Visualize identify results

Select buildings in a 3D Object Scene Layer, view their attributes in a table, and highlight the currently selected building in the scene.

How to use the sample

1. Hold Shift and Left-click to select a building. The Building Select / Identify panel shows:
   • A paged list of all features hit by the ray.
   • A scrollable table of key–value attribute pairs for the current feature.
2. Use the < and > buttons to switch between features when multiple features are returned.
3. Use the menu icon to see a list of buildings.
4. The currently selected building is highlighted in the scene.

How it works

• The sample uses IdentifyLayersAsync on the ArcGISView to perform a ray-based identify between the mouse ray start and end points, obtained from DeprojectMousePositionToWorld and a line trace.
• For each ArcGISGeoElement returned:
  • Its attribute dictionary is read, converted to strings, and stored in an array of FAttributeRow { Key, Value }.
  • All features for the current click are stored as an array of FFeatureAttributeSet, enabling paging when multiple features are hit.
• The UI is a UMG widget:
  • A ListView uses a simple row UObject with Key and Value properties.
  • RefreshListViewFromAttributes() populates the list by setting those properties and adding each row as a list item.
  • Page text (e.g. 1 of 3) is updated based on the current feature index.
• Highlighting workflow:
  • On startup, SetupHighlightAttributesOnMap():
    • Gets the building UArcGIS3DObjectSceneLayer from the map.
    • Calls SetAttributesToVisualize() on the layer’s API object with "OBJECTID" so the material can access each feature’s ID.
    • Applies a material to the layer via SetMaterialReference().
  • When the user changes the selected feature, ApplySelectionToMaterial():
    • Extracts the current feature’s OBJECTID from the attribute rows.
    • Writes this value into a UMaterialParameterCollection scalar parameter SelectedID.
  • The material samples the feature attribute texture, reads the per-pixel OBJECTID, compares it against SelectedID, and renders only the matching feature with a highlight color.

Tags

identify, attributes, select, highlight, 3d buildings