Destroying a LineRenderer component and then adding it again at runtime

Question

I have a global var lineRenderer:LineRenderer that is:

initiated in Start() via lineRenderer = gameObject.AddComponent(LineRenderer);
has its setPosition() populated with a bunch of coordinates - so it appears like a "drawn line" on a whiteboard

And then I want to erase the board - presumably, the way to do that is Destroy() ... so I tried Destroy(lineRenderer);

When I attempt to reinitiate it with lineRenderer = gameObject.AddComponent(LineRenderer);, I get errors like: "Can't add component 'Line Renderer' to lRenderer (name of game object) because such a component is already added to the game object!"

Subsequent lineRenderer.property assign's yield errors like: "Object reference not set to an instance of an object"

So, long description short, how do you ERASE the line from a lineRenderer, so that you can repopulate its setPosition? (Not sure if destroy is the right word..)

Answer 1

Answer by Loius · Dec 26, 2010 at 03:03 PM

By reading the documentation, it looks like you want

GetComponent(LineRenderer).SetVertexCount(0)

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ina · Dec 26, 2010 at 03:40 PM 0

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No. Error still occurs. I had that in there before, referenced as lineRenderer.SetVertexCount(0) -- to be sure, I tried GetComponent(LineRenderer).SetVertexCount(0); - same error still occurs

Answer 2

Answer by Nomad the Grey · Mar 01, 2011 at 06:22 PM

Although I realize that I am replying to this post a couple of months later than necessary, perhaps I can help somebody anyway. This error exists in ordinary .NET apps. When I see this error, I fix the problem by inserting code similar to:

lineRender = new LineRenderer();

Hope this helps.

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Answer 3

Answer by RyanZimmerman87 · Mar 09, 2013 at 02:22 AM

 public LineRenderer lineRenderer;
 
 Start()
 {
 lineRenderer = gameObject.GetComponent<LineRenderer>();
 }
 
 Update()
 {
 if (your desired conditions)
 {
 lineRenderer.SetVertexCount(0);
 }

That seems to be working for me, hope this helps.

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Answer 4

Answer by liamrasoull · Apr 28 at 06:49 PM

you can use lineRenderer.positionCount = 0;

lineRenderer.SetVertexCount(0); is outdated.

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Destroying a LineRenderer component and then adding it again at runtime

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