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Question by blackmethod · Jul 08, 2011 at 06:35 PM · errornullreferenceexceptionreferencenullexception

NullReferenceException Error

When I try to run my script I get this error:

NullReferenceException Movementscript.FixedUpdate () (at Assets/Movementscript.js:7)

Here is my script:

    var speed=20.0;
     function FixedUpdate () {
     
     var torque=Vector3(Input.GetAxisRaw("Vertical"), 0, -Input.GetAxisRaw("Horizontal"));
     if(torque.magnitude > 0.0){
         torque=Camera.main.transform.TransformDirection(torque);
         rigidbody.angularVelocity=Vector3.Lerp(rigidbody.angularVelocity, torque * 2, 0.3);
     }
 
 if (Input.GetButton("W"))
 {
 
 rigidbody.AddRelativeTorque (2, 0, 0);
 
 rigidbody.AddRelativeForce (2, 0, 0);
 }
 
 
 if (Input.GetButton("S"))
 {
 
 rigidbody.AddRelativeTorque (-2, 0, 0);
 rigidbody.AddRelativeForce (-2, 0, 0);
 }
 
 if (Input.GetButton("A"))
 {
 rigidbody.AddRelativeTorque (0, 0, -2);
 rigidbody.AddRelativeForce (0, 0, -2);
 }
 
 
 if (Input.GetButton("D"))
 {
 rigidbody.AddRelativeTorque (0, 0, 2);
 rigidbody.AddRelativeForce (0, 0, 2);
 }
 }


I don't see any problem with the script, so can someone explain to me what's wrong?

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avatar image aldonaletto · Jul 08, 2011 at 07:08 PM 0
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I tested this script and it gave "$$anonymous$$issing Component Exception: There's no 'Rigidbody'... at line: 7". I had no rigidbody, of course, just to test the script. With a rigidbody added, no errors were flagged. Just a shoot in the dark: do you have a main camera?

avatar image blackmethod · Jul 08, 2011 at 07:39 PM 0
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Eh em. One of my helpers clearly came in and deleted the rigidbody... Sorry for uhm. Wasting time.

avatar image blackmethod · Jul 08, 2011 at 07:42 PM 0
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Even after I fixed the rigidbody I get the same error.

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Answer by Sparkplug94 · Jul 08, 2011 at 06:47 PM

Don't you need to tell Unity which rigidbody you're referencing? Rigidbody is a component of a Game Object, I believe.

like, Machine1.rigidbody.AddRelativeTorque

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Answer by Borgo · Jul 08, 2011 at 06:58 PM

Like Sparkplug94 says, to this script works, its need to be attached to an object that have a rigidbody attached.

Anyway, why are you using Input.GetButton to keys(letters)? That letters are mapped in Edit > Project Settings > Input? If no, the best way to use Keys is Input.GetKey.

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Answer by Sparkplug94 · Jul 08, 2011 at 07:03 PM

Borgo is correct. Try this:` var speed=20.0; function FixedUpdate () {

 var torque=Vector3(Input.GetAxisRaw("Vertical"), 0, -Input.GetAxisRaw("Horizontal"));
 if(torque.magnitude > 0.0){
     torque=Camera.main.transform.TransformDirection(torque);
     rigidbody.angularVelocity=Vector3.Lerp(rigidbody.angularVelocity, torque * 2, 0.3);
 }

if (Input.GetKey("w")) {

rigidbody.AddRelativeTorque (2, 0, 0);

rigidbody.AddRelativeForce (2, 0, 0); }

if (Input.GetKey("s")) {

rigidbody.AddRelativeTorque (-2, 0, 0); rigidbody.AddRelativeForce (-2, 0, 0); }

if (Input.GetKey("a")) { rigidbody.AddRelativeTorque (0, 0, -2); rigidbody.AddRelativeForce (0, 0, -2); }

if (Input.GetKey("d")) { rigidbody.AddRelativeTorque (0, 0, 2); rigidbody.AddRelativeForce (0, 0, 2); } }`

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avatar image blackmethod · Jul 08, 2011 at 07:47 PM 0
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Did, and I still end up with the same error.

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Answer by Borgo · Jul 08, 2011 at 07:15 PM

Try to use Camera.mainCamera Instead Camera.main.

I use Camera.mainCamera on my scripts.

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Answer by blackmethod · Jul 08, 2011 at 10:50 PM

This question is still unanswered. Can someone please help me out.

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