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This function will take the Collider shape and cast it into the Scene starting at the Collider position in the specified direction for an optional distance and return the results in the provided results list.

Unity

discussions.unity.com › unity engine

Why does Collider2D.Cast exist, but not Collider.Cast? - Unity Engine - Unity Discussions

October 27, 2019 - This exists for Collider2D: Unity - Scripting API: Collider2D.Cast However for some unspecified reason which also appears to be unknown to google, Collider’s (the 3D ones) do not have a similar method. I suppose casting mesh colliders could be a performance ...

Discussions

Why does Collider2D.Cast exist, but not Collider.Cast? - Unity Engine - Unity Discussions

This exists for Collider2D: Unity - Scripting API: Collider2D.Cast However for some unspecified reason which also appears to be unknown to google, Collider’s (the 3D ones) do not have a similar method. I suppose casting mesh colliders could be a performance ... More on forum.unity.com

forum.unity.com

2

October 27, 2019

How do I use ColliderCast properly? - Unity Engine - Unity Discussions

I am trying to convert a raycast vehicle system to use cylinder colliders for the wheels. I cannot figure out how to get the collider from the GO hierarchy and then use it in the physics system. I have my vehicle wheels set up as in the Unity ECS Raycast Vehicle Demo (Vehicle → Suspension ... More on forum.unity.com

forum.unity.com

2

November 7, 2021

Collider or Cast?

You forgot a fairly important detail.... 2D or 3D?

Anyway, I would use box colliders and utilize the ContactPoint property for hit direction detection. Box colliders are easy to scale etc to fit your dynamic models. No need to make it more complicated than it has to be.

Sphere/box/etc-casts are good for temporary, fixed, rare-isch events. Such as checking if something is in the vicinity when pressing a button(like for example, a hand, and you press "grab", do a cast and check if anything grabbable is in vicinity).

Videos

youtube.com

Colliders And Rigidbodies in Unity - YouTube

September 25, 2024

youtube.com

From Beginner to Pro: Mastering Unity's Colliders - YouTube

July 28, 2023

youtube.com

🔴 Creating Complex Colliders • Physics • Unity Game Dev ...

July 8, 2022

13:34

YouTube

Unity Mesh Collider - Unity Physics System Tutorial 07 - YouTube

Unity Collider 2D | Unity 2D Tutorials for Beginners! - YouTube

Unity For Beginners - Rigidbody and Collider - YouTube

July 28, 2023

View all

Unity

discussions.unity.com › unity engine

How to collider cast in a direction until hitting an object? - Unity Engine - Unity Discussions

June 4, 2023 - Example: How can I cast my object to the right until it detects another object, and right when it touches it, it returns the position it’s in? I tried Collider2D.Cast() but it returns the point where it hit. I need to h…

Unity

docs.unity.cn › 560 › Documentation › ScriptReference › Collider2D.Cast.html

Unity - Scripting API: Collider2D.Cast

Casts the collider shape into the scene starting at the collider position ignoring the collider itself.

YouTube

youtube.com › watch

Collider.Cast | The Best Easy Way to Check for Collisions - Unity 2018 Tutorial - YouTube

04:06

► My Unity 2020 Mini-Course - Make a 2D Platformer Character with State Machines ►https://skl.sh/3lpWPQL◢◤◣◥◢◤◣◥◢◤◣◥◢◤◣◥Use Collider.Cast(Position, Filter, H...

Published June 30, 2018

Unity

docs.unity3d.com › Packages › com.unity.physics@0.3 › manual › collision_queries.html

Collision queries | Unity Physics | 0.3.2-preview

Unity Physics has a powerful collision query system which supports queries like ray casting, linear casting and closest point estimation. These queries support options like efficient collision filtering and user data retrieval. Queries can be performed against individual colliders or against ...

Unity

forum.unity.com › unity engine

How do I use ColliderCast properly? - Unity Engine - Unity Discussions

November 7, 2021 - I am trying to convert a raycast vehicle system to use cylinder colliders for the wheels. I cannot figure out how to get the collider from the GO hierarchy and then use it in the physics system. I have my vehicle wheels set up as in the Unity ECS Raycast Vehicle Demo (Vehicle → Suspension → Wheel → Wheel Graphic) and have added a Physics Shape to the wheel graphic: In my GameObjectConversionSystem script I create a Cylinder Collider: var wheelAuthoring = wheelRepresentation.GetComponent

reddit.com › r/unity3d › collider or cast?

r/Unity3D on Reddit: Collider or Cast?

