/// <summary>
/// Returns a list of game objects which are visible to the specified camera.
/// </summary>
/// <remarks>
/// This function detects only objects which have a collider attached to them.
/// </remarks>
public static List <GameObject> GetVisibleGameObjects(this Camera camera)
{
// We need the camera view volume to detect the visible game objects
var cameraViewVolume = new CameraViewVolume();
cameraViewVolume.BuildForCamera(camera, camera.farClipPlane);
// In order to detect the visible game objects, we will loop through all POTTENTIALLY visible
// game objects and check if their AABB lies inside the camera frustum.
List <GameObject> pottentiallyVisibleGameObjects = camera.GetPottentiallyVisibleGameObjects();
var visibleGameObjects = new List <GameObject>(pottentiallyVisibleGameObjects.Count); // Set initial capacity to avoid resize
foreach (GameObject gameObject in pottentiallyVisibleGameObjects)
{
// If the game object's world space AABB intersects the camera frustum, it means it is visible
Box worldSpaceAABB = gameObject.GetWorldBox();
if (worldSpaceAABB.IsInvalid())
{
continue;
}
if (cameraViewVolume.ContainsWorldSpaceAABB(worldSpaceAABB.ToBounds()))
{
visibleGameObjects.Add(gameObject);
}
}
// Return the visible objects list to the caller
return(visibleGameObjects);
}
public static bool IsGameObjectVisible(this Camera camera, GameObject gameObject)
{
var cameraViewVolume = new CameraViewVolume();
cameraViewVolume.BuildForCamera(camera, camera.farClipPlane);
Box worldSpaceAABB = gameObject.GetWorldBox();
if (worldSpaceAABB.IsInvalid())
{
return(false);
}
return(cameraViewVolume.ContainsWorldSpaceAABB(worldSpaceAABB.ToBounds()));
}
