Houdini Main Changelogs

21.0.602

XPU: Fixed odd colors or possible crash when using OCIO config with small log allocationvars.

yesterday
20.5.850

Fixed drag-and-drop not working in the Context Options editor.

yesterday
21.0.602

XPU: Fixed a bug where Mtlx mix node with vector or color 'mix' parameter may fail to mix every channel if the 'mix' parameter's first channel value is either 0 or 1.

yesterday
21.0.601

Fixed a possible issue with OCIO color translation for some color spaces in Karma XPU. It's unlikely that this bug would ever have been hit.

Mon. January 19, 2026
21.0.601

Fixed a bug where the displayed values for APEX Animation Layer weights would not update while scrubbing, making it difficult to see where they were keyed.

Mon. January 19, 2026
21.0.601

Fixed a bug where outlines would fail to draw if an object with outlines disabled is behind an object with outlines enabled.

Mon. January 19, 2026
21.0.601

Fixed a bug where adjusting the weight channel of an APEX Animation Layer baked out from the ragdoll tool could result in strange behaviour or disappearing geometry due to incorrect default values being set for scale channels.

Mon. January 19, 2026
20.5.849

Fixed a GLSL compile error with the vector4 signature of the materialX noise function.

Mon. January 19, 2026
21.0.601

Fixed a GLSL compile error with the vector4 signature of the materialX noise function.

Mon. January 19, 2026
21.0.601

The Light LOP UI was altered to make it clear that the barn door parameters on the Light LOP shaping tab are Houdini specific.

Mon. January 19, 2026
21.0.598

XPU: Fixed a bug where textured rectangular area light or dome light would have incorrect intensity when using single-channel monochromatic texture.

Fri. January 16, 2026
21.0.598

Fixed regression causing auto-bake to no longer work.

Fri. January 16, 2026
21.0.598

Fixed two bugs related to the ml volume upres workflow.

  • ML Train Volume Upres Recipe now removes the padding correctly for theexample preview output
  • ML Train Volume Upres Recipe now scatters points evenly when using singleframe mode for data generation
Fri. January 16, 2026
21.0.598

Fixed a bug where ML Volume Tile Inference SOP couldn't work with tile sizes other than 48.

Fri. January 16, 2026
21.0.598

Fixed a bug where ML Volume Tile Component SOP couldn't output more than 10 tiles at once.

Fri. January 16, 2026
20.5.845

Fixed a bug where modifying materials on geometry lights could either crash or fail to update.

Thu. January 15, 2026
21.0.597

Fixed a bug where modifying materials on geometry lights could either crash or fail to update.

Thu. January 15, 2026
21.0.597

Added support for parsing output files from logs when using a ROP Fetch TOP with batch work items.

Thu. January 15, 2026
21.0.597

Added 'networkeditor' kwarg to Gear/Preset menus.

Thu. January 15, 2026
21.0.597

Recipes: Ensures that preset menus built with recipeutils.buildPresetMenu() always display the revert label in revert mode as the first entry when no other entries are present. It also fixes a bug in revert mode, where the last invoked recipe name in parentheses would be replaced by the submenu name.

Thu. January 15, 2026
21.0.597

Recipes: When multiple network editors are opened, the placement prompt is initiated from the same network editor that was used to invoke the recipe. Similarly, decoration recipes will find the most suitable network editor for prompting when invoked from a standalone parameter pane or a parameter pane contained inside a network editor.

Thu. January 15, 2026
21.0.596

Added geo::PrimUV<T> apex nodes to interpolate attributes at a specific parametric UV positions.

Added apex nodes for getting and setting Vector[234]Array and Matrix[34]Array attributes.

Wed. January 14, 2026
21.0.596

Fixed a bug where primvars may fail to write to primvar AOV with 'noholdouts' prefix in offline renders.

Wed. January 14, 2026
21.0.596

Fixed a bug where changing material assignment on volumes wouldn't take effect until render restart.

Wed. January 14, 2026
21.0.595

Fixed a Python exception when cooking an FFMPEG Encode Video TOP with a custom input file list.

Tue. January 13, 2026