Fixed GLSL lighting artifacts (black speckles) from GGX when looking through a light.

Fixed a bug with the HQ Lighting optimization which caused crop-window-like rendering.

Prefer SCENEGRAPH_ icons for the light mixer tool menu.

Fix use of placeholder icons for lights in the lightmixer tool menu.

Ensure that collections are removed from the lightmixer's layout when they are deleted from the node using the UI.

Adding new lights from the Light Mixer LOP action menu no longer dives into the subnet, instead leaving the viewport and network editor contexts unchanged, with the Light Mixer node selected.

The Light Sampling display option now affects the environment light occlusion sampling for speed/quality tradeoffs.

Materials with transparency set to 1.0 will now render specular reflections in the viewer with HQ Lighting and Medium/High Transparency. They previously didn't display at all.

The fireball and bonfire have been slightly tweaked.

In the LightMixer LOP, the transforms tab will now use the same working set as the sliders and attributes tab. Collections, however, will be evaluated for hteir contents and each of those will be added to the transforms tab directly.

Viewport volumes will now use a slightly more accurate shading method in HQ lighting modes.

Fixed layered GL volumetric fog for environment and ambient lights, which were not obeying the height and falloff.

Fixed a temporary regression in the selection highlight display in Houdini GL.

geometry lights now respect visbility flag properties

Fixed a viewport display bug when using HQ Lighting and medium/high quality transparency where transparent objects would sometimes incorrectly appear in front of opaque objects when they were actually behind them.

Fixed bug where light lop spotlight parameters were not properly reflected by light handles. Barndoor handle now properly toggles.

Fixed viewport HQ shading of metallic materials under environment lights.

Further sampling improvement on dome lights with high-contrast HDRIs.

The distant_angle parameter was removed from the Karma specific tab of the Light LOP since it's driven by the USD angle parameter.

Added fixed distance toggle to light state toolbar, when enabled all light placement operations will respect the value in the distance parameter instead of trying to maintain its current distance. The distance parameter is now visible and editable in the state toolbar.

Light LOP state no longer has bounding box/rect handles for resizing. Instead, there is a resize mode that can be entered by pressing 'b'. In this mode, dragging will modify one dimension of the light geometry if applicable.

Added variance anti-aliasing to direct area light sources under Variance convergence mode.

Fixed a bug where IPR updates could cause dome lights to switch to old sampling method which could result in noisier results with very high-contrast HDRI.

Light state UI work: improved text for dragging operations, instead of a long unformated text blob in the prompt there is now a toggleable help text.

Pyro Burst Source SOP will slightly quantize the generated age to avoid undershoot with precision issues.