threejs-core-raycaster

Mouse picking in Three.js uses the raycaster.setFromCamera method with normalized mouse coordinates and the camera reference to detect intersections and enable precise 3D object selection. The skill implements this by calculating intersections against scene meshes to determine which specific object the user clicked.

Three.js raycasting is used for collision detection, hover detection, and line-of-sight checks in interactive 3D applications. It casts an invisible ray from the camera through the mouse pointer to find intersecting objects, enabling real-time scene navigation and game interactions.

Setting up raycasting for VR and AR in Three.js involves initializing the raycaster and passing controller or camera references to detect object collisions. This skill provides the guidelines needed to ensure accurate 3D interaction and spatial collision detection across immersive environments.

Three.js raycasting performance can degrade in complex scenes with high polygon counts if checking every mesh. This skill provides best practices for managing raycasting efficiency, ensuring accurate object selection without causing severe frame rate drops during real-time interactions.

Raycasting should be used for collision detection when you need precise line-of-sight checks, object selection, or hover detection in Three.js. It is ideal for interactive web development and game design where accurate mouse or pointer-based 3D spatial queries are required.