koobas.hobune.stream
Check if RaycastHit variable is different.
Hello, I'm trying to make a script that highlights whatever object I'm looking at using raycasts.It works, except for one problem. When I look from one object to another, both objects stay highlighted instead of one of the objects losing the highlight when I look away. I know exactly why it's happening in the code, but I don't know how to fix it. Code: using UnityEngine; using System.Collections;
public class HighlightScript : MonoBehaviour {
public RaycastHit hit;
public Material mat, mat2;
private bool revert = true;
bool hasChanged = false;
GameObject go;
// Use this for initialization
// Update is called once per frame
void Update () {
Vector3 fwd = transform.TransformDirection (Vector3.forward);
if(Physics.Raycast(transform.position, fwd, out hit, 10)){
go = hit.transform.gameObject;
go.renderer.material = mat;
revert = false;
hasChanged = true;
}
else{
revert = true;
}
if(revert)
{
if (hasChanged){
go.renderer.material = mat2;
}
}
}
}
It might not be the most efficient code, but I just threw it together in a couple of minutes. Basically, I want to check if the object being hit by the raycast has changed. This is what the problem looks like, if it helps: 
Try this I hope this could help:
public class HighlightScript : MonoBehaviour {
public Material mat, mat2;
private Transform lastHittedObject;
void Update()
{
Vector3 fwd = transform.TransformDirection (Vector3.forward);
if(Physics.Raycast(transform.position, fwd, out hit, 10))
{
if(lastHittedObject != null && lastHittedObject != hit.collider.transform)
{
//if the lastHittedObject is not null and different from the current hitted object then
//reset the material of the lastHittedObject
lastHittedObject.renderer.material = mat2;
}
lastHittedObject = hit.collider.transform;
lastHittedObject.renderer.material = mat;//change the hitted object's material
}
else if(lastHittedObject)
{
lastHittedObject.renderer.material = mat2;//reset the material of the last hitted object if the raycast fail
lastHittedObject = null;
}
}
Hope this help :)
Thanks for the help. $$anonymous$$y problem was that I was trying to check if a GameObject variable was null, which is impossible. I didn't think to try a Transform variable.
This is untested, but I might restructure your code like this:
using UnityEngine;
using System.Collections;
public class HighlightScript : MonoBehaviour {
public Material mat;
public Material mat2;
private Transform tr = null;
void Update () {
RaycastHit hit;
if(Physics.Raycast(transform.position, transform.forward, out hit, 10.0f)){
Transform trT = hit.transform;
if (tr != null && tr != trT) {
tr.renderer.material = mat2;
}
tr = trT;
tr.renderer.material = mat;
}
else{
if (tr != null) {
tr.renderer.material = mat2;
tr = null;
}
}
}
}
//TRY THIS (I think It will work):
public class HighlightScript : MonoBehaviour {
public RaycastHit hit;
public Material mat, mat2;
bool changed = false;
GameObject go;
// Use this for initialization
// Update is called once per frame
void Update () {
if(changed == true) {
go.renderer.material = mat2;
changed = false;
}
Vector3 fwd = transform.TransformDirection (Vector3.forward);
if(Physics.Raycast(transform.position, fwd, out hit, 10)){
go = hit.transform.gameObject;
go.renderer.material = mat;
changed = true;
}
}
}
