Extrusion is the process of stretching a flat, 2D shape vertically to create a 3D object in a scene. For example, you can extrude building polygons by a height value to create three-dimensional building shapes.
How to use the sample
Tap the toggle to switch between using population density and total population for extrusion. Higher extrusion directly corresponds to higher attribute values.
How it works
Create a ServiceFeatureTable from a URL.
Create a feature layer from the service feature table.
Make sure to set the rendering mode to dynamic, statesFeatureLayer.renderingMode = RenderingMode.DYNAMIC.
Apply a SimpleRenderer to the feature layer.
Set the ExtrusionMode of the renderer with renderer.sceneProperties.extrusionMode = SceneProperties.ExtrusionMode.BASE_HEIGHT.
Set the extrusion expression of the renderer with renderer.sceneProperties.extrusionExpression = "[POP2007]/ 10".
Relevant API
FeatureLayer
Renderer.SceneProperties
ServiceFeatureTable
SimpleRenderer
Tags
3D, extrude, extrusion, extrusion expression, height, renderer, scene
Sample Code
MainActivity.kt
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/* Copyright 2017 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.
*
*/package com.esri.arcgisruntime.sample.featurelayerextrusion
import android.graphics.Color
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
import com.esri.arcgisruntime.data.ServiceFeatureTable
import com.esri.arcgisruntime.geometry.Point
import com.esri.arcgisruntime.geometry.SpatialReferences
import com.esri.arcgisruntime.layers.FeatureLayer
import com.esri.arcgisruntime.mapping.ArcGISScene
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.view.Camera
import com.esri.arcgisruntime.mapping.view.OrbitLocationCameraController
import com.esri.arcgisruntime.mapping.view.SceneView
import com.esri.arcgisruntime.symbology.Renderer
import com.esri.arcgisruntime.symbology.SimpleFillSymbol
import com.esri.arcgisruntime.symbology.SimpleLineSymbol
import com.esri.arcgisruntime.symbology.SimpleRenderer
import com.esri.arcgisruntime.sample.featurelayerextrusion.databinding.ActivityMainBinding
classMainActivity : AppCompatActivity() {
// set flag for showing total population or population densityprivatevar showTotalPopulation = trueprivateval activityMainBinding by lazy {
ActivityMainBinding.inflate(layoutInflater)
}
privateval sceneView: SceneView by lazy {
activityMainBinding.sceneView
}
privateval toggleButton: Button by lazy {
activityMainBinding.toggleButton
}
overridefunonCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(activityMainBinding.root)
// authentication with an API key or named user is required to access basemaps and other// location services ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY)
// get us census data as a service feature tableval statesServiceFeatureTable =
ServiceFeatureTable(resources.getString(R.string.us_census_feature_service))
// add the service feature table to a feature layerval statesFeatureLayer = FeatureLayer(statesServiceFeatureTable)
// set the feature layer to render dynamically to allow extrusion statesFeatureLayer.renderingMode = FeatureLayer.RenderingMode.DYNAMIC
// create a scene and add it to the scene viewval scene = ArcGISScene(BasemapStyle.ARCGIS_IMAGERY)
sceneView.scene = scene
// add the feature layer to the scene scene.operationalLayers.add(statesFeatureLayer)
// define line and fill symbols for a simple rendererval lineSymbol = SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, Color.BLACK, 1.0f)
val fillSymbol = SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, Color.BLUE, lineSymbol)
val renderer = SimpleRenderer(fillSymbol)
// set renderer extrusion mode to base height, which includes base height of each vertex in calculating z values renderer.sceneProperties.extrusionMode = Renderer.SceneProperties.ExtrusionMode.BASE_HEIGHT
// set the simple renderer to the feature layer statesFeatureLayer.renderer = renderer
// define a look at point for the camera at geographical center of the continental USval lookAtPoint = Point(-10974490.0, 4814376.0, 0.0, SpatialReferences.getWebMercator())
// add a camera and set it to orbit the look at pointval camera = Camera(lookAtPoint, 20000000.0, 0.0, 55.0, 0.0)
val orbitCamera = OrbitLocationCameraController(lookAtPoint, 20000000.0)
sceneView.cameraController = orbitCamera
sceneView.setViewpointCamera(camera)
// set button listener toggleButton.setOnClickListener {
if (showTotalPopulation) {
// divide total population by 10 to make data legible renderer.sceneProperties.extrusionExpression = "[POP2007] / 10"// change text of button to total pop toggleButton.text = resources.getString(R.string.total_pop)
showTotalPopulation = false } else {
// multiple population density by 5000 to make data legible renderer.sceneProperties.extrusionExpression = "[POP07_SQMI] * 5000"// change text of button to pop density toggleButton.text = resources.getString(R.string.density_pop)
showTotalPopulation = true }
}
// click to set initial state toggleButton.performClick()
}
overridefunonPause() {
super.onPause()
sceneView.pause()
}
overridefunonResume() {
super.onResume()
sceneView.resume()
}
overridefunonDestroy() {
super.onDestroy()
sceneView.dispose()
}
}