Upgraded Houdini's Python 3.11 version to 3.11.18, pip verison to 26.2.2, certifi version to 2026.10.23 and setuptools 80.9.0. These upgrades include the patches that address the recently reported eMudhra / emSign CA certificate security incident.

Upgraded Houdini's Python version to 3.11.18, pip verison to 26.2.2, certifi version to 2026.10.23 and setuptools 80.9.0. These upgrades include the patches that address the recently reported eMudhra / emSign CA certificate security incident.

Fixed a few parameter issues with the Flipbook ROP:

• Range on the JPEG quality was incorrect.
• OpenColorIO menu order was reversed
• Lighting set to Off had no effect.

Added an experimental feature to Karma to enable parallel syncing of primitives by Hydra. Setting KARMA_PARALLEL_SYNC to '*' will cause all primitives to be sync'ed in parallel. Alternatively, setting it to "camera material" will cause cameras and materials to be sync'ed in parallel. If a primitive doesn't match the tokens in the variable, the default Hydra behaviour is used.

Fixed an issue where on startup some windows flash open and closed.

Fixed a bug where Flipbook ROP output would be incorrect on MacOS devices with Retina displays, because the output viewport would be scaled by the pixel density, instead of matching the target image size

Fixed a memory leak in the APEX Animate state where the Qt objects for the viewer state HUD windows would remain in memory after the state closed.

Fixed an issue with the rotation euler angles in the Camera states jumping unexpectedly when using the handle. It will now properly smooth the rotations to avoid these sudden jumps.

On Windows, fix python inlinecpp bug when defining a function that takes a type pointer, followed by const pointer of the same type. For example, `int two(GU_Detail *g, const GU_Detail *s)` would fail.

The ONNX Cache manager now allows different threads to run different models. Previously only one thread could run any model.

Fixed 2D state UI being incorrectly sized on Retina displays.

Bumped up Houdini's Python versions to 3.11.18 and 3.13.17, pip version to 26.2.2 and certifi version to 2026.10.23. The new versions include the patches that address the recently reported eMudhra / emSign CA certificate security incident.

Modify Point Instances LOP exposes the internal sopnets LOP Import SOPs Purpose parm to allow selecting the purpose to represent the instance geo when diving in the HDA.

Additional Render Vars LOP node now exposes the Utility Path Expression.

Fixed a bug where agent primitives couldn't be selected if they were in a material group with only a single instance in it

Fixed a bug where agent primitives couldn't be selected if they were in a material group with only a single instance in it

Fixed a bug in the Houdini Python 3.11 build that added a little overhead to every HOM call.

Fixed a bug where the animation catalog would fail to capture animation from animation layers that were inherited from an upstream node.

Fixed the brush preview being incorrectly transformed in the UV Viewport.

Fix potential crash on startup when opening a file that has LOPs active

Fixed a bug that prevented the OpenCL SOP from reading updated workset size and offset arrays that would terminate kernels that ran over multiple iterations. In particular this caused the Graph Color SOP used inside the Vellum and Otis solvers to run much slower than necessary, which has now been fixed.

Fixed the viewport FPS counter displaying incorrect values on MacOS, due to a synchronization bug

Fixed a performance regression in Houdini 22 on Linux and macOS in regards to the memory allocator. Large thread counts could cause excessive lock contention inside the allocator, resulting in poor performance. Internal testing has shown performance improvements inside Karma up to 2.14x in specific scenes.

Fixed continual viewport redrawing in the Solaris view if a texture was bad or missing.

Fixed an issue where Karma Fur and Karma Hair VOPs were displaying parameter tooltips which were defined inside the node instead of using the help from the docs. The parameter images now display in the tooltips for these nodes.