Ml-agents: RayPerception in Pushblock

[MrGitGo]

I'm going through the examples and I tried to understand the script rayperception. I understood that it is drawing the rays around the agent. But I couldn't figure out what it is doing beyond of this. The addVectorOrbs is awaiting a vector but we are giving a list of vectors. But I don't know which information the vectors in the list contains. Can I just use this code to draw the rays? If yes, is there something missing that I should insert?

```csharp

pragma strict

private var whenNeeded : boolean;

function Update(){

 if(whenNeeded){

     DetectEnemy(transform.position, 20);
 }

}

function DetectEnemy(center: Vector3, radius: float) {

 var hitColliders = Physics.OverlapSphere(center, radius);

 for (var i = 0; i < hitColliders.Length; i++) {
     print(hitColliders[i].tag);
     // collect information on the hits here
 }

}
```

[vincentpierre]

RayPerception.Perceive returns a list of floats, not a list of vectors.
The list of floats goes as follows :

• For each angle a ray is drawn
• For each ray, we add (number of detectable objects + 1) floats.
  
  
  
  • a one hot vector of length number of detectable objects to indicate what type of object is being hit by the ray
  
  
  • a float between 0 and 1 indicating the distance to the colliding object
  
  
  • a float either 0 or 1. 1 if the hit object is unknown, 0 otherwise
  
  

This gives #angles x (#detectableObjects + 2)

I am not sure what your code does but it does not draw rays. this code will (I think) print the tag of all the objects around center under a distance of radius. If you think that is relevant information, you can definitely give that to your agent as long as you can encode it into a vector of floats of fixed length.

[MarcoMeter]

Hi @Semih67
your javascript code excerpt uses a sphere to detect collisions. However, do not use javascript in Unity, because it is deprecated by now.

For what reason do you want to use raycasts? Maybe add a small drawing or a more detailed description of your use-case.

Maybe have a look at this tutorial if you are new to raycasts:
https://www.youtube.com/watch?v=THnivyG0Mvo

[xiaomaogy]

Thank you for the discussion. We are closing this issue due to inactivity. Feel free to reopen it if you’d like to continue to discussion though.

[lock[bot]]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.