the development of a flexible biomechanical modeling tool that can be used to define an unrestricted number of rigid segments and link them together in a systematic fashion. These segments may be linked implicitly through the motion capture data (e.g. segments in the experiment probably didn't disarticulate) or explicitly through the specification of constraints. The first scenario is handled in Visual3D by assuming that each segment is mathematically independent of all other segments (6 Degrees of Freedom). The second scenario is handled by allowing the specification of joint constraints ([[Visual3D:Documentation:Kinematics_and_Kinetics:Inverse_Kinematics#Inverse_Kinematics_Overview|Inverse Kinematics]]).
-NOTE: For markerless motion capture systems, Visual3D was updated in early 2021 to handle the rotation matrices needed to automatically build models. Customers who have not maintained Visual3D software support may need to contact C-Motion and restart the software support in order to get newer versions of Visual3D.
+**NOTE**: For markerless motion capture systems, Visual3D was updated in early 2021 to handle the rotation matrices needed to automatically build models. Customers who have not maintained Visual3D software support may need to contact HAS-Motion and restart the software support in order to get newer versions of Visual3D.
 === Assign Model to Motion File ===
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 A segment may have, but does not necessarily have to have, inertial properties.
-The [[Visual3D:Documentation:Modeling:Segments:Segment_Properties#Segment_Mass|default mass]] is based on [[[https://deepblue.lib.umich.edu/handle/2027.42/4540|Dempster's regression equations]]].
+The [[Visual3D:Documentation:Modeling:Segments:Segment_Properties#Segment_Mass|default mass]] is based on [[https://deepblue.lib.umich.edu/handle/2027.42/4540|Dempster's regression equations]].
-The [[Visual3D:Documentation:Modeling:Segments:Segment_Properties#Segment_Inertia|default moment of inertia and location of center of mass]] are computed assuming that a [[Visual3D:Documentation:Modeling:Segments:Segment_Properties#Segment_Geometry|segment as a geometrical shape]] (cylinder, cone, sphere, ellipsoid).
+The [[Visual3D:Documentation:Modeling:Segments:Segment_Properties#Segment_Inertia|default moment of inertia and location of center of mass]] are computed assuming that a [[Visual3D:Documentation:Modeling:Segments:Segment_Properties#Segment_Geometry|segment has a geometrical shape]] (cylinder, cone, sphere, ellipsoid).
 Optionally, the user may specify explicitly the inertial properties of the segment.
 A segment may have, but does not necessarily have to have, a decoration.
@@ Line 41: / Line 41: @@
 === Conventional Gait Model ===
-The Conventional Gait Model refers to the marker set (both unilateral and bilateral), the algorithms used to estimate the pose (position and orientation) of the segments, and to the conventions for representing model based items (joint angles and joint moments). This marker set was defined 20 years ago and was largely a result of inadequate technology rather than the best placement of markers. We prefer to think of this marker set as The Legacy Gait Model because presented with a better alternative, most knowledgeable users naturally evolve from this limited representation.
+The Conventional Gait Model refers to the marker set (both unilateral and bilateral), the algorithms used to estimate the pose (position and orientation) of the segments,
+and to the conventions for representing model based items (joint angles and joint moments).
+This marker set was defined 35 years ago and was largely a result of inadequate technology rather than the best placement of markers.
+We prefer to think of this marker set as The Legacy Gait Model because presented with a better alternative, most knowledgeable users naturally evolve from this limited representation.