visible method

bool visible(Vector3 point)

Performs a line of sight test in order to determine if the given point in 3D space is visible for the game entity.

Implementation

bool visible(Vector3 point ) {
	final owner = this.owner;
	final obstacles = this.obstacles;

	owner?.getWorldPosition( worldPosition );

	// check if point lies within the game entity's visual range

	toPoint.subVectors( point, worldPosition );
	final distanceToPoint = toPoint.length;

	if ( distanceToPoint > range ) return false;

	// next, check if the point lies within the game entity's field of view

	owner?.getWorldDirection( direction );

	final angle = direction.angleTo( toPoint );

	if ( angle > ( fieldOfView * 0.5 ) ) return false;

	// the point lies within the game entity's visual range and field
	// of view. now check if obstacles block the game entity's view to the given point.

	ray.origin.copy( worldPosition );
	ray.direction.copy( toPoint ).divideScalar(distanceToPoint != 0?distanceToPoint: 1); // normalize

	for ( int i = 0, l = obstacles.length; i < l; i ++ ) {
		final obstacle = obstacles[ i ];
		final intersection = obstacle.lineOfSightTest( ray, intersectionPoint );

		if ( intersection != null ) {
			// if an intersection point is closer to the game entity than the given point,
			// something is blocking the game entity's view
			final squaredDistanceToIntersectionPoint = intersectionPoint.squaredDistanceTo( worldPosition );
			if ( squaredDistanceToIntersectionPoint <= ( distanceToPoint * distanceToPoint ) ) return false;
		}
	}

	return true;
}