Feature layer rendering mode (scene)

View inWPFUWPFormsiOSAndroid
View on GitHub

Render features in a scene statically or dynamically by setting the feature layer rendering mode.

Image of feature layer rendering mode scene

Use case

In dynamic rendering mode, features and graphics are stored on the GPU. As a result, dynamic rendering mode is good for moving objects and for maintaining graphical fidelity during extent changes, since individual graphic changes can be efficiently applied directly to the GPU state. This gives the map or scene a seamless look and feel when interacting with it. The number of features and graphics has a direct impact on GPU resources, so large numbers of features or graphics can affect the responsiveness of maps or scenes to user interaction. Ultimately, the number and complexity of features and graphics that can be rendered in dynamic rendering mode is dependent on the power and memory of the device's GPU.

In static rendering mode, features and graphics are rendered only when needed (for example, after an extent change) and offloads a significant portion of the graphical processing onto the CPU. As a result, less work is required by the GPU to draw the graphics, and the GPU can spend its resources on keeping the UI interactive. Use this mode for stationary graphics, complex geometries, and very large numbers of features or graphics. The number of features and graphics has little impact on frame render time, meaning it scales well, and pushes a constant GPU payload. However, rendering updates is CPU and system memory intensive, which can have an impact on device battery life.

How to use the sample

Tap the button to trigger the same zoom animation on both static and dynamicly rendered scenes.

How it works

  1. Create feature layers, setting the rendering mode on each before adding to the scene..
  2. The RenderingMode can be set to Static, Dynamic, or Automatic.

    • In Static rendering mode, the number of features and graphics has little impact on frame render time, meaning it scales well, however points don't stay screen-aligned and point/polyline/polygon objects are only redrawn once map view navigation is complete.
    • In Dynamic rendering mode, large numbers of features or graphics can affect the responsiveness of maps or scenes to user interaction, however points remain screen-aligned and point/polyline/polygon objects are continually redrawn while the map view is navigating.
  3. When left to automatic rendering, points are drawn dynamically and polylines and polygons statically.

Relevant API

  • FeatureLayer
  • FeatureLayer.RenderingMode
  • Scene
  • SceneView

Tags

3D, dynamic, feature layer, features, rendering, static

Sample Code

FeatureLayerRenderingModeScene.cs
                                                                                                                                                                                                                            
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
// Copyright 2018 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: http://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.

using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using System;
using UIKit;

namespace ArcGISRuntime.Samples.FeatureLayerRenderingModeScene
{
    [Register("FeatureLayerRenderingModeScene")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Feature layer rendering mode (scene)",
        category: "Layers",
        description: "Render features in a scene statically or dynamically by setting the feature layer rendering mode.",
        instructions: "Tap the button to trigger the same zoom animation on both static and dynamicly rendered scenes.",
        tags: new[] { "3D", "dynamic", "feature layer", "features", "rendering", "static" })]
    public class FeatureLayerRenderingModeScene : UIViewController
    {
        // Hold references to UI controls.
        private SceneView _staticSceneView;
        private SceneView _dynamicSceneView;
        private UIStackView _stackView;
        private UIBarButtonItem _zoomButton;

        // Points for demonstrating zoom.
        private readonly MapPoint _zoomedOutPoint = new MapPoint(-118.37, 34.46, SpatialReferences.Wgs84);
        private readonly MapPoint _zoomedInPoint = new MapPoint(-118.45, 34.395, SpatialReferences.Wgs84);

        // Viewpoints for each zoom level.
        private Camera _zoomedOutCamera;
        private Camera _zoomedInCamera;

        // URI for the feature service.
        private const string FeatureService = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/";

        // Hold the current zoom state.
        private bool _zoomed;

        public FeatureLayerRenderingModeScene()
        {
            Title = "Feature layer rendering mode (Scene)";
        }

        private void Initialize()
        {
            // Initialize the cameras (viewpoints) with two points.
            _zoomedOutCamera = new Camera(_zoomedOutPoint, 42000, 0, 0, 0);
            _zoomedInCamera = new Camera(_zoomedInPoint, 2500, 90, 75, 0);

            // Create the scene for displaying the feature layer in static mode.
            Scene staticScene = new Scene
            {
                InitialViewpoint = new Viewpoint(_zoomedOutPoint, _zoomedOutCamera)
            };

            // Create the scene for displaying the feature layer in dynamic mode.
            Scene dynamicScene = new Scene
            {
                InitialViewpoint = new Viewpoint(_zoomedOutPoint, _zoomedOutCamera)
            };

            foreach (string identifier in new[] { "8", "9", "0" })
            {
                // Create the table.
                ServiceFeatureTable serviceTable = new ServiceFeatureTable(new Uri(FeatureService + identifier));

