Filter building scene layer | ArcGIS Maps SDK for Flutter

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Explore details of a building scene by using filters and sublayer visibility.

Image of a building scene layer

Use case

Buildings and their component parts (in this example, structural, electrical, or architectural) can be difficult to explain and visualize. An architectural firm might share a 3D building model visualization with clients and contractors to let them explore these components by floor and component type.

How to use the sample

Once the scene is loaded, tap the "Building Filter Settings" button to view the filtering options.

Select a floor from the "Floor" menu to view the internal details of each floor or "All" to view the entire model. Selecting a floor applies a filter that hides all floors above the selected floor and gives the floors below a transparent, X-ray renderer.
Expand the categories under the top-level disciplines to show or hide individual categories in the building model. The entire discipline may be shown or hidden as well.
Tap on any features in the building to view the attributes of the feature.

How it works

Create an ArcGISScene with the URL to a Building Scene Layer service.
Create an ArcGISLocalSceneView and add the scene.
Retrieve the BuildingSceneLayer from the scene's operational layers.
When a floor is selected:
1. A new BuildingFilter is created with two BuildingFilterBlock items.
2. One block defines the solid renderer for features on the selected floor.
3. The second block defines the X-ray filter for features on the floors below the selected floor.
4. Features that exist on floors above the selected floor are not rendered.
5. If “All” is selected, the activeFilter property on the building scene layer is set to null so all features are rendered according to their default settings.
Architectural disciplines and categories are represented by BuildingGroupSublayer and BuildingSublayer objects containing features within a building scene layer. When checked or unchecked, the visibility of the group or sublayer is set to true (visible) or false (hidden).
When a building feature is clicked on:
1. A call to identifyLayer on the ArcGISLocalSceneViewController is initiated based on the screen offset of the click.
2. The sublayerResults property of the returned IdentifyLayerResult will contain the identified features. Note that the building scene layer features are NOT returned in the geoElements property of the results.
3. The details of the first identified feature are shown in a popup.

Relevant API

ArcGISLocalSceneView
ArcGISScene
BuildingComponentSublayer
BuildingFilter
BuildingFilterBlock
BuildingSceneLayer

About the data

This sample uses the Esri Building E Local Scene web scene, which contains a Building Scene Layer representing Building E on the Esri Campus in Redlands, CA. The Revit BIM model was brought into ArcGIS using the BIM capabilities in ArcGIS Pro and published to the web as a Building Scene Layer.

Additional information

Buildings in a Building Scene Layer can be very complex models composed of sublayers containing internal and external features of the structure. Sublayers may include structural components like columns, architectural components like floors and windows, and electrical components.

Applying filters to the Building Scene Layer can highlight features of interest in the model. Filters are made up of filter blocks, which contain several properties that allow control over the filter's function. Setting the filter mode to X-Ray, for instance, will render features with a semi-transparent white color so other interior features can be seen. In addition, toggling the visibility of sublayers can show or hide all the features of a sublayer.

Sample Code

filter_building_scene_layer.dart
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// Copyright 2025 Esri
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import 'package:arcgis_maps/arcgis_maps.dart';
import 'package:arcgis_maps_sdk_flutter_samples/common/common.dart';
import 'package:flutter/material.dart';

class FilterBuildingSceneLayer extends StatefulWidget {
  const FilterBuildingSceneLayer({super.key});

  @override
  State<FilterBuildingSceneLayer> createState() =>
      _FilterBuildingSceneLayerState();
}

class _FilterBuildingSceneLayerState extends State<FilterBuildingSceneLayer>
    with SampleStateSupport {
  // Create a controller for the local scene view.
  final _localSceneViewController = ArcGISLocalSceneView.createController();

  // Building scene layer that will be filtered. Set after the WebScene is loaded.
  late final BuildingSceneLayer _buildingSceneLayer;

  // A flag for when the map view is ready and controls can be used.
  var _ready = false;

  // A listing of all floors in the building scene layer.
  var _floorList = <String>[];

  // The currently selected floor.
  var _selectedFloor = 'All';

  // Flag to show or hide the settings pane.
  var _settingsVisible = false;

