Livery Editor – Layers / Group

Provides operations on linked-set (group) layers - material propagation to child layers.

Overview

ui_liveryEditor_layers_group manages group (linkedSet) layers in the livery editor. It propagates material properties (colour, metallic, roughness, normal intensity) to all child layers in the group.

Extension path: lua/ge/extensions/ui/liveryEditor/layers/group.lua

Exports (M)

Internals

Group Actions

Groups support a limited action set compared to decals:

• material - colour/metallic/roughness editing
• ungroup - dissolves the group, moves children to the parent
• lock - toggles layer lock
• delete - removes the group and its children

Color via Properties System

Unlike decals which have a direct color field, groups use a properties table with a dirty flag:

M.setColor = function(layer, rgbaArray)
  if not layer.properties.color then
    layer.properties["color"] = { id = "color", value = rgbaArray }
  else
    layer.properties["color"].value = rgbaArray
  end
  layer.propertiesDirty = true
  api.setLayer(layer, false)   -- commit dirty properties
  layer.propertiesDirty = false
  api.setLayer(layer, true)    -- re-render
end

Child Propagation

Metallic, roughness, and normal intensity are set by iterating all layer.children and calling api.setLayer on each:

M.setMetallicIntensity = function(layer, metallicIntensity)
  for k, childLayer in ipairs(layer.children) do
    childLayer.metallicIntensity = metallicIntensity
    api.setLayer(childLayer, true)
  end
end

How It Works

1. Groups are linkedSet type layers containing child decal layers
2. Colour is set via the properties system with a dirty flag cycle
3. Material intensities are propagated to each child individually
4. The action set is more limited than decals (no transform/mirror/duplicate)

Example Usage

local group = extensions.ui_liveryEditor_layers_group
local api = extensions.editor_api_dynamicDecals

local layer = api.getLayerByUid(groupUid)
group.setColor(layer, {1, 0, 0, 1})
group.setMetallicIntensity(layer, 0.8)

Additional Exports

The following exports are available but not yet documented in detail:

• M.getLayerActions
• M.setNormalIntensity
• M.setRoughnessIntensity