In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. Think of each unique Scene file as a unique level. The most common use of a Ray from the camera is to perform a raycast out into the scene A Scene contains the environments and menus of your game. More info See in Glossary rather than the Camera’s transform.position point. See far clipping plane and near clipping plane. A camera’s viewable range is between the far and near clipping planes. The Ray originates from the near clipping plane A plane that limits how far or close a camera can see from its current position. Each of these functions returns a Ray which consists of a point of origin and a vector which shows the direction of the line from that origin. More info See in Glossary coordinate, while ViewportPointToRay takes normalized coordinates in the range 0.1 (where 0 represents the bottom or left and 1 represents the top or right of the view). Pixel lighting is calculated at every screen pixel. Pixel size depends on your screen resolution.

The difference between the two is that ScreenPointToRay expects the point to be provided as a pixel The smallest unit in a computer image. The Ray always corresponds to a point in the view, so the Camera class provides the ScreenPointToRay and ViewportPointToRay functions. It is sometimes useful to have a mathematical representation of that line and Unity can provide this in the form of a Ray object. More info See in Glossary’s view corresponds to a line in world space. The output is either drawn to the screen or captured as a texture. The force is proportional to the height error, but we remove a part of itįloat force = liftForce * heightError - the section Understanding the View Frustum, it was explained that any point in the camera A component which creates an image of a particular viewpoint in your scene. Calculate the distance from the surface and the 'error' relativeįloat distance = Mathf.Abs( - ) įloat heightError = floatHeight - distance RaycastHit2D hit = Physics2D.Raycast(transform.position, - Vector2.up) Public float damping // Force reduction proportional to speed (reduces bouncing). Public float liftForce // Force to apply when lifting the rigidbody. Public float floatHeight // Desired floating height. Float a rigidbody object a set distance above a surface. See Also: LayerMask class, RaycastHit2D class, RaycastAll, Linecast, DefaultRaycastLayers, IgnoreRaycastLayer, raycastsHitTriggers. This can easily be detected because such results are always at a RaycastHit2D fraction of zero.

This means that the collision normal cannot be calculated, in which case the returned collision normal is set to the inverse of the ray vector being tested.

In this case, the ray starts inside the Collider and doesn't intersect the Collider surface. Raycasts are useful for determining lines of sight, targets hit by gunfire and for many other purposes in gameplay.Īdditionally, this will also detect Collider(s) at the start of the ray.

Overloads of this method that use contactFilter can filter the results by the options available in ContactFilter2D. 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). This function returns a RaycastHit2D 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). Any object making contact with the beam can be detected and reported. A raycast is conceptually like a laser beam that is fired from a point in space along a particular direction.

Unity raycast tutorial