Develop Reference

How to prevent character from going through walls. Unity

I'm new to unity here and I have a capsule for a player and a moving wall. When ever the player touches the wall, it can just go through and walk out the other side, and I kind of don't want that. The screenshot below demonstrates what I mean.
Player in moving wall
I tried to use rigid body and collisions to help give me a solution, but that didn't stop the problem. I'm now not really sure what the best thing is to do.

Rigidbody should be able to do the trick. You said that it did not work, so here are a few things you need to make sure you have done for the Rigidbody collisions to work properly:
Give the player a Rigidbody component
Give the player a collider (best use capsule collider)
Give the wall a collider (it looks like a box collider would work best)
When you move the player, move them with the function Rigidbody.MovePosition(newPos) or by setting the velocity with Rigidbody.velocity = new Vector3(newVelocity)
The "Is Kinematic" checkbox of the player's Rigidbody component is un-checked (set to false)

Player Keeps Going Through the Wall

I have a game where map/background is made up of prefabs. My player and prefabs both have rigidbodies and colliders. Neither of them have is trigger checked and the prefabs have collision detection set as continuous dynamic. The player's collision detection is set on continuous. Each of the prefabs have a mesh collider and the individual walls of the prefabs have box colliders (none are set to is trigger). I keep trying to test it on my phone using Unity Remote 5, and every time I move the player it goes through the walls. If anyone has any advice on how to prevent my player from going through the walls, I would really appreciate it!
My movement script is:
public class Movement : MonoBehaviour
{
private Touch touch;
private float speedModifier;
void Start()
{
speedModifier = 0.01f;
}
void Update()
{
if(Input.touchCount > 0)
{
touch = Input.GetTouch(0);
if(touch.phase == TouchPhase.Moved)
{ transform.position = new Vector3(transform.position.x + touch.deltaPosition.x * speedModifier,
transform.position.y,
transform.position.z + touch.deltaPosition.y * speedModifier);
}
}
}
}

It would really help to see your movement script however it sounds like you are moving player by manipulating transform.position or using rigidbody.MovePosition() without setting isKinematic to true. The documentation says;
If the rigidbody has isKinematic set to false, it works like transform.position=newPosition and teleports the object to the new position (rather than performing a smooth transition).
This behaviour will ignore the collision. Also you don't need rigidbody on every GameObject in the scene. 1 rigidbody on the player is enough to collide it with other objects.

depend on what I got from your question, when you are playing and the player hit the wall, it goes inside; so the problem might be the mass of the wall. if you must add a Rigidbody to the wall so you need to add more mass to the wall also edit the border of the box collider and make them reasonably a bit wider, otherwise if you dont need a rigidbody on the wall simply keep just the box collider and it will works good. hope this answer help you, and it will be better if you can explain more the situation using some pics.

Using the Rigidbody position or applying force tends to cause the Rigidbody to clip through other colliders. I recommend changing rigidbody.velocity instead of directly changing the position.

Unity: Enemy objects passing through box collider on edges of background

I'm developing a simple 2D Unity game (which I'm very new to so sorry if this is a silly question!) in which my player can eat its enemies by colliding with them. This works fine as I'm just selecting the "is trigger" component for the enemies and using this code in my Player class:
private void OnTriggerEnter2D(Collider2D other)
{
Debug.Log("Hit detected");
Destroy(other.gameObject);
transform.localScale += new Vector3(x, y, z);
}
However, this means the colliders placed around the border of my background image aren't stopping the enemies. What's the best fix for this?

I don't understand very well your question. However it seems that your collisions are not working. So, remember that for have collisions actually taking place in your game you need to use colliders and that one of the two elements participating in the collision need to have the rigidbody component.
That will make the physics work in the engine, which triggers dont.
To check if that works you can debug with:
// called on collision
void OnCollisionEnter2D(Collision2D col)
{
Debug.Log("OnCollisionEnter2D");
}

From what I understood, you want only to detect triggers between the player and the enemies, but you still want these to collide with physic objects in your scene, such as background colliders.
One possible way to achieve this is to create a child object for the player object with a collider component with the trigger option set, and attaching a script to it to handle the triggers. Then, with the use of layers to group your player and enemy objects, you can uncheck the collision between them following: Edit -> Project Settings -> Physics 2D: "Layer Collision Matrix".

