Release Notes for Nuke and Hiero 13.0v5

Release Date

28 September 2021

Warning:  As a result of the current COVID-19 government recommendations here in the UK, much of the Nuke team is still working from home. Currently, Foundry cannot guarantee that our usual high standards of QA have been applied to Nuke's monitor output functionality, including VR headset support, in this release.

Qualified Operating Systems

Note:  Installing Nuke 13.0 takes significantly longer than Nuke 12.2 builds, particularly on Windows OS, due to the upgrade to Python 3 and the addition of the PyTorch library.

macOS Catalina (10.15.x) or macOS Big Sur (11.x)

Windows 10 (64-bit)

CentOS 7.4, 7.5, and 7.6 (64-bit)

Note:  The VFX Platform 2020 upgrade includes library versions that are only compatible with CentOS 7.4, or later.

Other operating systems may work, but have not been fully tested.

Requirements for Nuke's GPU Acceleration

If you want to enable Nuke to calculate certain nodes using the GPU, there are some additional requirements.


An NVIDIA GPU with compute capability 3.0 (Kepler) or above. A list of the compute capabilities of NVIDIA GPUs is available at

Note:  The compute capability is a property of the GPU hardware and can't be altered by a software update.

With graphics drivers capable of running CUDA 10.1 or above. On Windows and Linux, CUDA graphics drivers are bundled with the regular drivers for your NVIDIA GPU. Driver versions 418.96 (Windows) and 418.39 (Linux), or above are required. See for more information.

Note:  We recommend using the latest graphics drivers, where possible, regardless of operating system.


Note:  Bit-wise equality between GPU and CPU holds in most cases, but for some operations there are limitations to the accuracy possible with this configuration.

On Windows and Linux, an AMD GPU from the following list:

Note:  Other AMD GPUs may work, but have not been fully tested.

AMD Radeon Pro WX 7100

AMD Radeon Pro W 5700

AMD Radeon Pro WX 8200

AMD Radeon Pro WX 9100

AMD Radeon RX 6800 XT

Note:  For information on the recommended driver for each GPU, see

On Mac, integrated AMD GPUs are supported on the following Intel CPU Macs:

Any late 2013 Mac Pro onward (including 2019 Mac Pro),

Mid-2015 MacBook Pros onward, and

Late 2017 iMac Pros onward.

All supported Mac Pros include a multi-GPU support option, where applicable. Bitwise equality between GPU and CPU holds in most cases, but for some operations, there are limitations to the accuracy possible with this configuration.

Warning:  Although AMD GPUs are enabled on other Mac models, they are not officially supported and used at your own risk.

Multi-GPU Processing

Nuke's GPU support includes an Enable multi-GPU support option. When enabled in the preferences, GPU processing is shared between the available GPUs for extra processing speed.

Note:  Multi-GPU processing is only available for identical GPUs in the same machine. For example, two NVIDIA GeForce GTX 1080s or two AMD Radeon™ Pro WX 9100s.

New Features

• ID 244774 - Timeline Editing: You can now copy and paste shots and soft effects between different projects in the same Nuke Studio or Hiero session and between Nuke Studio and Hiero sessions.

Feature Enhancements

There are no feature enhancements in this release.

Bug Fixes

• ID 351910 - Timeline Editing: Copying a sequence into a new project did not work as expected.

• ID 352502 - Localization: Clearing a comp or closing and reopening a script discarded the green localization progress bar on Read nodes.

• ID 380723 - Read/Write: Clicking Load Settings from RMD in .r3d files written using IPP2 incorrectly enabled the Colorspace and Gamma Curve controls.

• ID 391032 - DeepRead: Using Tcl and Python expressions in the file control displayed a Plugin Error message.

• ID 405652 - Node liftimeStart knob values were not saved in the Nuke script if the start or end values were 0.

• ID 413707 - EdgeExtend: The Matte has no fully white pixels to sample from error message was not ignored correctly in some cases, causing renders to fail unnecessarily.

• ID 426901 - File Formats Update: In IPP2 Custom mode, enabling the Use GPU checkbox displayed grading controls from the IPP2 Pipeline incorrectly.