June 13, 2023 -

I am making a game that's in a way sort of like Mario where you cannot damage enemy's with a sword or any of that but only by stomping on them. As well as the power ups that can shoot projectiles and make the PLAYER model different.

I want to know what is a better solution for collision for this type of game, currently I am using Box Casts, Overlap Circles, etc. I find that this solution works but if I change the character model it goes and becomes a NIGHTMARE. I then opted for a better solution which was Colliders (I'm not sure if it is the best solution) and they make it way easier to modify.

Just a bit of background to what I used the Casts for were things such as, creating a Cast for the Lucky Blocks, creating a Cast to check if the feet of the PLAYER touched the enemy's head, creating a Cast to collect Coins, and more.

I am making this thread so that I can understand how to use Casts, because of now I am either using colliders for triggers or just casts which I usually use Casts. Please just let me know how Casts should be used and how Colliders should be use. As well as for my type of Mario like Game which would be better to use in the Long Run.

Thank you in Advanced 😃

Top answer

1 of 1

2

Here's the solution as proposed by @DMGregory.

The key is to use the collider itself for the .Cast instead of the rigidbody

Old code - irrelevant parts omitted

private Rigidbody2D rb;

void Start()
{
  rb = GetComponent<Rigidbody2D>();
}

private bool HasCollision(Vector2 direction)
{
  int count = rb.Cast(
    direction,
    movementFilter,
    collisions,
    collisionOffset
  );

  return count > 0;
}

New code - irrelevant parts omitted:

private Rigidbody2D rb;
private Collider2D collider;

void Start()
{
  rb = GetComponent<Rigidbody2D>();
  collider = GetComponent<Collider2D>();
}

private bool HasCollision(Vector2 direction)
{
  // Here's the key change!
  int count = collider.Cast(
    direction,
    movementFilter,
    collisions,
    collisionOffset
  );

  return count > 0;
}

This works, but it'd be still great to hear about a solution solely based on nested objects and layers. The use case would be to allow for composite colission shapes without resorting to something like a foreach where every step in the iteration does a .Cast.

Unity

docs.unity3d.com › ScriptReference › Collider.html

Unity - Scripting API: Collider

If the object with the Collider needs to be moved during gameplay then you should also attach a Rigidbody component to the object. The Rigidbody can be set to be kinematic if you don't want the object to have physical interaction with other objects. Is something described here not working as you expect it to? It might be a Known Issue. Please check with the Issue Tracker at issuetracker.unity3d.com.Copyright ©2005-2026 Unity Technologies.

Stack Overflow

stackoverflow.com › questions › 49973372 › why-collider2d-raycast-collider-raycast-are-so-different

unity game engine - Why Collider2D.Raycast & Collider.Raycast are so different? - Stack Overflow

Collider.Raycast -> Casts a Ray that ignores all Colliders except this one. Collider2D.Raycast -> Casts a ray into the scene starting at the collider position ignoring the collider itself. I want...

Learntocreategames

learntocreategames.com › collision-detection

Collision Detection in Unity Explained (i.e., Colliders, Triggers and Ray-casting) | Learn to Create Games

We cast a ray using the keyword RayCast. The method RayCast takes three parameters: the ray (rayFromPlayer), an object where the information linked to the collision between the ray and another collider is stored (hit), and the length of the ray (100).

Unity

forum.unity.com › unity engine

Boxcast returns itself as the collider - Unity Engine - Unity Discussions

February 12, 2022 - So I’m trying to make a “sense nearby objects” function. I put a for loop and do boxcasting at angles, so that it would for example cast at every 30 degrees all around the object. If another object hits it’s range (determined by the distance param of the boxCast funtion), then I do ...

Unity

docs.unity3d.com › Manual › CollidersOverview.html

Unity - Manual: Introduction to collision

To handle collision between GameObjects, Unity uses colliders. A collider is a Unity component that defines the shape of a GameObject for the purposes of physical collisions.

reddit.com › r/unity2d › is collider2d.cast even usable?

r/Unity2D on Reddit: Is Collider2d.Cast even usable?

October 31, 2022 -

Casting a Collider2d perpendicularly downward into horizontal surface should result in RaycastHit2D.point being RaycastHit2D.distance from the lowest point of the collider, but it doesn't (even accounting for the contact offset). Changing the cast distance is resulting in different hit distances, when it shouldn't. Collider2d.Cast just doesn't seem to return results anywhere near accurate enough to be of any use. Am I doing something wrong?