Struggling to find a way to detect when an element goes off screen, can someone provide guidance? My project utilizes WebGL along with Three.js.
Struggling to find a way to detect when an element goes off screen, can someone provide guidance? My project utilizes WebGL along with Three.js.
If you're looking to test for visibility using Frustum, you can implement it in your code like this:
// Initialize a new Frustum object (for optimization purposes, create only once)
var frustum = new THREE.Frustum();
// Helper matrix (for optimization purposes, create only once)
var projScreenMatrix = new THREE.Matrix4();
// Set the matrix from camera matrices (which are updated during each renderer.render() call)
projScreenMatrix.multiply( camera.projectionMatrix, camera.matrixWorldInverse );
// Update the frustum
frustum.setFromMatrix( projScreenMatrix );
// Check for visibility
if ( !frustum.contains( object ) ) {
// Object is not visible on screen!
}
This example was adapted from the WebGLRenderer sources on GitHub.
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