Differences

This shows you the differences between two versions of the page.

--- visual3d:documentation:pipeline:model_based_data_commands:model_cog [2024/09/28 02:23] – Cleaned up page and put into "Model-based Item" style. wikisysop
+++ visual3d:documentation:pipeline:model_based_data_commands:model_cog [2024/11/05 14:15] (current) – [MODEL COG] wikisysop
@@ Line 1: / Line 1: @@
-===== MODEL COG =====
+===== Model COG =====
-This model-based item represents the Center of Gravity of the entire model. This center of gravity is calculated by first calculating the center of mass of each kinetic segment according to that [[visual3d:documentation:modeling:segments:segment_inertia|segment's inertia]]. Visual3D provides default values for segment inertia, but these can be modified by the user to reflect any desired equation.
+This model-based item represents the Center of Gravity of the entire model. This center of gravity is calculated by first calculating the center of mass of each kinetic segment and then calculating the center of mass across all of the model's kinetic segments according to [[https://en.wikipedia.org/wiki/Center_of_mass|mechanical principles patterns]].
-The center of mass of the model is then calculated as the center of mass across all of the model's kinetic segments according to [[https://en.wikipedia.org/wiki/Center_of_mass|mechanical principles patterns]]. [[visual3d:documentation:modeling:segments:virtual_segments|Kinematic-only (or virtual) segments]] are not included in this calculation.
+To express the MODEL COG item in the [[visual3d:documentation:definitions:laboratory_coordinate_system|laboratory coordinate system]], choose the LAB segment as the resolution coordinate system.
-To express the MODEL COG item in the global coordinate system, choose the LAB segment as the resolution coordinate system.
 {{:MODEL_COGdlg.jpg}}
+==== Centre of Mass for a Segment ====
+Visual3D calculates the centre of mass for a segment according to that [[visual3d:documentation:modeling:segments:segment_inertia|segment's inertia]]. Visual3D provides default values for segment inertia, but these can be modified by the user to reflect any desired equation.
+[[visual3d:documentation:modeling:segments:virtual_segments|Kinematic-only (or virtual) segments]] are not included in the calculation of a model's center of gravity.
 ==== Representativeness ====
@@ Line 14: / Line 18: @@
 For example, if the model includes only segments from the lower extremity then the center of mass of the segments will deviate substantially from the center of mass of the individual.
+==== See Also ====
+There are also model-based items for [[visual3d:documentation:pipeline:model_based_data_commands:model_cog_velocity|MODEL_COG_VELOCITY]] and [[visual3d:documentation:pipeline:model_based_data_commands:model_cog_acceleration|MODEL_COG_ACCELERATION]]. Or return to [[visual3d:documentation:visual3d_signal_types:link_model_based_data_type#kinematic_items|LINK_MODEL_BASED items]].