21 lines
1.0 KiB
HTML
21 lines
1.0 KiB
HTML
---
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layout: example.html
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title: Icon Sprites with WebGL
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shortdesc: Rendering many icons with WebGL
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docs: >
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This example shows how to use `ol/renderer/webgl/PointsLayer` to render
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a very large amount of sprites. The above map is based on a dataset from the National UFO Reporting Center: each
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icon marks a UFO sighting according to its reported shape (disk, light, fireball...). The older the sighting, the redder
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the icon.
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A very simple sprite atlas is used in the form of a PNG file containing all icons on a grid. Then, the `texCoordCallback`
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option of the `ol/renderer/webgl/PointsLayer` constructor is used to specify which sprite to use according to the sighting shape.
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The dataset contains around 80k points and can be found here: https://www.kaggle.com/NUFORC/ufo-sightings
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tags: "webgl, icon, sprite, point, ufo"
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cloak:
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- key: pk.eyJ1IjoidHNjaGF1YiIsImEiOiJjaW5zYW5lNHkxMTNmdWttM3JyOHZtMmNtIn0.CDIBD8H-G2Gf-cPkIuWtRg
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value: Your Mapbox access token from https://mapbox.com/ here
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---
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<div id="map" class="map"></div>
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