You can assign a script to any enemy, checking the distance with the player in each frame. Then you can Uncheck "is trigger"
Vector2.Distance

How do I lock the rotation of a grabbed object with Unity Oculus VR

For an Oculus Quest game i'm working on, I need to be able to grab an object and not rotate it in any way. I should be able to move it in the x, y and z axes though. I'm doing this in a climbing game and the object is quite big. My player is locked on (0,0,0) and you climb by grabbing the terrain and moving it, giving the illusion that you are climbing.
I am using Unity's Oculus integration asset and I have the OVR Grabbable script on the object I want to be able to grab.
How do I make sure that the object I'm grabbing, doesn't rotate at all?
I've tried using a rigidbody and locking the rotation of the wall I want to climb like that, but that doesn't work. Once I grab it, I can still rotate the object.
I have also tried locking the rotation of the hand rigidbody, but that setting seemed to be ignored, because I could still rotate the hands.
I've also tried adding a bit of code in the script, which would reset the objects rotation in the fixed update. I put this code in the OVR Grabbable script.
void FixedUpdate()
{
transform.rotation = Quaternion.identity;
}
Using this code didn't keep the wall from rotating, but it did snap back to rotation (0,0,0) every frame. THis caused the wall to function as if it would still rotate, but it looked like it was switching between (0,0,0) and the rotation it would be at in every frame. This is of course also not the desired result.
I am not using VRTK, because that does not work with the type of climbing I'm trying to achieve.
I would like to be able to grab an object, move it in the x, y and z axes, while it doesn't rotate at all. Currently, I can still rotate the object. How would I fix this issue and completely lock the rotation whenever I grab the object?

If the object has become a child of the hand and you still want it to move but not rotate. You could add a simple script which scores its default rotation and applies it in LateUpdate.
This is designed for non-physics objects so be sure to remove your test where you added the rigidbody to the wall.
Something simple like this would do the job.
Quaternion defaultRotation;
void Awake()
{
defaultRotation = transform.rotation;
}
void LateUpdate()
{
transform.rotation = defaultRotation;
}

Dragger with collider on Unity 3D

I´m making a simple CAD application on Unity 3D using C# to configure closets. I'm trying to limit the movement of the shelves so you can move them only on the hole, so I have a dragger attached to every piece of the closet I want to move, but obviously they can cross with each other.
I thought I could use the collider system that Unity has to limit this movement but since I never worked with Unity before I´m kinda lost. This is my dragger so far:
mousePosition = new Vector3(Input.mousePosition.x, cubo_tmp.transform.position.y, distance);
objPosition = Camera.main.ScreenToWorldPoint(mousePosition);
objPosition.Set(objPosition.x, cubo_tmp.transform.position.y, cubo_tmp.transform.position.z);
I keep y and z components so it can move only in one direction.

Box Colliders are best for cuboid shaped objects.
In the editor, if you click GameObject > 3d Object > Cube, Unity will add a cube with a Box Collider to your scene:
If you want to add a Box Collider to a GameObject that doesn't have one, click Add Component in the Inspector panel and type in "Box Collider" to find it. It looks like this:
Note: If the IsTrigger box is checked, the Collider acts as a Trigger rather than a Collider.
A GameObject with a Collider will "collide" with any other GameObject that also has a Collider, with a small exception involving 2 Mesh Colliders that are both set to Convex.
EDIT: I think you are able to intersect the objects because you are modifying Transform.position directly in your code. This might override the collision behaviour.
Also Go to Edit > Project Settings > Physics and make sure your layer collision matrix allows collisions for the layers on which your objects are placed.