line render - draw line

Questions & Answers
1

Hi there, I've searched the forum but haven't found a reasonable answer.

I would like to know, how to create and manipulate a LINE.

I would like to have that rendered in realtime in the main camera/game camera.

I would like to edit the endpoints of the line or have access to edit those positions, for example get the positions of 2 objects in 3d space and use them to create the line.

I would like to edit the colors and thicnkess of the line.

So, is that possible?

Thanks in advance,

2

You've basically just described the Line Renderer functionality built into Unity.

Docs for it are here.

3

See also Vectrosity, which is all about drawing lines. Also more info on the forum.

4

I had the same sort of issue (Unity doesn’t really document how to access the variables from a script), but here’s a little script I put together just to illustrate how this works (in javascript):

#pragma strict
var vertexList = new Array();
var lr : LineRenderer;
function Start () {
    vertexList.push(Vector3(0, 0, 0));
    vertexList.push(Vector3(2, 4, 0));
    vertexList.push(Vector3(4, 0, 0));
    lr.SetVertexCount(vertexList.length);
    for(var i=0; i<vertexList.length; i++){
        lr.SetPosition(i, vertexList*);*

}
}
Basically just populates an array of Vector3s and sets them as the Line Renderers’s vertices, then draws them.
Hope this helps.

5

void DrawLine(Vector3 start, Vector3 end, Color color, float duration = 0.2f)
{
GameObject myLine = new GameObject();
myLine.transform.position = start;
myLine.AddComponent();
LineRenderer lr = myLine.GetComponent();
lr.material = new Material(Shader.Find(“Particles/Alpha Blended Premultiply”));
lr.SetColors(color, color);
lr.SetWidth(0.1f, 0.1f);
lr.SetPosition(0, start);
lr.SetPosition(1, end);
GameObject.Destroy(myLine, duration);
}