I had this working just fine until I decided I wanted to change how I organized the colliders just a few minutes ago to avoid having multiple colliders on the same object.
I have a "Player" object with a boxCollider2d with isTrigger=false and an empty child called "triggers" which itself has 2 children, each with a single boxCollider2d and both with isTrigger=true. These triggers are used for detecting when the player is grounded or next to a wall but are not supposed to affect the physics.
I also have a "floor" object which has a sprite and an empty child called "colliders" which has a single child called "ground" with a single boxCollider2d (isTrigger=false) and the layer of the object set to "Ground".
My understanding is that since my player has a non-trigger collider (and rigidbody) and the floor has a non-trigger collider (at least its child does), that the character shouldn't pass through the floor. Also, it's starting from a height above the ground so it's not an intersection problem.
My best guess is that somehow the child colliders of the player being triggers are turning the main collider into a trigger or that for some reason the floor collider being in a child is screwing with it, but I don't know enough about how these colliders work to really know.
The child trigger colliders should not cause it to mess up like that.
Check Project Settings -> Physics 2D -> Layer Collision Matrix. Are your objects not able to collide?
Related
Have Mesh Colliders on everything except the Solider being a child of the Game Object renamed Player.
The Player has a Character Contoller surrounding the child or blue-colored soldier. In Game Play, he falls halfway through the road and gets stuck in Unity. Is there a fix for this????
I noticed the Unity forum had not answered a similar question about it since 2019.
Colliders
Make sure that the actual model / mesh of your character has a mesh collider applied to it and that the convex box is checked. Next make sure that your ground / whatever your character lands on has a collider attached to it whether this collider is of type mesh, box or really any collider it shouldn't matter but I'd recommend trying a cube with a box collider first. Also make sure that all of your mesh colliders actually have a mesh applied to them.
For your character controller double check that the size of it matches your characters model in both width and height. Apply the actual Character Controller to the Parent game object in your case named Player and apply the mesh collider to your actual character.
Some Images of how it should look when correctly set up
How the parent "Player" should be set up simply
How the actual character should be set up simply
How your ground should be set up simply
In Unity3D, you need rigidbodies on GameObjects that use colliders, as they use physics. You don't need rigidbodies on static GameObjects because they don't use physics, though you still need to have at least one in the calculation.
My situation is this: I want the game to detect putting your head through a wall with colliders. I'm just curious, as the collider on the head won't use physics, does it still need a rigidbody as it's moving, just not with physics?
My question is: Does a VR object need a rigidbody? (and yes it set it to kinematic)
Colliders → Collision action matrix
=> It depends.
Some of the combinations only cause one of the two objects to be affected by the collision, but the general rule is that physics will not be applied to an object that doesn’t have a Rigidbody component attached.
You said
as the collider on the head won't use physics
But note that in general Collision = Physics.
So yes, at least one of the objects involved in a collision needs to be a (kinematic) Rigidbody.
As you can see in the matrix above e.g. for a collision with a static object the event (like OnCollisionEnter) will be invoked only on the object with a (kinematic o not) Rigidbody but not on the static object.
static here means it has no Rigidbody component attached even if it is moved by code or in other words: As soon as something moves in your scene it should have a (kinematic) Rigidbody component!
You can add colliders to a GameObject without a Rigidbody component to create floors, walls and other motionless elements of a Scene. These are referred to as static colliders. At the opposite, colliders on a GameObject that has a Rigidbody are known as dynamic colliders.
The Problem: Mesh colliders on some rigidbody objects are passing through colliders on other objects.
Things I have tried:
With the assumption A is a GameObject with a RigidBody attached and B is a normal GameObject with a collider.
Give A a convex mesh collider
Give A a non-convex mesh collider
Give B a convex mesh collider
Give B a non-convex mesh collider
give B a box collider
give B a convex mesh and box collider
give B a non-convex mesh and box collider
Adjusting the weight of the rigidbody
I have tried all of these in all combinations of A and B.
In addition,
Colliders are not marked as triggers
All objects are on the default layer (0)
Checking isKinematic; doing this seemed to make gravity stop affecting the object, so I have left it as false.
Constraints: I want A to use a mesh collider since most of the objects involved are moderately complex, and fitting other colliders to them would take a while.
