Zoom Camera when it hits a wall (edited)

Question

Hello!

I'd like my camera to zoom in when it hits a wall so that the camera won't go through the wall. How would this be accomplished with RaycastHit?

Something like tag all the walls as 'Wall' and when the RaycastHit.point hits a 'Wall'-tagged object it zooms forward. I have no idea how to code it though.

EDIT:

 using UnityEngine;
  using System.Collections;
  
  public class CarCameraScript : MonoBehaviour
  {
      
          public Transform car;
          public float distance = 6.4f;
          public float height = 1.4f;
          public float rotationDamping = 3.0f;
          public float heightDamping = 10.0f;
          public float zoomRatio = 0.5f;
          public float defaultFOV = 60f;
          private Vector3 rotationVector;
      
          void LateUpdate ()
          {
                  float wantedAngle = rotationVector.y;
                  float wantedHeight = car.position.y + height;
                  float myAngle = transform.eulerAngles.y;
                  float myHeight = transform.position.y;
          
                  myAngle = Mathf.LerpAngle (myAngle, wantedAngle, rotationDamping * Time.deltaTime);
                  myHeight = Mathf.Lerp (myHeight, wantedHeight, heightDamping * Time.deltaTime);
          
                  Quaternion currentRotation = Quaternion.Euler (0, myAngle, 0);
                  transform.position = car.position;
                  transform.position -= currentRotation * Vector3.forward * distance;
                  Vector3 temp = transform.position; //temporary variable so Unity doesn't complain
                  temp.y = myHeight;
                  transform.position = temp;
                  transform.LookAt (car);
  
                  CompensateForWalls (rotationVector, ref temp);
          }
      
          void FixedUpdate ()
          {
                  Vector3 localVelocity = car.InverseTransformDirection (car.rigidbody.velocity);
                  if (localVelocity.z < -0.5f) {
                          Vector3 temp = rotationVector; //because temporary variables seem to be removed after a closing bracket "}" we can use the same variable name multiple times.
                          temp.y = car.eulerAngles.y + 180;
                          rotationVector = temp;
                  } else {
                          Vector3 temp = rotationVector;
                          temp.y = car.eulerAngles.y;
                          rotationVector = temp;
                  }
                  float acc = car.rigidbody.velocity.magnitude;
                  camera.fieldOfView = defaultFOV + acc * zoomRatio * Time.deltaTime;  //he removed * Time.deltaTime but it works better if you leave it like this.
  
                  if (CarTouchControls.reverseOn == true || CarTouchControls.currentSpeed < 0) {
                          rotationDamping = 0f;    
                  } else {
                          rotationDamping = 3.0f;        
                  }
          }
  
          void OnDrawGizmos ()
          {
                  
          }
  
          private void CompensateForWalls (Vector3 fromObject, ref Vector3 toTarget)
          {
  
                  Debug.DrawLine (fromObject, toTarget, Color.green);
  
                  RaycastHit wallHit = new RaycastHit ();
          
                  if (Physics.Linecast (fromObject, toTarget, out wallHit)) {
                          Debug.DrawRay (wallHit.point, Vector3.left, Color.red);
                          toTarget = new Vector3 (wallHit.point.x, toTarget.y, wallHit.point.z);
                  } 
          }
  }

This is not working. Can you tell if I am getting close?

CompensateForWalls() is from a different tutorial than everything else.

Answer 1

Answer by Cherno · Mar 24, 2015 at 01:43 PM

The Standard Assets package has a camera script that handles this kind of situations.

If you want to write it yourself, jsut cast a ray from the object the camera is following towards the camera, and if it hits anything, move teh camera to the hit.point.

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Abacab · Mar 24, 2015 at 03:19 PM 0

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I am really inexperienced with OnDrawGizmos and RaycastHit.

 void OnDrawGizmos() {
         RaycastHit hit;
 
         Gizmos.color = Color.green;
         Gizmos.DrawRay (car, transform.position);
     }

How to include the hit variable and move the camera?

sprawww · Mar 24, 2015 at 03:29 PM 0

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I suggest you read up on a few tutorials. No one here will code the whole thing for you. If you hit a specific roadblock, ask again and I'll gladly help you.

Cherno · Mar 26, 2015 at 11:38 AM 0

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Check the Unity API for Physics.Raycast, there's an example that explains the basics.

ProperDev · Jan 20 at 06:04 PM 0

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I know this is many years late, but I wanted to say thank you. I been raycasting from the camera with no luck, it never occurred to me raycasting from the player. This is so simple, but wanted you to know, thank you.

Zoom Camera when it hits a wall (edited)

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