Question RigidBody Collision not working ( using Moveposition() )

Hi , i am starting on a small project and i am already having problems , I have a capsule object that i control the horizontal movement off using the Rigidbody function Moveposition() . I have included screenshots of the player Gameobject and the walls i am trying to collide with. The player capsule simply phases throught the wall regardless of the speed at wich i am going.

• this is the inspector view of the Player GameObject

• This is how i am currently handling movement

• And this is the Inspector view of the walls i am trying to collide with

I assume i have missed something mundane so i apologize in advance but I did look for problems like this online and I cannot find what I'm looking for

 

Usually you don't want to have the player's collider be a trigger. Try unselecting "Trigger" on the player Capsule Collider.
You also probably want the player's RigidBody to use gravity.

 

Oh my , that basically solved it ,Thank you! Now the only problem i have left is that, as MelvMay pointed out , it pushes the player the other side if the speed is too high , but for now this will do perfectly and i will probably look into better detection further down the road.
Small follow up though : Is having two colliders so i can have one as trigger a good workaround for this?

 

Yup i can see it now , i thickenned the wall and ,althought if you keep pushing forward , you end up on the other side ; if you stop in the middle , you get shoved out of it ! I will keep the speed at 10 for now , Thanks for the Info !

(EDIT!!): Indeed the problem was using MovePosition for movement altogether , by simply changing the last line of code to this :

        rb.velocity =( moveDir*speed * Time.fixedDeltaTime);

It works great ! (Using the rigidbody component's continuous Detection option on continuous)

 

A couple of notes here:

First, remove Time.fixedDeltaTime from the calculation. Velocity is a time-independent magnitude that is later integrated by the solver. Simply set the value of "speed" to the value in m/s you want your object to move at.

The proof of this is that if the time step is modified (Project Settings > Time > Fixed Timestep), then the velocity of the object in your game will change accordingly. If you remove Time.fixedDeltaTime from the calculation, then the velocity will be the same no matter the time step.

Second, modifying rb.velocity means overriding the results of the physics solver, so it might cause other issues in the future. A more consistent way to set the velocity of the rigidbody is using Rigidbody.AddForce (or any of its variants) with the parameter ForceMode.VelocityChange. Simply applying the difference between the expected velocity and the current velocity will do it. In your code, it would be:

Code (CSharp):

1. rb.AddForce(moveDir * speed - rb.velocity, ForceMode.VelocityChange);

 

Thank you , that bit of code is working wonders !