raycast method

void raycast(Raycaster raycaster, List<Intersection> intersects)

Get intersections between a casted ray and this mesh. Raycaster.intersectObject will call this method, but the results are not ordered.

Implementation

void raycast(Raycaster raycaster,List<Intersection> intersects ) {
    final material = this.material! as LineMaterial;

	final worldUnits = material.worldUnits;
	final camera = raycaster.camera;

	if(worldUnits == null) {
		console.error( 'LineSegments2: "Raycaster.camera" needs to be set in order to raycast against LineSegments2 while worldUnits is set to false.' );
	}

	final threshold = ( raycaster.params['Line2'] != null ) ? raycaster.params['Line2']['threshold'] ?? 0 : 0;

	_ray = raycaster.ray;

	final matrixWorld = this.matrixWorld;
	final geometry = this.geometry!;


	_lineWidth = material.linewidth! + threshold;

	// check if we intersect the sphere bounds
	if ( geometry.boundingSphere == null ) {
		geometry.computeBoundingSphere();
	}

	_sphere.setFrom(geometry.boundingSphere!).applyMatrix4( matrixWorld );

	// increase the sphere bounds by the worst case line screen space width
	late double sphereMargin;
	if ( worldUnits == true){
		sphereMargin = _lineWidth * 0.5;
	}
    else {
		final distanceToSphere = math.max( camera.near, _sphere.distanceToPoint( _ray.origin ) );
		sphereMargin = getWorldSpaceHalfWidth( camera, distanceToSphere, material.resolution );
	}

	_sphere.radius += sphereMargin;

	if ( _ray.intersectsSphere( _sphere ) == false ) {
		return;
	}

	// check if we intersect the box bounds
    if(geometry.boundingBox == null){
	  geometry.computeBoundingBox();
    }
	_box.setFrom( geometry.boundingBox! ).applyMatrix4( matrixWorld );

	// increase the box bounds by the worst case line width
	late double boxMargin;
	if ( worldUnits == true) {
		boxMargin = _lineWidth * 0.5;
	}
    else {
		final distanceToBox = math.max( camera.near, _box.distanceToPoint( _ray.origin ) );
		boxMargin = getWorldSpaceHalfWidth( camera, distanceToBox, material.resolution );
	}

	_box.expandByScalar( boxMargin );

	if ( _ray.intersectsBox( _box ) == false ) {
		return;
	}

	if ( worldUnits == true) {
		raycastWorldUnits( this, intersects );
	}
    else {
		raycastScreenSpace( this, camera, intersects );
	}
}