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WebGL | Maps JavaScript API

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google.maps.WebGLOverlayView class

The WebGL Overlay View provides direct access to the same WebGL rendering context Google Maps Platform uses to render the vector basemap. This use of a shared rendering context provides benefits such as depth occlusion with 3D building geometry, and the ability to sync 2D/3D content with basemap rendering.

With WebGL Overlay View you can add content to your maps using WebGL directly, or popular Graphics libraries like Three.js or deck.gl. To use the overlay, you can extend google.maps.WebGLOverlayView and provide an implementation for each of the following lifecycle hooks: WebGLOverlayView.onAdd, WebGLOverlayView.onContextRestored, WebGLOverlayView.onDraw, WebGLOverlayView.onContextLost and WebGLOverlayView.onRemove.

You must call WebGLOverlayView.setMap with a valid Map object to trigger the call to the onAdd() method and setMap(null) in order to trigger the onRemove() method. The setMap() method can be called at the time of construction or at any point afterward when the overlay should be re-shown after removing. The onDraw() method will then be called whenever a map property changes that could change the position of the element, such as zoom, center, or map type. WebGLOverlayView may only be added to a vector map having a MapOptions.mapId (including maps set to the RenderingType.VECTOR MapOptions.renderingType and using Map.DEMO_MAP_ID as the MapOptions.mapId).

This class extends MVCObject.

Access by calling const {WebGLOverlayView} = await google.maps.importLibrary("maps").
See Libraries in the Maps JavaScript API.

WebGLOverlayView()

Parameters:  None

Creates a WebGLOverlayView.

getMap()

Parameters:  None

onAdd()

Parameters:  None

Return Value:  None

Implement this method to fetch or create intermediate data structures before the overlay is drawn that don’t require immediate access to the WebGL rendering context. This method must be implemented to render.

onContextLost()

Parameters:  None

Return Value:  None

This method is called when the rendering context is lost for any reason, and is where you should clean up any pre-existing GL state, since it is no longer needed.

onContextRestored(options)

• options:  WebGLStateOptions that allow developers to restore the GL context.

Return Value:  None

This method is called once the rendering context is available. Use it to initialize or bind any WebGL state such as shaders or buffer objects.

onDraw(options)

• options:  WebGLDrawOptions that allow developers to render content to an associated Google basemap.

Return Value:  None

Implement this method to draw WebGL content directly on the map. Note that if the overlay needs a new frame drawn then call

.

onRemove()

Parameters:  None

Return Value:  None

This method is called when the overlay is removed from the map with WebGLOverlayView.setMap(null), and is where you should remove all intermediate objects. This method must be implemented to render.

onStateUpdate(options)

• options:  WebGLStateOptions that allow developerse to restore the GL context.

Return Value:  None

Implement this method to handle any GL state updates outside of the render animation frame.

requestRedraw()

Parameters:  None

Return Value:  None

Triggers the map to redraw a frame.

requestStateUpdate()

Parameters:  None

Return Value:  None

Triggers the map to update GL state.

setMap([map])

• map:  Map optional The map to access the div, model and view state.

Return Value:  None

Adds the overlay to the map.

google.maps.WebGLDrawOptions interface

Drawing options.

google.maps.WebGLStateOptions interface

GL state options.

google.maps.CoordinateTransformer interface

This interface provides convenience methods for generating matrices to use for rendering WebGL scenes on top of the Google base map.

Note: A reference to this object should not be held outside of the scope of the encapsulating WebGLOverlayView.onDraw call.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-07-09 UTC.

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