                // Create and add the static layer.
                FeatureLayer staticLayer = new FeatureLayer(serviceTable)
                {
                    RenderingMode = FeatureRenderingMode.Static
                };
                staticScene.OperationalLayers.Add(staticLayer);

                // Create and add the dynamic layer.
                FeatureLayer dynamicLayer = (FeatureLayer)staticLayer.Clone();
                dynamicLayer.RenderingMode = FeatureRenderingMode.Dynamic;
                dynamicScene.OperationalLayers.Add(dynamicLayer);
            }

            // Add the scenes to the scene views.
            _staticSceneView.Scene = staticScene;
            _dynamicSceneView.Scene = dynamicScene;
        }

        private void _zoomButton_TouchUpInside(object sender, EventArgs e)
        {
            // Zoom out if zoomed.
            if (_zoomed)
            {
                _staticSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
                _dynamicSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
            }
            else // Zoom in otherwise.
            {
                _staticSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
                _dynamicSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
            }

            // Toggle zoom state.
            _zoomed = !_zoomed;
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView { BackgroundColor = ApplicationTheme.BackgroundColor };

            _staticSceneView = new SceneView();
            _staticSceneView.TranslatesAutoresizingMaskIntoConstraints = false;
            _dynamicSceneView = new SceneView();
            _dynamicSceneView.TranslatesAutoresizingMaskIntoConstraints = false;

            _stackView = new UIStackView(new UIView[] { _staticSceneView, _dynamicSceneView });
            _stackView.TranslatesAutoresizingMaskIntoConstraints = false;
            _stackView.Distribution = UIStackViewDistribution.FillEqually;
            _stackView.Axis = View.TraitCollection.VerticalSizeClass == UIUserInterfaceSizeClass.Compact ? UILayoutConstraintAxis.Horizontal : UILayoutConstraintAxis.Vertical;

            _zoomButton = new UIBarButtonItem();
            _zoomButton.Title = "Zoom";

            UIToolbar toolbar = new UIToolbar();
            toolbar.TranslatesAutoresizingMaskIntoConstraints = false;
            toolbar.Items = new[]
            {
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace),
                _zoomButton,
                new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace)
            };

            UILabel staticLabel = new UILabel
            {
                Text = "Static",
                BackgroundColor = UIColor.FromWhiteAlpha(0f, .6f),
                TextColor = UIColor.White,
                TextAlignment = UITextAlignment.Center,
                TranslatesAutoresizingMaskIntoConstraints = false
            };

            UILabel dynamicLabel = new UILabel
            {
                Text = "Dynamic",
                BackgroundColor = UIColor.FromWhiteAlpha(0f, .6f),
                TextColor = UIColor.White,
                TextAlignment = UITextAlignment.Center,
                TranslatesAutoresizingMaskIntoConstraints = false
            };

            // Add the views.
            View.AddSubviews(_stackView, toolbar, staticLabel, dynamicLabel);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _stackView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _stackView.BottomAnchor.ConstraintEqualTo(toolbar.TopAnchor),
                _stackView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _stackView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),

                toolbar.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                toolbar.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                toolbar.BottomAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.BottomAnchor),

                staticLabel.TopAnchor.ConstraintEqualTo(_staticSceneView.TopAnchor),
                staticLabel.HeightAnchor.ConstraintEqualTo(40),
                staticLabel.LeadingAnchor.ConstraintEqualTo(_staticSceneView.LeadingAnchor),
                staticLabel.TrailingAnchor.ConstraintEqualTo(_staticSceneView.TrailingAnchor),

                dynamicLabel.TopAnchor.ConstraintEqualTo(_dynamicSceneView.TopAnchor),
                dynamicLabel.HeightAnchor.ConstraintEqualTo(40),
                dynamicLabel.LeadingAnchor.ConstraintEqualTo(_dynamicSceneView.LeadingAnchor),
                dynamicLabel.TrailingAnchor.ConstraintEqualTo(_dynamicSceneView.TrailingAnchor)
            });
        }

        public override void TraitCollectionDidChange(UITraitCollection previousTraitCollection)
        {
            base.TraitCollectionDidChange(previousTraitCollection);
            if (View.TraitCollection.VerticalSizeClass == UIUserInterfaceSizeClass.Compact)
            {
                _stackView.Axis = UILayoutConstraintAxis.Horizontal;
            }
            else
            {
                _stackView.Axis = UILayoutConstraintAxis.Vertical;
            }
        }

        public override void ViewWillAppear(bool animated)
        {
            base.ViewWillAppear(animated);

            // Subscribe to events.
            _zoomButton.Clicked += _zoomButton_TouchUpInside;
        }

        public override void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);

            // Unsubscribe from events, per best practice.
            _zoomButton.Clicked -= _zoomButton_TouchUpInside;
        }
    }
}

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.