Options
Classifications
Display a classified point cloud.
To make use of classification data available in a point cloud (in this example, a 3D Tiles point cloud), we have to use a custom PointCloudMaterial
. Updating a classification (color and visibility) is done directly on this material with the .classifications
property.
import { Color } from 'three';
import { MapControls } from 'three/examples/jsm/controls/MapControls.js';
import { CSS2DObject } from 'three/examples/jsm/renderers/CSS2DRenderer.js';
import Instance from '@giro3d/giro3d/core/Instance.js';
import Tiles3D from '@giro3d/giro3d/entities/Tiles3D.js';
import Tiles3DSource from '@giro3d/giro3d/sources/Tiles3DSource.js';
import Inspector from '@giro3d/giro3d/gui/Inspector.js';
import PointCloudMaterial, { MODE } from '@giro3d/giro3d/renderer/PointCloudMaterial.js';
// Defines projection that we will use (taken from https://epsg.io/2154, Proj4js section)
Instance.registerCRS(
'EPSG:2154',
'+proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=49 +lat_2=44 +x_0=700000 +y_0=6600000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs',
);
const viewerDiv = document.getElementById('viewerDiv');
const instance = new Instance(viewerDiv, {
crs: 'EPSG:2154',
renderer: {
clearColor: false, // To make the canvas transparent and show the actual CSS background
},
});
// Enables post-processing effects to improve readability of point cloud.
instance.renderingOptions.enableEDL = true;
instance.renderingOptions.enableInpainting = true;
instance.renderingOptions.enablePointCloudOcclusion = true;
// Creates controls
const controls = new MapControls(instance.camera.camera3D, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.2;
instance.camera.camera3D.position.set(227137, 6876151, 128);
controls.target.set(227423, 6876442, 0);
controls.saveState();
instance.useTHREEControls(controls);
// We create a PointCloudMaterial in CLASSIFICATION
// mode to display the point classifications.
const material = new PointCloudMaterial({ mode: MODE.CLASSIFICATION });
// The material provides default colors for classifications 0-63,
// i.e the reserved range for ASPRS classifications.
// Classifications in the 64-255 range are user-defined.
material.classifications[64].color = new Color(0x94a770); // Classification "Sursol pérenne"
material.classifications[65].color = new Color(0xd3ff00); // Classification "Artefacts"
material.classifications[66].color = new Color(0x00ff8d); // Classification "Points virtuels"
// Original dataset extracted from the French IGN LIDAR HD
// database (https://geoservices.ign.fr/lidarhd#telechargementclassifiees),
// then converted to 3D Tiles with py3dtiles (https://gitlab.com/py3dtiles/py3dtiles)
const url =
'https://3d.oslandia.com/giro3d/3d-tiles/LHD_FXX_0227_6877_PTS_C_LAMB93_IGN69/tileset.json';
const pointcloud = new Tiles3D('pointcloud', new Tiles3DSource(url), {
material,
});
// add pointcloud to scene
instance.add(pointcloud);
Inspector.attach(document.getElementById('panelDiv'), instance);
// Bind events
const classificationNames = new Array(32);
// GUI controls for classification handling
function addClassification(number, name) {
const currentColor = material.classifications[number].color.getHexString();
const template = `
<div class="form-check form-switch">
<input
class="form-check-input"
type="checkbox"
checked
role="switch"
id="class-${number}"
autocomplete="off"
/>
<label class="form-check-label w-100" for="class-${number}">
<div class="row">
<div class="col" >${name}</div>
<div class="col-auto">
<input
type="color"
style="height: 1.5rem"
class="form-control form-control-color float-end"
id="color-${number}"
value="#${currentColor}"
title="Classification color"
/>
</div>
</div>
</label>
</div>
`;
const node = document.createElement('div');
node.innerHTML = template;
document.getElementById('classifications').appendChild(node);
const colorPicker = document.getElementById(`color-${number}`);
colorPicker.oninput = function oninput() {
// Let's change the classification color with the color picker value
const hexColor = colorPicker.value;
// Parse it into a THREE.js color
const color = new Color(hexColor);
material.classifications[number].color = color;
instance.notifyChange();
};
classificationNames[number] = name;
const toggle = document.getElementById(`class-${number}`);
toggle.oninput = function oninput() {
// By toggling the .visible property of a classification,
// all points that have this classification are hidden/shown.
