Touch to move

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Hi. I'm trying to conduct a little project for android but I've reached an issue. I'm trying to have my character move along a terrain so I made it to where if you click somewhere, a marker appears at the location and your character automatically follows it, as t$$anonymous$$s script does:

 function Update () {
      for (var i = 0; i < Input.touchCount; i++) {
          if (Input.GetTouch(i).phase == TouchPhase.Moved) {
              var touchPos : Vector3 = Input.GetTouch(i).position;
              touchPos.z = 4.0;
              touchPos.y *= 4.0;
              var createPos = myCam.ScreenToWorldPoint(touchPos);
              projectile.position = createPos;
          }
      }

I also set up 2 cameras; one that follows the player and another that is at a top-down angle facing the terrain and character (w$$anonymous$$ch is the one that is referenced to in the script), both of w$$anonymous$$ch are orthograp$$anonymous$$c. My problem is that I can't seem to get the touch marker to move/conform along the terrain, or if there's a $$anonymous$$gh area the marker would just go through it, as it doesn't change its Y value if part of the terrain is raised. How would I go about accurately pinpointing the touch location in relation to the 3d environment? I've tried placing the marker $$anonymous$$gh up and raycasting downwards but the touch part wouldn't respond at all, or very poorly.

Answer 1

Best Answer

Answer by redeemer · May 18, 2015 at 05:38 AM

I'd suggest to use raycast to detect the exact point where the tpuch and the terrain collides.

Somet$$anonymous$$ng like should work :

 Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
                 
 RaycastHit[] $$anonymous$$ts = Physics.RaycastAll(ray, 200);

 foreach(RaycastHit $$anonymous$$t in $$anonymous$$ts) {
                 
     if($$anonymous$$t.collider.CompareTag("Terrain")) Debug.Log($$anonymous$$t.point);
 
 }

Instead the mouse position, use your touch position.

Of course you could set the raycast to only detect the layers you want, t$$anonymous$$s will detect the terrain point even if you touch over other object as long as the terrain is in the ray.

Hope t$$anonymous$$s helps

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phatality123 · May 18, 2015 at 10:53 PM 0

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I'm kind of confused; for this approach, should I keep my 2-cam setup or would this work for my main camera?

redeemer · May 19, 2015 at 03:09 AM 0

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That code uses the main camera Camera.main.ScreenPointToRay(Input.mousePosition), but you can use the camera you want.

For example :

 Camera topCam = GameObject.FindGameObjectWithTag("TopCam");
 
  Ray ray = topCam.ScreenPointToRay(Input.mousePosition);
                  
  RaycastHit[] hits = Physics.RaycastAll(ray, 200);
  
  foreach(RaycastHit hit in hits) {
                  
      if(hit.collider.CompareTag("Terrain")) Debug.Log(hit.point);
  
  }

Take a look at this http://docs.unity3d.com/ScriptReference/Camera.ScreenPointToRay.html

In your case, I guess your following camera is the main cam, so if you want to click in that cam use the first code, if you want to click in the "mini-map" or "top-down" cam, use the second one.

Of course, you terrain must have a collider since you're not using the Unity Terrain in order to being detetcted by the raycast.

phatality123 · May 19, 2015 at 08:03 PM 0

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Did I get this right (using your prior suggestion) because after rewriting it in javascript I get no errors though nothing is printed. I made sure my objects are tagged as well.. var rays : Ray; rays = mainCamera.ScreenPointToRay(Input.mousePosition); var hits : RaycastHit[];
hits = Physics.RaycastAll(rays, 200);

  for(var hit : RaycastHit in hits) {
                  
      if(hit.collider.CompareTag("Terrain")) 
      {
           print(hit.point);
      }

Testing it with mouse first just to see if it works.

redeemer · May 19, 2015 at 10:46 PM 0

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I've made you two examples, one with a cube used as the terrain and another with a Unity Terrain. Hope this help you solve any doubts. I leave you the link to the unitypackage

https://mega.co.nz/#!i1NlFJgJ!fToUf5WbZuwTiZd03NU0eXx_6pYmqVKc5FHvlF0Qcss

phatality123 · May 20, 2015 at 01:14 AM 0

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Thanks :). You've been really helpful.

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Answer 2

Answer by hanger · May 18, 2015 at 06:14 AM

I've never used it, but what you want to do is query the terrain height at a particular world position. If you're using the Unity terrain system, there's a call for that.

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phatality123 · May 18, 2015 at 07:49 PM 0

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Sorry, maybe I should've specified that my terrain was made manually in blender.

Answer 3

Answer by abhi_360 · May 18, 2015 at 06:09 AM

Your touchPos has no height component i.e the Input.GetTouch(i).position provides the ScreenSpace positions w$$anonymous$$ch is (pixelWidth,pixelHeight) like a vector2 so when your changing screen to world point that function has no height to it w$$anonymous$$ch then sets to zero you can Debug.Log(createPos).

You can use Physics RayCasts for t$$anonymous$$s job. But if you have Unity 5 then you can download there standard assets w$$anonymous$$ch already has the kind of controller (like strategy games Civilization, Dota).

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phatality123 · May 18, 2015 at 07:41 PM 0

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So in what way should I try setting up the raycasts, because I've used them but am experiencing issues with my current setup.

abhi_360 · May 19, 2015 at 05:07 AM 0

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if you can be more specific about your raycast problems then i can give a solution. Like what issues are you experiencing

phatality123 · May 19, 2015 at 08:22 PM 0

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Going into areas with accessible overhangs where the ray is interrupted, having the ray-casting follow touch/click location somewhat accurately, if at all. My current setup has a gameobject, high up, following the touch position in relation to the top-down camera (not the main one following player) raycasting downwards and at the hitpoint is a separate gameobject (a marker).

abhi_360 · May 20, 2015 at 09:29 AM 0

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good you found your solution

Touch to move

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