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visual3d:documentation:modeling:segments:segment_geometry

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visual3d:documentation:modeling:segments:segment_geometry [2025/05/02 19:34] – wikisysopvisual3d:documentation:modeling:segments:segment_geometry [2025/05/02 19:34] (current) – wikisysop
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 For segments modeled as frusta of right cones, VISUAL3D requires both the proximal and distal segment radii. If both a medial and a lateral target are used at the end of a segment during the subject calibration, then the radius at that end is determined to be one-half of the distance between these targets. If only a single target is used at a segment end, then a qualifier, either DIST_RAD or PROX_RAD, must be used. For segments modeled as frusta of right cones, VISUAL3D requires both the proximal and distal segment radii. If both a medial and a lateral target are used at the end of a segment during the subject calibration, then the radius at that end is determined to be one-half of the distance between these targets. If only a single target is used at a segment end, then a qualifier, either DIST_RAD or PROX_RAD, must be used.
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 ===== Cylinders - Right elliptical cylinders ===== ===== Cylinders - Right elliptical cylinders =====
  
 For segments modeled as right elliptical cylinders, VISUAL3D requires a proximal segment radius, a distal segment radius (major axis), and a segment depth (minor axis radius). The inertial properties of the segment are calculated using the distal radius, the depth and the computed segment length. However, the proximal radius is still required to determine the location of the proximal segment end. If both a medial and lateral targets are used at one end of a segment during subject calibration, then the radius at that end is determined to be one-half of the distance between these targets. If only a single target is used at the end of a segment then a qualifier, either DIST_RAD or PROX_RAD, must be used. The depth of cylindrical segments must always be specified. The cylindrical depth is equal to one-half the distance from anterior to posterior. The qualifier DEPTH is used to specify this distance. For segments modeled as right elliptical cylinders, VISUAL3D requires a proximal segment radius, a distal segment radius (major axis), and a segment depth (minor axis radius). The inertial properties of the segment are calculated using the distal radius, the depth and the computed segment length. However, the proximal radius is still required to determine the location of the proximal segment end. If both a medial and lateral targets are used at one end of a segment during subject calibration, then the radius at that end is determined to be one-half of the distance between these targets. If only a single target is used at the end of a segment then a qualifier, either DIST_RAD or PROX_RAD, must be used. The depth of cylindrical segments must always be specified. The cylindrical depth is equal to one-half the distance from anterior to posterior. The qualifier DEPTH is used to specify this distance.
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 ===== Spheres ===== ===== Spheres =====
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 **One notable difference arises in creating spherical segments. VISUAL3D expects the distal targets to be located at 50% of the distance between segment ends. This allows the distal radius to produce a realistic measure of the dimension of the sphere.** **One notable difference arises in creating spherical segments. VISUAL3D expects the distal targets to be located at 50% of the distance between segment ends. This allows the distal radius to produce a realistic measure of the dimension of the sphere.**
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 ===== Ellipsoids ===== ===== Ellipsoids =====
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 **One notable difference arises in creating elliptical segments. VISUAL3D expects the distal targets to be located at 50% of the distance between segment ends. This allows the distal radius to produce a realistic measure of the elliptical dimensions.** **One notable difference arises in creating elliptical segments. VISUAL3D expects the distal targets to be located at 50% of the distance between segment ends. This allows the distal radius to produce a realistic measure of the elliptical dimensions.**
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 ===== Segment Geometry Settings ===== ===== Segment Geometry Settings =====
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 In order to compute the moments of inertia for segments that have a cylindrical geometry, VISUAL3D requires that the depth of all cylinders be specified. The cylindrical depth is equal to one-half the distance from anterior to posterior. The qualifier DEPTH is used to specify this distance. In order to compute the moments of inertia for segments that have a cylindrical geometry, VISUAL3D requires that the depth of all cylinders be specified. The cylindrical depth is equal to one-half the distance from anterior to posterior. The qualifier DEPTH is used to specify this distance.
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visual3d/documentation/modeling/segments/segment_geometry.txt · Last modified: 2025/05/02 19:34 by wikisysop