Somethings is offset and shift from the original place

Question

This fist map is using in big Mac Com with a bigger size. and second Map is display in normal computer . So why my way point is shifted and didnt display in correct order in normal computer, Below is my script. Some1 please help me check it up Please. THx

//mouseclick to add waypoints

if (Helicopter_Script.flightState == 0) { if (Input.GetMouseButtonDown(0)) { position = Input.mousePosition; if (position != prevMousePosition) { prevMousePosition = position;

             //Debug.Log("MouseClicked: mousePosition (x) - "+position.x + ", (y) - "+position.y);
             if ((position.x>=20 && position.x<=570) && (position.y>=150 && position.y<=780))
             {
                 if (helicopter.GetComponent( "Helicopter_Script" ).wayPoints.length == 0)
                     GameObject.Find("Home").renderer.enabled = true;
                 if (helicopter.GetComponent( "Helicopter_Script" ).wayPoints.length < maxWaypoints)
                 {        

                     points1.push(position);
                     linePoints = new Vector2 [points1.length + 1];
                     points1.ToBuiltin(Vector2).CopyTo(linePoints,0);
                     linePoints[linePoints.length-1] = points1[0];
                     if (line1 != null) Vector.DestroyLine(line1);
                     line1 = new VectorLine("Line1", linePoints , Color.red, null, 2.0, LineType.Continuous);
                     Vector.DrawLine(line1);

                     mapPosition.z = (position.y - 150) * (3300.656 + 1327.897) / (780 - 150) + (-1327.897);
                     mapPosition.x = (position.x - 20) * (824.0381 + 3285.686) / (570 - 20) + (-3285.686);
     
                     object = "p"+(helicopter.GetComponent( "Helicopter_Script" ).wayPoints.length+1);        
                     GameObject.Find(object).transform.localPosition.x = mapPosition.x;
                     GameObject.Find(object).transform.localPosition.z = mapPosition.z; 
                     GameObject.Find(object).renderer.enabled = true;

                     Helicopter_Script.wayPoints.Push(mapPosition);
                     Helicopter_Script.isNewWayPoint = true;
                     Debug.Log("numWaypont - "+Helicopter_Script.wayPoints.length +", mapPosition - "+mapPosition);
                 }
             }
         }
     }
 }
   
 //draw lines to waypoints

// pathPoints[pathIndex] = thisTransform.position; // pathLine.maxDrawIndex = pathIndex-1; // Vector.DrawLine (pathLine); // Vector.SetTextureScale (pathLine, 1.0);

Answer 1

Answer by aldonaletto · Feb 03, 2012 at 03:59 AM

The screens may have different sizes, what could produce the difference. The only way to reliably convert mouse positions to world points (and vice versa) is through the use of some specific Camera functions.
Converting a 3D world point to a 2D screen point is easy:

   screenPoint: Vector2 = Camera.main.WorldToScreenPoint(worldPoint);

But converting screen points to the world is more complicated: the 3D conversion of a 2D point results in a line, not a point, thus you must decide somehow which point of this line to use.
In your case, the easiest way is to cast a ray from the mouse position and find the point where it hits the map plane. To do that, you must create an infinite plane aligned to the map, then use plane.Raycast and ray.GetPoint, like this:

   var ray = Camera.main.ScreenPointToRay(Input.mousePosition); // create the ray
   var mapPlane = new Plane(Vector3.up, Vector3(0, 0, 0)); // create the map plane
   var distance = 0;
   mapPlane.Raycast(ray, distance); // get the distance from the ray start
   worldPoint = ray.GetPoint(distance); // return the map point hit by the ray

This code assumes that the plane is horizontal (normal = Vector3.up) and that 0,0,0 is a point of this plane (the plane created is horizontal and infinite, thus only the y coordinate matters in this case).

Add comment · Show 7 · Share

wenhua · Feb 03, 2012 at 06:05 AM 0

Share

those script are not attached to my camera,its attached to an empty gameOject(HUB). abit dont understand what you means. i also dun quit know how did my previous student display the map on the scene without any camera.. To me i guess is it a fix map or somethings. confuse

wenhua · Feb 03, 2012 at 08:00 AM 0

Share

now i find that its using $$anonymous$$apCam to display the scene. $$anonymous$$apCam is using Orthographic size 800 far 5000 looking toward the terrain. its attached with a Cam Follower. somehow i move the $$anonymous$$apCam's x coordinate, slowly the offset will get to normal but the helicopter icon should be able to move along the line, now the problems is the icons is not moving. think is screen resolution.how sia

aldonaletto · Feb 03, 2012 at 01:17 PM 0

Share

The camera shows the map, and sets the relationship between world and screen coordinates - that's why you must use the camera functions to convert world->screen and screen->world. In your script, this conversion is being made with these equations:

 mapPosition.z = (position.y - 150) * (3300.656 + 1327.897) / (780 - 150) + (-1327.897);
 mapPosition.x = (position.x - 20) * (824.0381 + 3285.686) / (570 - 20) + (-3285.686);

But this only works for a given camera position and screen size - any changes in these setting result in position errors. You should create a function to do the conversion, like this:

function ScreenTo$$anonymous$$ap(position: Vector2): Vector3 {
  var ray = Camera.main.ScreenPointToRay(position); // create the ray
  var mapPlane = new Plane(Vector3.up, Vector3(0, 0, 0)); // create the map plane
  var distance = 0;
  mapPlane.Raycast(ray, distance); // get the distance from the ray start
  return ray.GetPoint(distance); // return the map point hit by the ray
}

Then you could replace the two lines above with the following:

 mapPosition = ScreenTo$$anonymous$$ap(position);

aldonaletto · Feb 03, 2012 at 01:23 PM 0

Share

I don't know this Vector class, but I suppose it uses screen coordinates. If this is true, you must convert the helicopter's world position to screen coordinates to draw it at the right position. You can do it using this:

 screenPoint = Camera.main.WorldToScreenPoint(helicopter.position);

where screenPoint is a Vector2 that will receive the screen coordinates, and helicopter.position is the helicopter's transform.position.

wenhua · Feb 06, 2012 at 08:39 AM 0

Share

indeed its using screen coordinates, but i have no idea how to convert and where to place it T_T as its too complicater. but i will try to understand as much as possible

Show more comments

Somethings is offset and shift from the original place

1 Reply

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions