Houdini 18.0 Nodes TOP nodes

Render IFD TOP node

Creates work items that render an IFD file with Mantra

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Generates work items that render an IFD file using Mantra. The IFD file can be read from upstream, or manually specified with a custom path.



Work Item Generation

Whether this node generates static or dynamic work items. You should generally leave this set to "Automatic" unless you know the node’s work items can be computed statically, or that they need to be generated dynamically.


This node always creates dynamic work items: it waits until the upstream work items are known, and generates new work items from the upstream work items.


This node always creates static work items: it creates the number of work items it thinks it needs based on the parameters (and any upstream static items) before the network runs.


If the input is static (a static processor, or a partitioner with only static inputs, or a mapper), this node generates static work items, otherwise it generates dynamic work items.

Cache Mode

How the processor node handles work items that report expected file results.


If the expected result file exists on disk, the work item is marked as cooked without being scheduled. If the file does not exist, the item is scheduled as normal.

Read Files

If the expected result file exists on disk, the work item is marked as cooked without being scheduled. Otherwise the work item is marked as failed.

Write Files

Work items are always scheduled and the excepted result file is ignored, even if it exists on disk.


File Source

The source of the IFD file

Upstream Output File

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

Custom File Path

IFD file specified by a custom filepath.

File Tag

The data tag used to select the result from the upstream work item.

IFD Path

The path to the IFD file.


Output Path

Overrides the image output file name.

Extra Mantra Args

Specifies extra arguments that will be passed to the Mantra executable when rendering the IFD.


TOP Scheduler Override

This parameter overrides the TOP scheduler for this node.

Work Item Priority

This parameter determines how the current scheduler prioritizes the work items in this node.

Inherit From Upstream Item

The work items inherit their priority from their parent items. If a work item has no parent, its priority is set to 0.

Custom Expression

The work item priority is set to the value of Priority Expression.

Node Defines Priority

The work item priority is set based on the node’s own internal priority calculations.

This option is only available on the Python Processor TOP, ROP Fetch TOP, and ROP Output TOP nodes. These nodes define their own prioritization schemes that are implemented in their node logic.

Priority Expression

This parameter is only available when Work Item Priority is set to Custom Expression.

This parameter specifies an expression for work item priority. The expression is evaluated for each work item in the node.


example_top_renderifd Example for Render IFD TOP node

This example demonstrates how to render ifd files using the renderifd node.

See also

TOP nodes