Houdini Main Changelogs

21.0.727

Fixed a bug where Karma Fog Box LOP produced undefined results in render when 'Noise' toggle is enabled.

Mon. May 25, 2026
21.0.724

Fixed a bug in Camera Edit LOP where assigning a lens shader using "Lens Shader VOP" parameter (under Karma tab) had no effect. Note that the fix only applies to newly created Camera Edit LOPs.

Fri. May 22, 2026
21.0.724

Fixed potential hanging in both CPU and XPU when rendering volumes, particularly when a ray originating from far far away intersects the volume.

Fri. May 22, 2026
21.0.724

Fixed an issue where the pixel inspector wouldn't read values in some areas when using a render region with Live Render.

Fri. May 22, 2026
21.0.723

Fixed a performance issue when Karma dealt with a very large number of lights.

Thu. May 21, 2026
21.0.723

Updates to Karma camera tint will now properly trigger a sync with the renderer.

Thu. May 21, 2026
21.0.722

Due to bug fixes in outlines, crease-based and contour-based detection methods may produce different looking results when outlines on an object is enabled but respective detection method is disabled and vice versa.

Wed. May 20, 2026
21.0.722

Fixed erroneously generated outlines in cases where:

  • Outlines are enabled but crease-based detection is disabled.
  • Outlines are disabled but contour-based detection is enabled.
Wed. May 20, 2026
21.0.722

Fixed a potential crash with nested instancing of volumes when an instancer has zero instances.

Wed. May 20, 2026
21.0.722

Fixed potential crashes when unpacking packed USD primitives for meshes with invalid subdivision crease attributes.

Wed. May 20, 2026
21.0.722

Fixed load warnings for the Shot Output HDA.

Wed. May 20, 2026
21.0.721

Improved PDG Async Importer performance.

Tue. May 19, 2026
21.0.721

Unreal 5.8 compatability fixes.

Tue. May 19, 2026
21.0.721

Changes to RV_Instance initialization, to allow Extra Extensions to be added at later point in startup. If new extensions are requested after the instance is created, but before the viewport is initialized, the instance will be re-initialized to include all extensions.

Tue. May 19, 2026
21.0.721

Fixed the TOP status bar work item selection menu so it can only be scrolled when the menu is open. This prevents accidental changes to the selected work item in the menu when using the mouse wheel to zoom the network editor, which could trigger a recook of displayed nodes that use work item attributes.

Tue. May 19, 2026
21.0.720

Added a console variable Houdini.GarbageCollection that can be used to enable/disable the plugin's explicit calls to Unreal's Garbage Collector.

Mon. May 18, 2026
21.0.720

Fixed an issue where custom instancer values would not be set correctly when using packed primitives.

Mon. May 18, 2026
21.0.720

Fixed baked actors not being recentered correctly.

Mon. May 18, 2026
21.0.720

Reduced schedular timing, improving performance.

Mon. May 18, 2026
21.0.716

XPU: improved error reporting when CUDA NVML library fails to load

Fri. May 15, 2026
21.0.716

Due to bug fixes in outlines, depth-based and contour-based detection methods may produce different looking results when objects with outlines enabled interact with objects with outlines disabled.

Thu. May 14, 2026
21.0.716

Fixed a bug in outlines where depth-based detection may erroneously draw in lines over objects with outlines disabled that's in close proximity to objects with outlines enabled. Also addresses the issue where objects with outlines disabled always used random ID for contour detection, which prevented users from removing unwanted outlines on objects with outlines disabled using user-defined IDs.

Thu. May 14, 2026
21.0.715

XPU: fixed a gsplats SPH transform rendering bug

Thu. May 14, 2026
20.0.1436

Add missing documentation for KARMA_ALBEDO_AOV_DIFFUSE environment variable.

Thu. May 14, 2026
21.0.716

Fixed Poly Frame tangent frame style of the input geometry in COP Preview Material SOP, to be linked to the MikkT Tangent Space toggle. This fixes render mismatch between VK and Karma rendering of normal maps.

Thu. May 14, 2026