Houdini 18.5 Nodes TOP nodes

USD Import TOP node

Creates work items from prims found in a USD stage.

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Since 18.0

This node reads a USD file or LOP node and creates work items based on search criteria. The search is done on the composed stage of the specified input USD or LOP.

TOP Attributes

primname

string

The name of the primitive.

primpath

string

The full path to the primitive.

Parameters

Create Attributes

Generate When

Determines when this node will generate work items. You should generally leave this set to "Automatic" unless you know the node requires a specific generation mode, or that the work items need to be generated dynamically.

All Upstream Items are Generated

This node will generate work items once all of the input nodes have generated their work items.

All Upstream Items are Cooked

This node will generate work items once all of the input nodes have cooked their work items.

Each Upstream Item is Cooked

This node will generate work items each time a work item in an input node is cooked.

Automatic

The generation mode is selected based on the generation mode of the input nodes. If any of the input nodes are generating work items when their inputs cook, this node will be set to Each Upstream Item is Cooked. Otherwise, it will be set to All Upstream Items are Generated.

Source

The input the node reads to create the work items.

USD

Determines the source of the USD file or LOP node.

Custom File Path

Uses the USD file specified by the custom file path.

Upstream Output File

Uses the output file produced by the upstream work item as the path to the USD file.

LOP Node

Reads the composed stage from the specified LOP node.

File Tag

The data tag that identifies the result from the upstream work item.

This parameter is only available when USD is set to Upstream Output File.

File Path

The path to the USD file to be read.

This parameter is only available when USD is set to Custom File Path.

LOP Path

The path to the LOP node from which to read the composed stage.

This parameter is only available when USD is set to LOP Node.

Traversal

The search criteria the node uses to create the work items.

Primitives

The Primitive Matching Pattern to apply to the specified input stage.

Evaluation Time

Determines how attribute keyframe values from the input stage are interpolated.

Work Item Frame

Uses the frame on the generated work item.

Custom Time

Uses the given time in seconds.

Houdini Time

Uses the Houdini playbar time.

Strip Layers Preceding Layer Break

When on, any layers preceding a Layer Break LOP node connected directly or indirectly to the requested LOP node will be stripped from the USD stage before importing the stage.

This parameter is only applicable when the input is a LOP node.

Data Extraction

Prim Path

When on, adds the specified string attribute to the primitive path.

Prim Name

When on, adds the specified string attribute to the primitive name.

Import Attributes

Specifies the attribute pattern to use to identify which USD attributes to extract and then extracts those attributes.

Note

The :type syntax is not supported.

Examples

USDImport Example for USD Import TOP node

This example demonstrates how to generate work items from primitives in a LOP stage using the USD Import TOP node.

See also

TOP nodes