  // Building scene layer sublayer that contains the currently selected feature.
  BuildingComponentSublayer? _selectedSublayer;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        top: false,
        left: false,
        right: false,
        child: Stack(
          children: [
            Column(
              children: [
                Expanded(
                  // Add a local scene view to the widget tree and set a controller.
                  child: ArcGISLocalSceneView(
                    controllerProvider: () => _localSceneViewController,
                    onLocalSceneViewReady: onLocalSceneViewReady,
                    onTap: onTap,
                  ),
                ),
                Center(
                  // Button to show the building filter settings sheet.
                  child: ElevatedButton(
                    onPressed: () => setState(() => _settingsVisible = true),
                    child: const Text('Building Filter Settings'),
                  ),
                ),
              ],
            ),
            // Display a progress indicator and prevent interaction until state is ready.
            LoadingIndicator(visible: !_ready),
          ],
        ),
      ),
      // Bottom sheet that displays the building filter settings.
      bottomSheet: _settingsVisible
          ? FilterSettingsSheet(
              floorList: _floorList,
              selectedFloor: _selectedFloor,
              onFloorChanged: (floor) {
                setState(() => _selectedFloor = floor);
                updateFloorFilters();
              },
              onClose: () => setState(() => _settingsVisible = false),
              buildingSceneLayer: _buildingSceneLayer,
            )
          : null,
    );
  }

  Future<void> onLocalSceneViewReady() async {
    // Create the local scene from a ArcGISOnline web scene.
    final sceneUri = Uri.parse(
      'https://arcgisruntime.maps.arcgis.com/home/item.html?id=b7c387d599a84a50aafaece5ca139d44',
    );
    final scene = ArcGISScene.withUri(sceneUri)!;

    // Load the scene so the underlying layers can be accessed.
    await scene.load();

    // Get the BuildingSceneLayer from the webmap.
    _buildingSceneLayer = scene.operationalLayers
        .whereType<BuildingSceneLayer>()
        .first;

    // Get the floor listing from the statistics.
    final statistics = await _buildingSceneLayer.fetchStatistics();
    if (statistics['BldgLevel'] != null) {
      final floorList = <String>[];
      floorList.addAll(statistics['BldgLevel']!.mostFrequentValues);
      floorList.sort((a, b) => int.parse(b).compareTo(int.parse(a)));
      setState(() {
        _floorList = floorList;
      });
    }

    // Apply the scene to the local scene view controller.
    _localSceneViewController.arcGISScene = scene;

    // Set the ready state variable to true to enable the sample UI.
    setState(() => _ready = true);
  }

  Future<void> onTap(Offset offset) async {
    // Clear the current selection.
    if (_selectedSublayer != null) {
      _selectedSublayer!.clearSelection();
      _selectedSublayer = null;
    }

    // Identify on the building scene layer.
    final identifyResult = await _localSceneViewController.identifyLayer(
      _buildingSceneLayer,
      screenPoint: offset,
      tolerance: 12,
    );

    // Select the first identified feature and show the feature details in a popup.
    if (identifyResult.sublayerResults.isNotEmpty) {
      final sublayerResult = identifyResult.sublayerResults.first;
      if (sublayerResult.geoElements.isNotEmpty) {
        final identifiedFeature = sublayerResult.geoElements.first as Feature;
        final sublayer =
            sublayerResult.layerContent as BuildingComponentSublayer;
        sublayer.selectFeature(identifiedFeature);
        _selectedSublayer = sublayer;

        if (mounted) {
          showFeatureDetail(context: context, feature: identifiedFeature);
        }
      }
    }
  }

  // Utility function to update the building filters based on the selected floor.
  void updateFloorFilters() {
    if (_selectedFloor == 'All') {
      // No filtering applied if 'All' floors are selected.
      _buildingSceneLayer.activeFilter = null;
      return;
    }

    // Build a building filter to show the selected floor and an xray view of the floors below.
    // Floors above the selected floor are not shown at all.
    final buildingFilter = BuildingFilter(
      name: 'Floor filter',
      description: 'Show selected floor and xray filter for lower floors.',
      blocks: [
        BuildingFilterBlock(
          title: 'solid block',
          whereClause: 'BldgLevel = $_selectedFloor',
          mode: BuildingSolidFilterMode(),
        ),
        BuildingFilterBlock(
          title: 'xray block',
          whereClause: 'BldgLevel < $_selectedFloor',
          mode: BuildingXrayFilterMode(),
        ),
      ],
    );

