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This tool is used to bind a character’s skin to its 
bones or muscles.
Using Capture Geometry
-
Click the
Capture Geometry tool on the Characters tab. -
Select the geometry objects to capture and press Enter to confirm your selection.
-
Select the root object of the capturing hierarchy and press Enter to confirm your selection.
For specific parameter help see the Capture Geometry operation.
To fully understand what is done behind the scenes for these two methods, you may wish to look at the SOPs that are added for each of the captured geometry objects.
Parameters
Method
Specify whether the tool should replace or append any pre-existing weights on the skin geometry.
Type
Biharmonic
Computes weights using biharmonic distances.
Proximity
Computes weights using spatial distances.
Regions
Computes weights using the capture regions in bones.
Select
Choose how bones are to be selected. If set to Root of Skeleton, then selecting an object in the viewport will also select all descendant output objects. If set to Individual Bones, then only single bones are selected at a time.
Use Capture Pose
Creates a setup that uses the bones' capture pose parameters instead of their transforms at a particular capture frame.
Channel Group Prefix
The channel group name prefix used when creating channel groups to contain the newly created channels when setting keys. This is only used when Use Capture Pose is disabled.
Capture Frame
The frame to use for capturing the bones to the geometry. This is only used when Use Capture Pose is disabled.
Set Keys on Capturing Hierarchy at Capture Frame
Creates keys at the Capture Frame on objects used for capturing. This is only valid when Use Capture Pose is disabled.
Set Keys on Geometry at Capture Frame
Creates keys at the Capture Frame on the objects containing the skin geometry. This is only valid when Use Capture Pose is disabled.
Max Iterations
The number of biharmonic solver iterations. More iterations produce higher quality results. This is only used when Type is set to Biharmonic.
High Precision
If enabled, creates a more precise setup using 
Solid Conform instead of 
Solid Embed. This is only used when Type is set to Biharmonic.