material.classifications[number].visible = toggle.checked;
instance.notifyChange();
};
}
// Standard ASPRS classifications found in the dataset
addClassification(1, 'Unclassified');
addClassification(2, 'Ground');
addClassification(3, 'Low vegetation');
addClassification(4, 'Medium vegetation');
addClassification(5, 'High vegetation');
addClassification(6, 'Building');
addClassification(9, 'Water');
// Dataset-specific classifications
addClassification(64, 'Permanent above-ground structures');
addClassification(65, 'Artifacts');
addClassification(67, 'Virtual points');
const labelElement = document.createElement('div');
labelElement.classList = 'badge rounded-pill text-bg-light';
labelElement.style.marginTop = '2rem';
const classifName = document.createElement('span');
classifName.style.marginLeft = '0.5rem';
const classifColor = document.createElement('span');
classifColor.classList = 'badge rounded-pill';
classifColor.style.color = 'white';
classifColor.style.background = 'red';
classifColor.style.width = '1rem';
classifColor.innerText = ' ';
labelElement.appendChild(classifColor);
labelElement.appendChild(classifName);
const label = new CSS2DObject(labelElement);
instance.add(label);
// Let's query the classification of the picked point and display it in the label.
function updateLabel(mouseEvent) {
const results = instance.pickObjectsAt(mouseEvent, { radius: 6 });
// Reset label visibility
label.visible = false;
if (results && results.length > 0) {
for (const result of results) {
const { object, point, index } = result;
const classificationIndex = object.getClassification(index);
const classification = material.classifications[classificationIndex];
// Let's ignore hidden classifications
if (classification && classification.visible) {
const color = classification.color.getHexString();
classifColor.style.background = `#${color}`;
classifName.innerText = classificationNames[classificationIndex];
label.visible = true;
label.position.copy(point);
label.updateMatrixWorld(true);
break;
}
}
}
instance.notifyChange();
}
function bindSlider(name, callback) {
const slider = document.getElementById(name);
slider.oninput = function oninput() {
callback(slider.valueAsNumber);
instance.notifyChange(pointcloud);
};
}
bindSlider('pointSize', v => {
material.size = v;
});
function bindToggle(name, callback) {
const toggle = document.getElementById(name);
toggle.oninput = () => {
const state = toggle.checked;
callback(state);
instance.notifyChange(pointcloud);
};
}
bindToggle('postProcessingEffects', v => {
instance.renderingOptions.enableEDL = v;
instance.renderingOptions.enableInpainting = v;
instance.renderingOptions.enablePointCloudOcclusion = v;
});
instance.domElement.addEventListener('mousemove', updateLabel);
<!doctype html>
<html lang="en">
<head>
<title>Point cloud classification</title>
<meta charset="UTF-8" />
<meta name="name" content="point_cloud_classification" />
<meta name="description" content="Display a classified point cloud." />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="icon" href="https://giro3d.org/images/favicon.svg" />
<link href="https://giro3d.org/assets/bootstrap-custom.css" rel="stylesheet" />
<script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
<link
rel="stylesheet"
type="text/css"
href="https://giro3d.org/latest/css/example.css"
/>
<style>
#viewerDiv canvas {
background: rgb(132, 170, 182);
background: radial-gradient(circle, rgba(132, 170, 182, 1) 0%, rgba(37, 44, 48, 1) 100%);
}
</style>
</head>
<body>
<div id="viewerDiv" class="m-0 p-0 w-100 h-100"></div>
<div id="panelDiv" class="position-absolute top-0 start-0 mh-100 overflow-auto"></div>
<div class="side-pane-with-status-bar" style="width: 21rem">
<div class="mh-100 overflow-y-auto">
<div class="card mb-1">
<div class="card-header">Options</div>
<div class="card-body">
<fieldset>
<!-- Point size -->
<div class="input-group mb-2">
<label for="pointSize" class="form-label">Point size</label>
<input
type="range"
min="0"
max="10"
value="0"
class="form-range"
id="pointSize"
autocomplete="off"
/>
</div>
<!-- Enable point cloud effects -->
<div class="form-check form-switch">
<input
class="form-check-input"
type="checkbox"
checked="true"
role="switch"
id="postProcessingEffects"
autocomplete="off"
/>
<label class="form-check-label" for="postProcessingEffects"
>Post-processing effects</label
>
</div>
</fieldset>
</div>
</div>
<div class="card mb-1">
<div class="card-header">Classifications</div>
<div class="card-body">
<fieldset id="classifications">
<!-- Classifications are added dynamically from the JS example -->
</fieldset>
</div>
</div>
</div>
</div>
<script type="module" src="index.js"></script>
<script>
/* activate popovers */
const popoverTriggerList = [].slice.call(
document.querySelectorAll('[data-bs-toggle="popover"]'),
);
popoverTriggerList.map(
// bootstrap is used as script in the template, disable warning about undef
// eslint-disable-next-line no-undef
popoverTriggerEl =>
new bootstrap.Popover(popoverTriggerEl, {
trigger: 'hover',
placement: 'left',
content: document.getElementById(
popoverTriggerEl.getAttribute('data-bs-content'),
).innerHTML,
html: true,
}),
);
</script>
</body>
</html>
{
"name": "point_cloud_classification",
"dependencies": {
"@giro3d/giro3d": "0.37.3"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}