Is there a way to handle events for geometries, cameras, and lights that are added to a scene in three.js?
I tried searching on Google but didn't find any relevant information. I attempted to inspect the contents of a simple Sphere rendering using firebug, but only found one canvas element. Adding an onclick event to the canvas applies to all canvas elements rather than just the specific sphere or light.
Any recommendations for how to achieve this?
To achieve interactivity in a 3D environment, you will need to follow these steps:
Although it may seem complex, the necessary code has already been provided:
function onDocumentMouseDown( event ) {
event.preventDefault();
var vector = new THREE.Vector3( ( event.clientX / window.innerWidth ) * 2 - 1, - ( event.clientY / window.innerHeight ) * 2 + 1, 0.5 );
projector.unprojectVector( vector, camera );
var ray = new THREE.Ray( camera.position, vector.subSelf( camera.position ).normalize() );
var intersects = ray.intersectObjects( objects );
if ( intersects.length > 0 ) {
intersects[ 0 ].object.material.color.setHex( Math.random() * 0xffffff );
var particle = new THREE.Particle( particleMaterial );
particle.position = intersects[ 0 ].point;
particle.scale.x = particle.scale.y = 8;
scene.add( particle );
}
/*
// Parse all the faces
for ( var i in intersects ) {
intersects[ i ].face.material[ 0 ].color.setHex( Math.random() * 0xffffff | 0x80000000 );
}
*/
}
The code snippet above is extracted from the canvas_interactive_cubes example provided within the library. When facing difficulties, always refer to existing examples that might offer a solution.
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