cesiumjs-interaction

Handle mouse clicks and hovers on a CesiumJS scene by using ScreenSpaceEventHandler to register input events on the viewer canvas, combined with scene picking APIs to identify interacted entities.

In CesiumJS, pick identifies the topmost object at a screen position, drillPick retrieves all objects at that position, and pickPosition converts the screen coordinates to exact world coordinates for precise interaction.

To select and drag 3D Tiles and entities in CesiumJS, attach a ScreenSpaceEventHandler to monitor mouse movement and click events, then apply drag-based interaction patterns using the picking APIs to manipulate the selected objects.

Yes, ScreenSpaceEventHandler supports touch and pointer events on the Cesium canvas, enabling interactive user input for mobile scenes. It integrates with picking APIs to identify entities, terrain, and 3D Tiles during mobile interactions.

Yes, you can use pickAsync in CesiumJS v1.139 ES module workflows to asynchronously identify terrain and 3D Tiles. It works alongside pick, drillPick, and pickPosition for responsive scene interaction and feature inspection.

Scene picking returns undefined during hover events when no entity or tile exists at the picked screen position. Ensure the ScreenSpaceEventHandler is attached to the viewer canvas and the picking API correctly targets the interacted scene objects.