The picture below is my simulation, and the problem im facing is that they wont collide they way i want to.
I made them move randomly and i want this behavior.
The green balls are supposed to "bounce" off the outer grey walls, so collide with them (simulate physics)
The green balls are NOT supposed to bounce of each other, but only do triggerevents (so i know when they are on top of each other)
How do i do this. I have looked at multiple tutorials and i simply dont know what to do. As far as i understand, to make a collision, one of the objects has to have a rigidbody on, and the other a normal collider?
I have to tried to follow this overview. The balls are from the same prefab, so to get a trigger for them i have to pick either
static trigger collider, rigidbody collider trigger, or kinematic rigidbody trigger collider (as seem from the overview).
BUT if i pick any of those i cant get a collision with the walls? Do i have to do the wall collisions myself?
What you can do is make all the walls static colliders, and make a script on all the balls that check whether they hit a wall or a ball. and do actions that way.
Or
Make the walls check for a collision with the ball and add a force to the negative direction that they came from or something.(up to you how you want the balls to behave)
for example :
OnTriggerEnter(collision other)
if(other.transform.tag == Ball)
//Run Some Code here
// for example
BallRb other.GetComponent<RigidBody>();
BalRb.addForce //add the force that you want.
Related
I decided to make a 2D game for the PC on Unity, where the character moves around the stage. But I have a problem with the correct use of Rigid Body 2D.
In this picture you can see my playing field.
https://i.stack.imgur.com/PBhwx.png
I want my character to move around the entire field and when colliding with objects does not go through them.
My field is Tilemap, but I hung the Box Collider on the Grid. Boxing collider surrounds the grid.
But when I use Rigid Body and turn on the game, the object falls through. And if you remove the Rigid Body, then it just goes through objects.
I tried to use different types of Rigid Body, when using kinematic and static, sprite goes through houses.
The way it works is when you attach a RigidBody2D to an object, you give it physics properties, but it won't do anything useful without a collider. If you have an object with collider attached - every other object with collider attached will collide with it.
In your case the player should have RigidBody2D and BoxCollider2D. The ground should have BoxCollider2D, and basically everything you want the player to collide with should have BoxCollider2D. So the houses should have BoxCollider2D as well.
This setup should allow the player to walk on the ground without falling through it, and collider with houses.
Make sure that the collider's area is correct. You can preview it in the editor and edit it if it's not correct.
Also if you want it to work make sure the camera points down and your game setup is alongside Y axis so if there's a rigid body object falling down it falls down on the ground not before/behind it.
I have a bullet game object and an enemy game object.
I want to have the ability of getting the collision point/contact, which's why I think I need the collider of the bullet to not be a trigger collider - this way, I want to have the bullet bounce off the enemy. At times, the bullet will need to bounce off of rectangular objects (not a problem), but I also want the bullet to bounce off of elliptic objects (the problem).
I want the bullet not to "physically" push the enemy, which is why, intuitively, I should set the bullet's collider to be a trigger collider.
When the bullet's collider is a trigger collider, I seemingly don't have a way to implement the bouncing.
But when the collider's not a trigger collider, it pushes the enemy object.
There's no code errors, but I think the code hasn't got anything to do with the problem.
I suspect the problem may have something to do with the Physics Collision Matrix.
EDIT
It seems that raycasting would be the solution to the problem, as Leoverload proposed. My problem became a different problem now, so I'll close off this thread, and open a new one.
Thanks for the help, #Leoverload ! :D
For the position of the hit it's very easy. You must have 2 colliders and 2 Rigidbody and then you can simply add a
Void OnTriggerEnter2D(Collision Coll) and inside it check for the tag : if(coll.compareTag("surface")) and inside you can get the position with collision.transform.position.
The collision matrix on the Physics menu only allows to remove Collision between certain layers, it's useful if you want the enemies not to push eachother!
