Illustrates various texture filtering modes on layers.
import { LinearFilter, NearestFilter, Vector3 } from "three";
import { MapControls } from "three/examples/jsm/controls/MapControls.js";
import Instance from "@giro3d/giro3d/core/Instance.js";
import Extent from "@giro3d/giro3d/core/geographic/Extent.js";
import ColorLayer from "@giro3d/giro3d/core/layer/ColorLayer.js";
import Map from "@giro3d/giro3d/entities/Map.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import GeoTIFFSource from "@giro3d/giro3d/sources/GeoTIFFSource.js";
function bindDropDown(id, onChange) {
const element = document.getElementById(id);
if (!(element instanceof HTMLSelectElement)) {
throw new Error(
"invalid binding element: expected HTMLSelectElement, got: " +
element.constructor.name,
);
}
element.onchange = () => {
onChange(element.value);
};
const callback = (v) => {
element.value = v;
onChange(element.value);
};
const setOptions = (options) => {
const items = options.map(
(opt) =>
`<option value=${opt.id} ${opt.selected ? "selected" : ""}>${opt.name}</option>`,
);
element.innerHTML = items.join("\n");
};
return [callback, element.value, element, setOptions];
}
const extent = new Extent(
"EPSG:3857",
1818329.448,
1987320.77,
6062229.082,
6231700.791,
);
const instance = new Instance({
target: "view",
crs: extent.crs,
backgroundColor: "black",
});
const center = new Vector3(1911960, 6130719, 2156);
instance.view.camera.position.set(center.x, center.y, center.z);
const controls = new MapControls(instance.view.camera, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.2;
controls.target.set(center.x, center.y + 1, 0);
instance.view.setControls(controls);
const map = new Map({ extent, backgroundOpacity: 0 });
instance.add(map);
const source = new GeoTIFFSource({
url: "https://3d.oslandia.com/giro3d/rasters/TCI-YCbCr-mask.tif",
crs: extent.crs,
});
let filter = LinearFilter;
function run() {
map.forEachLayer((layer) => map.removeLayer(layer, { disposeLayer: true }));
map.addLayer(
new ColorLayer({
source,
minFilter: filter,
magFilter: filter,
}),
);
}
Inspector.attach("inspector", instance);
bindDropDown("filter", (v) => {
switch (v) {
case "nearest":
filter = NearestFilter;
break;
case "linear":
filter = LinearFilter;
break;
}
run();
});
run();
<!doctype html>
<html lang="en">
<head>
<title>Layer texture filtering.</title>
<meta charset="UTF-8" />
<meta name="name" content="layer_texture_filter" />
<meta
name="description"
content="Illustrates various texture filtering modes on layers."
/>
<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/examples/css/example.css"
/>
</head>
<body>
<div id="view" class="m-0 p-0 w-100 h-100"></div>
<div
id="inspector"
class="position-absolute top-0 start-0 mh-100 overflow-auto"
></div>
<div class="side-pane-with-status-bar">
<div class="card">
<div class="card-body">
<div class="input-group">
<span class="input-group-text flex-grow-1">Filter</span>
<select
class="btn btn-outline-primary btn-sm"
id="filter"
autocomplete="off"
>
<option selected value="linear">Linear filtering</option>
<option value="nearest">Nearest neighbour</option>
</select>
</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": "layer_texture_filter",
"dependencies": {
"@giro3d/giro3d": "0.43.1"
},
"devDependencies": {
"vite": "^3.2.3"
},
"scripts": {
"start": "vite",
"build": "vite build"
}
}