On this page	Parameters Examples
Since	14.5

The Capture Attribute Unpack SOP takes an index-pair attribute and converts it into a set of array attributes using a naming convention. The resulting set of attributes is easier to manipulate with VEX, and can be repackaged with the Capture Attribute Pack SOP.

How points are captured requires knowledge of both per-point information as well as global metadata about each capture region. The index-pair attribute can store all the metadata as a single attribute, making it convenient to move about, and allowing support for blending and merging of captured geometry. However, it is not very practical for manipulation.

Instead of a single index-pair attribute, a group of detail and point array attributes can be used. The point attributes consist of an index array attribute suffixed with _index which refer to items in metadata, and a data array attribute suffixed with _data which usually stores the weights of each point. The detail attributes are all array attributes that represent properties of the metadata. The primary attributes are indexed directly from the point index array attribute. However, there can also be secondary attributes, with an infix of _secondary#, which represent additional tables of metadata. These will have their own implied indirection rules.

Parameters ¶

Class

The class of attribute storing the data, usually point. The _index and _data attributes should be this class. All the property metadata attributes are detail attributes regardless of this setting.

Attribute

The name of the index-pair attribute to unpack.

Prefix

The prefix followed by index is used to create an integer array attribute to store indices into the metadata. The prefix followed by data is used to create a data array attribute to form the per-element data. If blank, the attribute name followed by _ is used as the prefix.

The metadata is converted to detail array attributes that start with the prefix.

Secondary Prefix

It is possible to have multiple separate tables of metadata. The additional tables have secondary# after the prefix and before the property name (where # is the extra table number starting at 1).

Unpack Properties

When turned on, generates detail array attributes storing all the metadata tables.

Unpack Data

When turned on, generates per-element array attributes storing the index and data values.

Delete Capture Attributes

When turned on, removes the capture attribute after processing, leaving only the generated array attribute.

Examples ¶

Load Launch

VexDeform Example for Capture Attribute Unpack geometry node

This is an example of how to use the Capture Attribute Unpack SOP to turn capture attributes into something accessible to VEX. It then provides methods to smooth the capture attributes and deform them entirely in VEX.

See also

Capture Bone Deform Bone Capture Proximity Capture Correct