Link Manager & Relationship Overrides

The Link Manager is a dedicated top-level section of Scene Light Manager. It coordinates Blender's advanced relationship configurations: Light Linking, Shadow Linking, multi-pass Light Groups, and Collection-Level overrides. By toggling the N-Panel mode selector to LINKS, you bypass native property editors, handling compositing tags and receiver groups directly next to each light.

Link Manager Panel
Link Manager Mode inside the main panel list
Official Blender References: LINK_BLEND Light & Shadow Linking | LINK_BLEND Cycles Light Groups

1. The Core Relationship Columns (LG, LL, SL)

The Link Manager displays three assigner icons on the right side of every light row:

LIGHT_GROUP Light Group (LG)
Circle Shape (⚪)

Cycles compositor routing tag. Directs the active light's output into a dedicated image pass during rendering.

Use Case: Separate key/fill passes in post
Color Assignment Order:
LIGHT_LINKING Light Linking (LL)
Diamond Shape (🔶)

Illumination receiver control. Choose exactly which meshes or collections are affected by this specific light source.

Use Case: Add character rim highlight only
Color Assignment Order:
SHADOW_LINKING Shadow Linking (SL)
Rounded Square Shape (⬜)

Shadow blocking override. Designate which meshes cast shadows or let rays pass through them invisibly.

Use Case: Remove ceiling/rig shadows
Color Assignment Order:

2. Expanded Relationship Sub-panels

Clicking any of the relationship icons (LL, SL) in the list expands the selected item, revealing the inline relationship management sub-panel directly within the list row:

Expanded Link Manager Item
Expanded inline sub-panel for managing Light/Shadow Linking object assignments
LINK_BLEND Create & Link Collections

Instantly create new receiver/blocker collections, name them, and add selected 3D viewport objects with a single click.

RESTRICT_SELECT_OFF Quick Selection Toggles

Select all linked receiver objects in the 3D viewport directly from the expanded list row, or wipe relationships instantly using the clear (X) buttons.

3. LIGHT_LINKING Light Linking Deep-Dive

Light Linking allows artists to isolate the illumination contribution of a light to a specific subset of objects, ignoring others entirely.

Light Linking Panel Properties
Light Linking collection properties panel and object assignments
Use Cases
  • Apply a sharp specular outline to a character's hair without washing out background elements.
  • Illuminate products or packages without projecting bright pools on the tabletop base.
Setup Workflow
  1. Switch the N-Panel mode selector to LINKS.
  2. Select the target light from the list.
  3. Under Light Linking, create a receiver collection and click Link Objects to assign selected meshes.

[NOTE] Engine Support & Visualizers: Light Linking and Shadow Linking are supported in Cycles, and in newer Blender versions (4.2+), they are also fully compatible with EEVEE (EEVEE Next). Note that mesh lights (geometry emitters) still require the Cycles engine to render ray-traced emission. Enabling GPU Highlights in Preferences renders a clear, light-blue outline in the 3D viewport around all objects that are actively receiving illumination from the selected light.

Light & Shadow Linking Object Outline
Viewport highlight outlines showing objects linked to the active light source

4. SHADOW_LINKING Shadow Linking Deep-Dive

Shadow Linking allows you to control which objects physically block light and cast shadows for a specific emitter.

Shadow Linking Panel Properties
Shadow Linking collection properties panel and object assignments
Use Cases
  • Pass light rays cleanly through ceiling panels, window frames, or camera rigs without creating unwanted shadows.
  • Selectively exclude specific props from casting blocky shadow silhouettes.
Setup Workflow
  1. Select the emitter in the LINKS panel.
  2. Under Shadow Linking, add or link a blocker collection.
  3. Light will pass through any unlisted scene meshes, casting shadows only from the explicitly assigned objects.

5. LIGHT_GROUP Light Groups Deep-Dive (Compositing)

Isolate light contributions during final rendering, outputting independent image passes for different lights (e.g., Key, Fill, Rim, Environmental) to tweak colors and intensities in post-production without re-rendering.

  • Color Tagged Management: Create custom Light Groups directly in the SLM links interface and assign descriptive colors to visually categorize your lights in the outliner list.
  • Instant Re-assignment: Quickly shift select multiple lights in the list and assign them to a specified Light Group using the gear actions popup.

6. Collection-Level Overrides & State Memory

Configure properties globally at the collection or rig level, applying rules to all nested lights automatically.

State Memory & Non-Destructive Actions

Before overriding properties, SLM automatically caches the original values (original exposure, light group, and linking target collections) inside custom attributes on each object data block.

Dynamic Recovery Moving a light out of an overridden collection instantly restores its original exposure, light groups, and linking settings.
Toggle Locks Disabling or deleting the collection-level override immediately reverts all nested lights to their unique pre-override configurations.