• ID 435284 - Python: Calling nuke.message() or nuke.alert() did not pause processing on the main thread as expected.

• ID 440798 - Timeline Editing: Using the Ripple Delete (Shift+Backspace) shortcut in the timeline occasionally offset frames incorrectly.

• ID 461944 - Python: Changing a Read node from an image sequence to a container file format Pythonically caused Nuke to crash if the Read node had postage stamp set to a static frame.

• ID 462986 - Read/Write: Importing .mov files with custom resolutions occasionally caused the application to crash.

• ID 468630 - Monitor Out: Certain controls in the Monitor Out strip did not work as expected.

• ID 475029 - Cryptomatte: The cryptoLayerChoice knob value was not retained when opening certain scripts containing a gizmo.

• ID 483089 - Python: Calling import nuke failed to load modules using Nuke's Python interpreter.

• ID 483350 - Read/Write: Loading unknown file types after loading a .mov file caused Nuke to crash.

• ID 483554 - Developer Info: numCPUs was used where numThreads should be used.

• ID 483961 - Python: Nuke renders did not set the thread count reliably using -m or nuke.env['threads'] = n.

• ID 484526 - Python: Dragging and dropping a custom PySide2 widget on a panel in Nuke caused the application to crash.

• ID 484726 - Soft Effects: Undoing cut or delete operations on cloned effects occasionally decoupled the clone state, reverting it to a standard effect.

• ID 484879 - Soft Effects: Cutting and pasting a clone occasionally created a standard effect, rather than a clone.

• ID 485146 - Developer Info: Nuke's arg parser used a too-small, signed int for memory limits.

• ID 485619 - Cryptomatte: Mattes with floating point IDs containing hyphens could not be selected in the Viewer.

• ID 487403 - Cryptomatte: Clicking Picker Add did not allow you to pick mattes with names containing - (dash) characters.

• ID 488584 - Cryptomatte: Clicking Picker Remove didn't work for mattes with floating point ID values.

New Known Issues Specific to Nuke 13.0

This section covers new known issues and gives workarounds for them, where appropriate.

• ID 486238 - Inference: Previewing a CopyCat .ost file in the application file browser causes Nuke to crash.

• ID 485000 - CopyCat: The description box for error values on the Loss/Step graph does not scale correctly with larger values.

• ID 472519 - CopyCat: Training a network using multi-layer source and ground truth images, such as .exr files, does not work as expected.
As a workaround, use a Shuffle node to remove all layers except rbga.

• ID 471681 - CopyCat: Training a network from the command prompt with the -X argument (execute only the specified node) occasionally fails.

• ID 470149 - CopyCat: Training cannot be resumed from the command line. For example, using copyCatNode.knob('resumeTraining').execute() displays an optimizer error.
As a workaround, open the script in GUI mode and click Resume Training.

• ID 470014 - macOS only: Canceling the CopyCat training progress bar during the validating inputs phase causes Nuke to display an error message.

• ID 470012 - CopyCat: Canceling the training progress bar during the caching inputs phase causes Nuke to crash.

• ID 470001 - CopyCat: The Batch Size tooltip should state that the size must be less than or equal to the number of image pairs in the data set.

• ID 469655 - Monitor Out: Title safe format not showing on perimeter edges of Monitor Out.

• ID 469593 - Monitor Out: The Monitor Out panel tab is difficult to access.

• ID 469578 - Monitor Out: Crashing when changing resolution modes during playback.

• ID 469262 - Monitor Out: Prior to Nuke 13.0v1 it was possible to have multiple Monitor Out devices.

• ID 469132 - USD: Light3 panel shows a small broken column after using read from file.

• ID 468999 - AIR: Using the Deblur, Inference, or Upscale nodes on large images occasionally causes Nuke to crash.

• ID 468980 - Monitor Out: Switching between files that have different aspect ratios leaves behind some of the previous image in the floating window.

• ID 468665 - Nuke Studio: White screen display when scaling the timeline Viewer.

• ID 467984 - USD: Camera3 doesn't show the full camera Path.