Weird Behaviour: I have some objects with both rigidbody and convex mesh collider where the collision is working fine with a non-convex mesh collider. This is inconsistent with other gameobjects. The objects have all of the same settings.
I am using unity version 2019.3.11f1 if that is relevant.
The object being used are from this package. Specifically, the filing cabinet with rigidbodies on the drawers works fine. The desk, office chair, pen, and open laptop all fall through the "floor" (a cube with all of the above colliders tested on it).
Do you have 'isKinematic' checked on the objects with rigidbodies that are going through other colliders? If so uncheck it so that external forces affect it.
edit you also need to click convex on the mesh colliders if they are colliding with other mesh colliders, Convex Mesh Colliders are limited to 255 triangles, are the objects that are not passing through have more than 255 triangles in geometry?
I am Assuming you have set your Collision Detection to Discrete In your gameObject's RigidBody, if so, please make sure to select Collision Detection to Continuous In your gameObject's RigidBody.
Reason Why this is not working
You are trying to use collision that has (speed > your Computer's frame speed) so, the frame is not catching the collider properly some time catches and some time fails to catch.
You are moving your GameObjects with tranform.translate or position etc. If so then make sure to use Rigidbody Related function for Positioning, rotating.
Solution Image For First Problem
I'm assuming
-you game object which contain the mesh component is very small ( bellow 0.7 size(x,y,z) so the game engine is little difficult to detect it)
and also
for the colliding objects at-least one rigid-body component must be attach to one object
This seems to be a common big problem, and I have been struggling with the same issue for days, and have finally fixed it, so am feeling like I should highlight one important thing:
move Rigidbody via MovePosition, not via just changing its position field directly, nor via changing position of GameObject holding it.
Changing position via "wrong" ways will "teleport" your rigidbody, physics won't fully work on it in that case.
I have a GameObject, constructed from bunch of pills, where each pill is basically constructed from two spheres and a cylinder.
So the GameObject hierarchy looks something like this:
Player (Empty GameObject)
Pill (Empty Game Object)
Sphere (3D sphere)
Cylinder (3D cylinder)
Sphere (3D sphere)
Hopefully the picture will give you guys the visual illustration of what the GameObject looks like:
Now, my goal is to have the entire GameObject - Player as a Rigidbody, while I would like to detect collision on Pill level. Hence I added Rigidbody to Player and Capsule collider to each Pill. However such configuration does not work - the Pill does not receive OnCollisionEnter event. I found suggestion solution, however it does not work for me either - if I set Capsule collider property Is Trigger, then Player does not interact with other Rigid bodies. The only solution I found so far is to add Rigidbody to each Pill, but I am concerned about performance is such scenario.
To sum up - my question is - can I have the above configuration - parent rigid body, child collider work and accept OnCollision events? Of course if I can have parent rigid body and a child with Is Trigger set will also work in case the Player keeps rigid body physics behavior.
I don't know why you want to detect collision on Pill Level but retaining the same configuration one thing you can access is the Collision ContactPoint.
I am developing an oculus Home like project where i am facing a problem of object passes through walls and other objects. The scene is described as, Ialt texthave an object that has Box Collider and an Rigidbody (Gravity false , Kinematic true) A wall and a Floor with Box Collider and Rigidbody(Gravity false , Kinematic False) I am moving an object with hands movement. Translate object near and far using thumbstick, the problem is that when i move object far the object pass through the wall and floor. As you can see in the image below the object is passing through in the walls and the floor. Please help me and suggest a better solution. Thanks in advance.
the idea behing Kinematic objects is that interaction with Physics will not alter their transforms, so they will pass through other static or kinematic objects. To alter that you can either not use Kinematic rb's or detect collisions manually and adjust for collision results
I think you have one of your collider's Is Trigger set to true.
If the collider on your object has the Is Trigger property set to true then the collider will pass through other colliders but if it's not a trigger then it'll always collide with other non-trigger colliders. So as long as you have two non-trigger colliders they'll always collide no matter the rigid-body and if you need the Is Trigger property set to true there's a workaround you can use two types of colliders on a single object one a trigger and another a non-trigger preferably a Mesh Collider (so the trigger collider will have space to be triggered).