Fixed a bug where Houdini's help system added query string arguments to node help URLs even when the URLs were file paths. The "file:" protocol does not allow query string arguments.

Light LOP state work. Light now will look at placement point by default. Light intensity will adjust based off distance by default. Toggles to do the opposite of ^ added. Fixed bug where some primitive paths would cause errors to be thrown.

Fixed a regression in 18.0 where joint selection did not work in the viewer states for Agent Configure Joints, Agent Collision Layer, and Agent Edit.

Fixed bug in the Material Linker and the Light Linker where modifying the network wouldn't properly update the Python Panel.

Light and camera guides in the LOPs viewer are now easier to select when surrounded by geometry.

Fixed a bug in the Alembic ROP that resulted in Alembic layers that override transform values when not instructed to do so.

The work item expand TOP can now expand upstream attribute values, i.e. if the upstream attribute is an array. It uses the same controls for expanding partitions or upstream file lists, and can create a work item for each slice in the upstream array.

Fixed a bug in the ixres and iyres COP VEX functions.

Update GL shadowmaps when LOPs geometry changes.

Fix data race on Houdini start up that was randomly causing it to crash.

Add option to the USD ROP (enabled by default) to ensure that upAxis and metersPerUnit metadata are explicitly written to every saved layer.

Update USD tool to fix issues where an extra copy of instanced geometry could appear at the origin after modifying the instance.

Fixed inability to remove collections and rename collections. Fixed issue where some collections wouldn't show up even though they should.

Improvements to the USD Render ROP, allowing the output file to be overridden with a parameter, and fixes for multi-frame rendering.

Fixed a crash in the Pyro and Smoke solvers when running in OpenCL mode on the CPU on OSX.

Fixed viewport sluggishness if the GL lighting mode is HQ Lighting and it is showing a Hydra renderer other than the native GL renderer.

HDA Processor: HDA Paramater string values will now be localized on the job side so that paths will resolve correctly

Added popupmenu to light/camera LOP states to work around Bug:100274

Unity plugin: Added support for disabling TerrainCollider in the plugin source via the HEU_TERRAIN_COLLIDER_DISABLED script define.

Karma will now do proper headlight shading when there are no lights in the scene.

Fixed a bug where the Attribute from Map SOP wasn't handling non-default UV Attribute names correctly.

Fixed HAPI_GetWorkitems and HAPI_QueryNodeOutputConnectedNodes.

Relating to lightlinker, materiallinker and lightmixer panels: Expand Light and geometry trees to the first level by default. Fixed python exceptions when MMB on a light tree or gemoetry tree. Fixed problem displaying collections defined with wildcards.

Unity plugin: Added support for overriding the collider mesh for instances when using unity_instance attribute on point clouds. To do so, another string attribute called "collision_geo" that points to the collider asset path needs to be specified. Then the collider assset's mesh will replace the created instances' collider mesh.