How do I change the origin point of a raycast?

Question

 using UnityEngine;
 using System.Collections;
 
 public class Climbing : MonoBehaviour
 {
     void Update()
     {
         var rayRange = 10;
         var rayDirection = transform.TransformDirection(Vector3.forward);
         if(Physics.Raycast(transform.position + transform.up * 0.75, rayDirection, RaycastHit, rayRange))
         {
             Debug.Log("hello world");
         }
     }
 }

Assets/Scripts/Climbing.cs(10,59): error CS0019: Operator *' cannot be applied to operands of type UnityEngine.Vector3' and `double'

please help i have looked up so many tutorials but i just cant move the origin of the raycast.

Answer 1

Best Answer

Answer by robertbu · Jul 08, 2014 at 06:12 PM

In addition to the problem @thomasindustry points out (w$$anonymous$$ch is the source of the error you are asking about), you are using a type where a variable should be when you use RaycastHit for the t$$anonymous$$rd parameter. The parameter needs to be a variable of that type, plus you need the 'out' keyword since the value is returned in the variable. Also when coding in C#, generally I make parameter explicit rather than use 'var'. So here is a rewrite of your code that will compile:

 using UnityEngine;
 using System.Collections;
 
 public class Climbing : MonoBehaviour
 {
     void Update()
     {
         float rayRange = 10.0f;
         Vector3 rayDirection = transform.TransformDirection(Vector3.forward);
         RaycastHit $$anonymous$$t; 
         if(Physics.Raycast(transform.position + transform.up * 0.75f, rayDirection, out $$anonymous$$t, rayRange))
         {
             Debug.Log("hello world");
         }
     }
 }

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Yizzard_Palmero · Jul 09, 2014 at 10:32 PM 0

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well... now its compiling with no errors but even when i walk in front of things the "hello world" isn't triggering... I even tried removing the * .75f, part just in case it was too high but still it wouldn't trigger. There's probably some really easy fix to this but I just started programming.

robertbu · Jul 10, 2014 at 12:52 AM 0

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Start by creating a Debug.DrawRay() for your raycast to check things out:

 Debug.DrawRay(transform.position + transform.up * 0.75f, rayDirection * rayRange);

Yizzard_Palmero · Jul 10, 2014 at 01:00 AM 0

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It just gave me a bunch of compiler errors when I put that in. I added it and I got errors I replaced it with the old code and I got errors and I replaced the if(.....) part with it and got errors. Is that not where I was supposed to put it or what?

robertbu · Jul 10, 2014 at 01:04 AM 0

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I would add it just above the raycast (between lines 10 and 11 in the code I provided). Note that I forgot the 'f' on the end of '0.75f' in my original Debug.DrawRay() comment.

Yizzard_Palmero · Jul 10, 2014 at 01:07 AM 0

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O I'm retarded. I forgot to capitalize the u in Update. It's working now. Thanks so much for your help!

Answer 2

Answer by thomasindustry · Jul 07, 2014 at 05:53 PM

Change your 0.75 to 0.75f, otherwise your code looks right for moving the ray origin 0.75 units above the object.

T$$anonymous$$s will make it a float instead of a double w$$anonymous$$ch unity prefers (quicker calculations but less precise).

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Yizzard_Palmero · Jul 08, 2014 at 06:01 PM 0

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that just brought up a new error that says cannot convert object expression to type float

How do I change the origin point of a raycast?

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