How to draw a line in the scene view from an EditorWindow ?

Questions & Answers
1

How to draw a line in the Scene View from an EditorWindow?

I was expecting there to be simple way to this, but I can’t seem to find it.

How do I do this?

Gizmos, Handles and Debug.DrawLine all don’t seem to work.

2

short answer:

GLDraw.Line( startPoint , endPoint , duration );

GLDraw.cs can be found here:

`GLDraw.cs` tiny open-source rendering system to draw debug shapes with. Target camera is *not* restricted to `SceneView` and unlike `Gizmos` this will work in !DEBUG builds. · GitHub

original answer:

this is 2020.3 URP example (not tested elsewhere)

GL.Begin( GL.LINES );

using UnityEngine;
using UnityEngine.UIElements;
using UnityEngine.Rendering;
using UnityEditor;
using UnityEditor.UIElements;

public class MyEditorWin : EditorWindow
{
    Vector3Field A, B;
    void OnEnable ()
    {
        RenderPipelineManager.endCameraRendering += EndCameraRendering;

        A = new Vector3Field("Point A"){ value = new Vector3(-100,-100,-100) };
        rootVisualElement.Add(A);
        
        B = new Vector3Field("Point B"){ value = new Vector3(100,100,100) };
        rootVisualElement.Add(B);
    }
    void OnDisable () => RenderPipelineManager.endCameraRendering -= EndCameraRendering;
    void EndCameraRendering ( ScriptableRenderContext context , Camera camera )
    {
        if( camera.name!="SceneCamera" ) return;// Scene view only
        
        Material material = AssetDatabase.GetBuiltinExtraResource<Material>("Sprites-Default.mat");
        material.SetPass(0);

        GL.PushMatrix();
        GL.Begin( GL.LINES );
        {
            GL.Color( new Color32(0,0,255,255) );
            GL.Vertex(A.value);

            GL.Color( new Color32(255,0,0,255) );
            GL.Vertex(B.value);
        }
        GL.End();
        GL.PopMatrix();
    }
    [MenuItem("Tools/"+nameof(MyEditorWin))]
    static void CalculateLightProbes () => GetWindow<MyEditorWin>().titleContent = new GUIContent("(= ФェФ=)");
}