| origin | @param origin Стартовая точка фигуры в 2D пространстве. |
| direction | @param direction Вектор, представляющий направление фигуры. |
| distance | Maximum distance over which to cast the ray. |
| layerMask | @param layerMask Фильтр для обнаружения коллайдеров только на определённых слоях. |
| minDepth | @param minDepth Включает только объекты с координатой Z (глубиной) выше, чем это значение. |
| maxDepth | @param maxDepth Включает только объекты с координатой Z (глубиной) меньше, чем это значение. |
RaycastHit2D The cast results returned.
Casts a ray against colliders in the scene.
BoxCast, концептуально, это как протягивание коробки сквозь сцену в определенном направлении. Любой объект, вступающий в контакт с коробкой, может быть обнаружен и зарегистрирован.
This function returns a RaycastHit object with a reference to the collider that is hit by the ray (the collider property of the result will be NULL if nothing was hit). The layerMask can be used to detect objects selectively only on certain layers (this allows you to apply the detection only to enemy characters, for example).
Raycasts are useful for determining lines of sight, targets hit by gunfire and for many other purposes in gameplay.
Additionally, this will also detect Collider(s) at the start of the ray. In this case the ray is starting inside the Collider and doesn't intersect the Collider surface. This means that the collision normal cannot be calculated in which case the collision normal returned is set to the inverse of the ray vector being tested. This can easily be detected because such results are always at a RaycastHit2D fraction of zero.
See Also: LayerMask class, RaycastHit2D class, RaycastAll, Linecast, DefaultRaycastLayers, IgnoreRaycastLayer, raycastsHitTriggers.
using UnityEngine; using System.Collections;
public class ExampleClass : MonoBehaviour { public float floatHeight; public float liftForce; public float damping; public Rigidbody2D rb2D; void Start() { rb2D = GetComponent<Rigidbody2D>(); } void FixedUpdate() { RaycastHit2D hit = Physics2D.Raycast(transform.position, -Vector2.up); if (hit.collider != null) { float distance = Mathf.Abs(hit.point.y - transform.position.y); float heightError = floatHeight - distance; float force = liftForce * heightError - rb2D.velocity.y * damping; rb2D.AddForce(Vector3.up * force); } } }