OnSceneGui, How do you convert mouseposition in worldposition?

Questions & Answers
1

I am trying to draw a line from a handle to the mouse, but the returned world position of the conversion matrices is completely off.

Short example:

// btn is reflected upon gameobject
Vector3 mousePosition = Event.current.mousePosition;
mousePosition = SceneView.currentDrawingSceneView.camera.ScreenToWorldPoint(mousePosition);
Handles.DrawLine(btn.transform.position + Vector3.up, mousePosition);

I’ve read many forum posts and threads, all solutions didn’t work.

3

This is what I use for painting objects onto Terrain, its not much different than what Socap said, but it works flawlessly for accurate raycasting.

                        Ray worldRay = HandleUtility.GUIPointToWorldRay(Event.current.mousePosition);
                        RaycastHit hitInfo;
                        if (Physics.Raycast(worldRay, out hitInfo, 10000))
                        {
                            if (hitInfo.collider.gameObject != null)
                            {
                                Handles.DrawLine(btn.transform.position + Vector3.up, Event.current.mousePosition);
                            }
                        }
2

Well it seems I was in the wrong direction, the HandleUtility class provides a raycast helper and you can extract the world position from the ray origin. Simple :slight_smile:

Here is a working solution:

Vector3 mousePosition = Event.current.mousePosition;
Ray ray = HandleUtility.GUIPointToWorldRay(mousePosition);
mousePosition = ray.origin;
Handles.DrawLine(btn.transform.position + Vector3.up, mousePosition);

Cheers

Oh and if the drawing is laggy, you can use HandleUtility.Repaint();