• ID 467270 - USD: Can't highlight multiple items in the SceneGraph.

• ID 467265 - USD: Highlight selections gets stuck within the SceneGraph.

• ID 467257 - USD: Pressing Spacebar in the SceneGraph disables items and opens the panel in full-screen at the same time.

• ID 467229 - USD: Layout issues with the Type column when resizing the SceneGraph.

• ID 467209 - USD: Importing a USD with the R hotkey doesn't display the filename in the SceneGraph.

• ID 467198 - CopyCat: Clicking the refresh button above the graph does not update the Runs table.

• ID 467195 - macOS only: Switching desktop while an Upscale node is processing displays an OMP: Warning #190: Forking a process while a parallel region is active is potentially unsafe error message repeatedly on the command line.

• ID 466734 - CopyCat: Stopping training on the CPU and then resuming on the GPU, and the opposite GPU to CPU, does not work as expected.

• ID 465112 - Hydra: Viewing animated USD's file will playback faster, when moving the camera / dragging a selection box over the viewer.

• ID 464964 - Installing Nuke 13.0 takes significantly longer than Nuke 12.2.

• ID 464442 - Cryptomatte: Clicking the Clear button under the Matte List cannot be undone as expected.

• ID 463253 - Hydra: Solid color applied in Hydra Viewer when set to textured in the Display Settings.

• ID 462011 - macOS only: Certain machines running Big Sur display QWidgetWindow() command line errors on start up.

• ID 461710 - USD: Axis, Camera and Light in Viewer are set to default until selected.

• ID 459921 - Toggling the Materials checkbox in the Hydra Viewer causes the grid to display incorrectly.

• ID 459512 - CopyCat: The Properties panel does not always update to reflect changes to upstream channels.
As a workaround, close and reopen the Properties panel.

• ID 458511 - CopyCat: The visibility control in the Graphs tab is reset by the next update if it is toggled while training is running.

• ID 458509 - CopyCat: Enabling or disabling Log Scale in the Graphs tab causes graph updates to lag.

• ID 458508 - CopyCat: Training does not currently stop or display an error if a NaN value is encountered.

• ID 457886 - USD: Alembic .abc items not graying out when read from file is checked until refresh.

• ID 457608 - Monitor Out: Some menus in Monitor Out Strip overflow menu not functional.

• ID 456513 - QPainter error messages printed to the terminal.

• ID 448430 - Monitor Out: Floating window occasionally not minimizing in Nuke Studio.

• ID 445909 - Monitor Out: Video Legal Range not working correctly with certain AJA cards.

• ID 445560 - macOS only: MO XDR: Nuke occasionally crashes on setting Monitor Out workspace when using XDR monitor.

• ID 443270 - Monitor Out: GUI strip updates as viewer spawns.

• ID 441488 - Nuke crashes when executing the Marcom2D script with command line -c 8G.

• ID 440212 - Nuke crashes when executing the Marcom2D script in command line.

• ID 427838 - Windows only: Monitor Out: Moving floating window to 4K monitor crashes or scales incorrectly.

Developer Notes

As Nuke develops, we sometimes have to make changes to the API and ABI under the hood. We try to keep these changes to a minimum and only for certain releases, but from time to time API and ABI compatibility is not guaranteed. See the following table for the situations when you may have to recompile your plug-ins and/or make changes to the source code.

Release Type






12.0v1 to 12.0v2





12.0v1 to 12.1v1




12.0v1 to 13.0v1


Additionally, node Class() names occasionally change between major releases. While these changes do not affect legacy scripts, you may not get the results you were expecting if a node class has been modified. The file, used to create Nuke's node toolbar, contains all the current node class names and is located in <install_directory>/plugins/nukescripts/ for reference.

As an example, between Nuke 9 and Nuke 10, the CameraShake node Class() changed from CameraShake2 to CameraShake3. In the file for the two releases, the entries for the CameraShake node appear as follows:

m.addCommand("CameraShake", "nuke.createNode(\"CameraShake2\")", icon="CameraShake.png")
m.addCommand("CameraShake", "nuke.createNode(\"CameraShake3\")", icon="CameraShake.png")