Gizmos.DrawLine - thickens?

Question

Hey, i am somehow having problems to see a Gizmos.DrawLine in my editor (for debugging) is there a way to let the line appear thicker?, so at the moment its just this:

 Gizmos.color = new Color (0,1F,0,1F);
 
         if (lastCompletedVectorPath != null) {
             for (int i=0;i<lastCompletedVectorPath.Count-1;i++) {
                 Gizmos.DrawLine (lastCompletedVectorPath[i],lastCompletedVectorPath[i+1]);
             }
         }

Answer 1

Unfortunately Unity doesn't allow to change the line width. So lines drawn are always one pixel lines.

You can either:

Draw multiple lines in parallel slightly offset.
Draw actual quads instead of lines. However this has to be done with the GL class manually.

For simple debugging it's easier to draw multiple lines. You can create a helper method like this:

 public static void DrawLine(Vector3 p1, Vector3 p2, float width)
 {
     int count = Mathf.CeilToInt(width); // how many lines are needed.
     if(count ==1)
         Gizmos.DrawLine(p1,p2);
     else
     {
         Camera c = Camera.current;
         if (c == null)
         {
             Debug.LogError("Camera.current is null")
             return;
         }
         Vector3 v1 = (p2 - p1).normalized; // line direction
         Vector3 v2 = (c.position - p1).normalized; // direction to camera
         Vector3 n = Vector3.Cross(v1,v2); // normal vector
         for(int i = 0; i < count; i++)
         {
             Vector3 o = n* width ((float)i/(count-1) - 0.5f);
             Gizmos.DrawLine(p1+o,p2+o);
         }
     }
 }

I haven't tested this method as i don't have a Unity installation at hand, but it should work.

Answer 2

Answer by thepigeonfighter · Sep 21, 2019 at 08:11 PM

Really old question here. In case anyone else needs to do something similar here is an easy way to do it.

 var p1 = startPosition;
 var p2 = endPosition;
 var thickness = 3;
 Handles.DrawBezier(p1,p2,p1,p2, Color.red,null,thickness);

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Parzival · May 27, 2020 at 02:55 PM 0

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This is awesome. Thank you!

Answer 3

Answer by jozhard · Mar 22, 2019 at 11:32 AM

Bunny83's version didn't work directly, but the idea is good, so I've changed it a bit to work in screen coordinates and now it works better:

 public static void DrawLine(Vector3 p1, Vector3 p2, float width)
 {
     int count = 1 + Mathf.CeilToInt(width); // how many lines are needed.
     if (count == 1)
     {
         Gizmos.DrawLine(p1, p2);
     }
     else
     {
         Camera c = Camera.current;
         if (c == null)
         {
             Debug.LogError("Camera.current is null");
             return;
         }
         var scp1 = c.WorldToScreenPoint(p1);
         var scp2 = c.WorldToScreenPoint(p2);
 
         Vector3 v1 = (scp2 - scp1).normalized; // line direction
         Vector3 n = Vector3.Cross(v1, Vector3.forward); // normal vector
 
         for (int i = 0; i < count; i++)
         {
             Vector3 o = 0.99f * n * width * ((float)i / (count - 1) - 0.5f);
             Vector3 origin = c.ScreenToWorldPoint(scp1 + o);
             Vector3 destiny = c.ScreenToWorldPoint(scp2 + o);
             Gizmos.DrawLine(origin, destiny);
         }
     }
 }

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Alex_TNT · Feb 19, 2020 at 09:24 AM 0

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Thanks, works perfect.

Answer 4

Here is an easy way to draw thick lines in the scene view and on standard cameras in the game view. (Note that I think the 'thickness' is expressed in pixels).

     public static void DrawThickLine(Vector3 start, Vector3 end, float thickness)
     {
         Camera c = Camera.current;
         if (c == null) return;
 
         // Only draw on normal cameras
         if (c.clearFlags == CameraClearFlags.Depth || c.clearFlags == CameraClearFlags.Nothing)
         {
             return;
         }
 
         // Only draw the line when it is the closest thing to the camera
         // (Remove the Z-test code and other objects will not occlude the line.)
         var prevZTest = Handles.zTest;
         Handles.zTest = UnityEngine.Rendering.CompareFunction.LessEqual;
 
         Handles.color = Gizmos.color;
         Handles.DrawAAPolyLine(thickness * 10, new Vector3[] { start, end });
 
         Handles.zTest = prevZTest;
     }

Answer 5

Answer by atorstling · Aug 01, 2021 at 11:47 AM

For those who are trying to adjust circle thickness, here's how. This example is using normals applicable to the 2D case:

 Handles.color = Color.green;
 Handles.DrawWireArc(transform.position, transform.forward, transform.right, 360, 0.2f, 2.0f);

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Gizmos.DrawLine - thickens?

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