public static method Raycast(origin:
Vector2,
direction: Vector2,
distance: float = Mathf.Infinity,
layerMask: int = DefaultRaycastLayers,
minDepth: float = -Mathf.Infinity,
maxDepth: float = Mathf.Infinity):
RaycastHit2D;

public static RaycastHit2D Raycast(Vector2 origin,
Vector2 direction,
float distance = Mathf.Infinity,
int layerMask = DefaultRaycastLayers,
float minDepth = -Mathf.Infinity,
float maxDepth = Mathf.Infinity);

origin | The point in 2D space where the ray originates. |

direction | The vector representing the direction of the ray. |

distance | Maximum distance over which to cast the ray. |

layerMask | Filter to detect Colliders only on certain layers. |

minDepth | Only include objects with a Z coordinate (depth) greater than or equal to this value. |

maxDepth | Only include objects with a Z coordinate (depth) less than or equal to this value. |

**RaycastHit2D**
The cast results returned.

Casts a ray against colliders in the scene.

A *raycast* is conceptually like a laser beam that is fired from a point in space along a particular direction. Any object making contact with the beam can be detected and reported.

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).

Overloads of this method that use `contactFilter`

can filter the results by the options available in ContactFilter2D.

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.

// Float a rigidbody object a set distance above a surface.

var floatHeight: float; // Desired floating height. var liftForce: float; // Force to apply when lifting the rigidbody. var damping: float; // Force reduction proportional to speed (reduces bouncing).

var rb2D: Rigidbody2D;

function Start() { rb2D = GetComponent.<Rigidbody2D>(); }

function FixedUpdate() { // Cast a ray straight down. var hit: RaycastHit2D = Physics2D.Raycast(transform.position, -Vector2.up);

// If it hits something... if (hit.collider != null) { // Calculate the distance from the surface and the "error" relative // to the floating height. var distance = Mathf.Abs(hit.point.y - transform.position.y); var heightError: float = floatHeight - distance;

// The force is proportional to the height error, but we remove a part of it // according to the object's speed. var force = liftForce * heightError - rb2D.velocity.y * damping;

// Apply the force to the rigidbody. rb2D.AddForce(Vector3.up * force); } }

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); } } }

public static method Raycast(origin:
Vector2,
direction: Vector2,
contactFilter: ContactFilter2D,
results: RaycastHit2D[],
distance: float = Mathf.Infinity):
int;

public static int Raycast(Vector2 origin,
Vector2 direction,
ContactFilter2D contactFilter,
RaycastHit2D[] results,
float distance = Mathf.Infinity);

origin | The point in 2D space where the ray originates. |

direction | The vector representing the direction of the ray. |

contactFilter | The contact filter used to filter the results differently, such as by layer mask, Z depth, or normal angle. |

results | The array to receive results. The size of the array determines the maximum number of results that can be returned. |

distance | Maximum distance over which to cast the ray. |

**int**
Returns the number of results placed in the `results`

array.

Casts a ray against colliders in the Scene.

A *raycast* is conceptually like a laser beam that is fired from a point in space along a particular direction. Any object making contact with the beam can be detected and reported.

This function returns the number of contacts found and places those contacts in the `results`

array. The results can also be filtered by the `contactFilter`

.

See Also: ContactFilter2D and RaycastHit2D.

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