enabling trail renderer

Question

I am putting skidmarks in my game with a trail renderer that activates when the tire slips. I have this so far:

// Define the variables used in the script, the Corresponding collider is the wheel collider at the position of // the visible wheel, the slip prefab is the prefab instantiated when the wheels slide, the rotation value is the // value used to rotate the wheel around it's axel. var CorrespondingCollider : WheelCollider; var SlipPrefab : GameObject; private var RotationValue : float = 0.0;

function Update () {

 // define a hit point for the raycast collision
 var hit : RaycastHit;
 // Find the collider's center point, you need to do this because the center of the collider might not actually be
 // the real position if the transform's off.
 var ColliderCenterPoint : Vector3 = CorrespondingCollider.transform.TransformPoint( CorrespondingCollider.center );

 // now cast a ray out from the wheel collider's center the distance of the suspension, if it hit something, then use the "hit"
 // variable's data to find where the wheel hit, if it didn't, then se tthe wheel to be fully extended along the suspension.
 if ( Physics.Raycast( ColliderCenterPoint, -CorrespondingCollider.transform.up, hit, CorrespondingCollider.suspensionDistance + CorrespondingCollider.radius ) ) {
     transform.position = hit.point + (CorrespondingCollider.transform.up * CorrespondingCollider.radius);
 }else{
     transform.position = ColliderCenterPoint - (CorrespondingCollider.transform.up * CorrespondingCollider.suspensionDistance);
 }

 // now set the wheel rotation to the rotation of the collider combined with a new rotation value. This new value
 // is the rotation around the axle, and the rotation from steering input.
 transform.rotation = CorrespondingCollider.transform.rotation * Quaternion.Euler( RotationValue, CorrespondingCollider.steerAngle, 0 );
 // increase the rotation value by the rotation speed (in degrees per second)
 RotationValue += CorrespondingCollider.rpm * ( 360/60 ) * Time.deltaTime;

 // define a wheelhit object, this stores all of the data from the wheel collider and will allow us to determine
 // the slip of the tire.
 var CorrespondingGroundHit : WheelHit;
 CorrespondingCollider.GetGroundHit( CorrespondingGroundHit );

 // if the slip of the tire is greater than 2.0, and the slip prefab exists, create an instance of it on the ground at
 // a zero rotation.
 if ( Mathf.Abs( CorrespondingGroundHit.sidewaysSlip ) &gt; 2.0 ) {
     if ( SlipPrefab ) {
         Instantiate( SlipPrefab, CorrespondingGroundHit.point, Quaternion.identity );
     }
 }
 if ( Mathf.Abs( CorrespondingGroundHit.sidewaysSlip ) &gt; 2.0 ) {
         TrailRenderer.enabled = true; //THIS IS THE PROBLEM
     }
 }

What i have here is working, apart from the last section with TrailRenderer. I get an error of

BCE0020: An instance type of 'UnityEngine.Renderer' is required to access non static member 'enabled'.

how do i fix this?

Answer 1

Answer by fherbst · Jul 11, 2010 at 02:11 PM

Use GetComponent(TrailRenderer).enabled = true instead.

TrailRenderer (uppercase) is the class name, but you want the particular instance on your gameObject. Many classes (like Rigidbody) have direct access names (GameObject.rigidbody), but TrailRenderer hasn't, so you have to use GetComponent to access it.

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HolBol · Jul 11, 2010 at 02:18 PM 0

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Thanks that works, but how would i get it so the trails stay there even when it's not active, or is that not possible?

enabling trail renderer

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