The iTwin.js display system provides out-of-the-box support for tiles from a wide variety of sources, but in some cases an application may wish to display their own custom graphics in a Viewport. For relatively simple graphics, view decorations are often an appropriate choice. However, for more complex graphics, the application can instead implement a TiledGraphicsProvider to supply tiles to be rendered as part of the scene.

To register your provider with a viewport, use Viewport.addTiledGraphicsProvider; to unregister it, use Viewport.dropTiledGraphicsProvider. Note that a given provider can be registered with any number of viewports at any given time.

The TiledGraphicsProvider interface defines only three methods, and all but one of these are optional:

Of course, implementing forEachTileTreeRef implies that you will instantiate one or more TileTreeReferences, which in turn means you will probably need to implement subclasses of TileTree and/or Tile. This example provides a sample implementation of a TiledGraphicsProvider capable of animating an "exploded" view of a set of elements.

Last Updated: 30 December, 2021