    // Apply the filter to the building scene layer.
    _buildingSceneLayer.activeFilter = buildingFilter;
  }

  // Display the feature details in a Popup view in a modal bottom sheet.
  void showFeatureDetail({
    required BuildContext context,
    required Feature feature,
  }) {
    showModalBottomSheet<void>(
      context: context,
      isScrollControlled: true,
      useSafeArea: true,
      builder: (_) => SizedBox(
        height: MediaQuery.sizeOf(context).height * 0.7,
        child: FeaturePopupView(
          feature: feature,
          onClose: () => Navigator.of(context).maybePop(),
        ),
      ),
    ).ignore();
  }
}

// The filter setting bottom sheet that allows the user to select the building
// floor feature sublayers.
class FilterSettingsSheet extends StatelessWidget {
  const FilterSettingsSheet({
    required this.floorList,
    required this.selectedFloor,
    required this.onFloorChanged,
    required this.onClose,
    required this.buildingSceneLayer,
    super.key,
  });

  final List<String> floorList;
  final String selectedFloor;
  final ValueChanged<String> onFloorChanged;
  final VoidCallback onClose;
  final BuildingSceneLayer buildingSceneLayer;

  @override
  Widget build(BuildContext context) {
    return BottomSheetSettings(
      onCloseIconPressed: onClose,
      settingsWidgets: (context) => [
        _FloorLevelSelector(
          floorList: floorList,
          selectedFloor: selectedFloor,
          onChanged: onFloorChanged,
        ),
        const Divider(),
        const Text('Categories:'),
        _SublayerSelector(buildingSceneLayer: buildingSceneLayer),
      ],
    );
  }
}

// Widget to list and select building floor.
class _FloorLevelSelector extends StatelessWidget {
  const _FloorLevelSelector({
    required this.floorList,
    required this.selectedFloor,
    required this.onChanged,
  });

  final List<String> floorList;
  final String selectedFloor;
  final ValueChanged<String> onChanged;

  @override
  Widget build(BuildContext context) {
    final options = ['All', ...floorList];
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: [
        const Text('Floor:'),
        DropdownButton<String>(
          value: selectedFloor,
          items: options
              .map(
                (value) => DropdownMenuItem(value: value, child: Text(value)),
              )
              .toList(),
          onChanged: (value) {
            if (value != null) onChanged(value);
          },
        ),
      ],
    );
  }
}

// Widget to show and select building sublayers.
class _SublayerSelector extends StatefulWidget {
  const _SublayerSelector({required this.buildingSceneLayer});
  final BuildingSceneLayer buildingSceneLayer;

  @override
  State<_SublayerSelector> createState() => _SublayerSelectorState();
}

class _SublayerSelectorState extends State<_SublayerSelector> {
  @override
  Widget build(BuildContext context) {
    final fullModelSublayer =
        widget.buildingSceneLayer.sublayers.firstWhere(
              (sublayer) => sublayer.name == 'Full Model',
            )
            as BuildingGroupSublayer;
    final categorySublayers = fullModelSublayer.sublayers;
    return SizedBox(
      height: 200,
      child: ListView(
        children: categorySublayers.map((categorySublayer) {
          final componentSublayers =
              (categorySublayer as BuildingGroupSublayer).sublayers;
          return ExpansionTile(
            title: Row(
              children: [
                Text(categorySublayer.name),
                const Spacer(),
                Checkbox(
                  value: categorySublayer.isVisible,
                  onChanged: (val) {
                    setState(() {
                      categorySublayer.isVisible = val ?? false;
                    });
                  },
                ),
              ],
            ),
            children: componentSublayers.map((componentSublayer) {
              return CheckboxListTile(
                title: Text(componentSublayer.name),
                value: componentSublayer.isVisible,
                onChanged: (val) {
                  setState(() {
                    componentSublayer.isVisible = val ?? false;
                  });
                },
              );
            }).toList(),
          );
        }).toList(),
      ),
    );
  }
}