If you don't want the player pushed you can change the collider to trigger, and destroy the bullet just after the collision with the same method as before with a void OnTriggerEnter2D and the compareTag. In this way it will look like it touches the enemy and explode, but it won't actually touch anything. If you want to add knockback to the player then you could do a simple AddForce based on the direction of the bullet and the work is done!
If you want to avoid the bullet to move walls you can set walls to static and it should work fine
I'm doing a platformer and I have colliders and rigid bodies in my hero and my enemies. I have also colliders on my platforms.
Everything works and moves nice, dudes move along the platforms, they jump and they catch each other.
I use the collider in my enemies to discover if the hero touches them and then deal damage to the hero. And when slashing I use "overlapCicle" to discover if the sword touched the enemies.
My problem is that with this setup my hero and my enemies can walk one in the top of others. Additionally if I disable the collider of an enemy (to make it invulnerable for a second after being hit) it will fall through the platform..
What's the best approach to this structure of colliders? I want everybody to walk over platforms. I want enemies colliders to detect the hero touching them and I want my sword (overlapcircle) to find enemies. And I want hero and enemies to be able to walk across each other, specially enemies.. they should not walk one over the others
Seems like you want the enemy and the player to be able to walk through each other, while being able to interact with each other.
In that case, you can create another physics layer for your interactions (attacking or vision detection), and set-up your Physics layers to ensure that the Player and Enemy do not collide, but their interaction layers can collide with the respective characters.
Like so:
Where PlayerTriggers and EnemyTriggers will be physics layer for interaction between the enemy/player.
This ensures that the enemy's vision/attack collider can hit the player, but the enemy itself can't do so. Vice versa.
To access the physics layer menu, go to Edit (Top left) and click on Project Settings.
You can read more about it in Unity's Doc.
Currently I'm making a racing game.
I move my cars with the Transform.translate class.
Now the thing I want for my cars is not to move through each other.
I attach colliders and a RigidBody to my player car and it's working.
But my problem is that each time my CPU cars and player car encounter with each other, my player car shows unrealistic behavior like moving out of the screen or throwing away.
I know this is part of the physics engine behavior but is there a way to make the RigidBody only do one job and make objects not to move through each other not to add other physics behavior?
Any ideas?
There are just few problems:
1.You don't move Rigidbody with transform.translate. When you do this, colliders will go through other colliders.
You move Rigidbody with Rigidbody.AddForce, Rigidbody.velocity and Rigidbody.MovePosition. By moving Rigidbody with these methods, collision should be functioning properly.
2.You are not even supposed to move the Rigidbody of the car.
Use WheelCollider. There are many online tutorials on how to set them up on the internet but Unity's documentation is fine too.
WheelCollider.motorTorque is used to move the car forward or backwards.
WheelCollider.steerAngle is used to steer the car.
WheelCollider.brakeTorque is used to brake the car.
If you need further help, you can find a fully working WheelCollider samples here.
I'm using Unity and i am doing a pong game. I would like to be able to move the paddles with the mouse key. I have tried just moving their position but that of course will simply "teleport" them through the colliders along the edge of the playing field. I tried using addForce() and making the rigidbody fixed in the x position, however, what happens is when the ball hits the paddle, it pushes it and the paddle snaps back. All of the ball's energy is lost (there is gravity in my game). How can i move this box collider but not let it over lap other box colliders while moving? Thanks!!!
Your paddle should be a kinematic (IsKinematic parameter) rigidbody (attached RigidBody2D) collider while the edges should just be a static collider. But, you should control the limits/edges of paddle movement within your script.
If you do things this way, your ball will naturally bounce of the edges and off your paddle. If, however, you want the ball to pass through the edges but notify you of doing so (e.g. lose condition), you should make the edges a static trigger collider (IsTrigger parameter).
Here's a detailed list with all interactions between different types of colliders: http://docs.unity3d.com/Manual/CollidersOverview.html. The messages generated are passed via 2 different functions: OnTriggerEnter2D and OnCollisionEnter2D.