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ArcGIS Runtime SDK for .NET

Feature layer rendering mode (scene)

This code sample is available for these platforms:
View Sample on GitHub

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

screenshot

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

Click 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

  • Scene
  • FeatureLayer
  • FeatureLayer.RenderingMode
  • SceneView

Tags

3D, FeatureRenderingMode, MapViews SceneViews and UI, dynamic, static

Sample Code

<UserControl
    x:Class="ArcGISRuntime.UWP.Samples.FeatureLayerRenderingModeScene.FeatureLayerRenderingModeScene"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <TextBlock Text="Static mode:" 
                   Grid.Row="0" Grid.ColumnSpan="2"
                   FontWeight="SemiBold" VerticalAlignment="Center"
                   Foreground="RoyalBlue"/>
        <esriUI:SceneView x:Name="MyStaticSceneView" 
                          Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2" />
        <TextBlock Text="Dynamic mode:" 
                   Grid.Row="2" Grid.Column="0"
                   FontWeight="SemiBold" VerticalAlignment="Center"
                   Foreground="RoyalBlue"/>
        <Button Content="Animated zoom" 
                Grid.Row="2" Grid.Column="1"
                HorizontalAlignment="Stretch"
                Click="Button_Click"  />
        <esriUI:SceneView x:Name="MyDynamicSceneView" 
                          Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2" />
    </Grid>
</UserControl>
// 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 System;

namespace ArcGISRuntime.UWP.Samples.FeatureLayerRenderingModeScene
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Feature layer rendering mode (Scene)",
        "Layers",
        "This sample demonstrates how to use load settings to change the preferred rendering mode for a scene. Static rendering mode only redraws features periodically when a sceneview is navigating, while dynamic mode dynamically re-renders as the scene moves.",
        "Press the 'Animated Zoom' button to trigger a zoom. Observe the differences between the two scenes.")]
    public partial class FeatureLayerRenderingModeScene
    {
        // 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()
        {
            InitializeComponent();

            // Initialize the sample.
            Initialize();
        }

        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.
            MyStaticSceneView.Scene = staticScene;
            MyDynamicSceneView.Scene = dynamicScene;
        }

        private void Button_Click(object sender, Windows.UI.Xaml.RoutedEventArgs e)
        {
            // Zoom out if zoomed.
            if (_zoomed)
            {
                MyStaticSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
                MyDynamicSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
            }
            else // Zoom in otherwise.
            {
                MyStaticSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
                MyDynamicSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
            }

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