Drag Camera only when raycasting Terrain

Question

Hey! I have a Simple Draggable Camera Script

 using UnityEngine;
 using System.Collections;
 
 public class ViewDrag : MonoBehaviour {
     Vector3 hit_position = Vector3.zero;
     Vector3 current_position = Vector3.zero;
     Vector3 camera_position = Vector3.zero;
     float z = 0.0f;
     
     // Use this for initialization
     void Start () {
         
     }
     
     void Update(){
         if(Input.GetMouseButtonDown(0)){
             hit_position = Input.mousePosition;
             camera_position = transform.position;
             
         }
         if(Input.GetMouseButton(0)){
             current_position = Input.mousePosition;
             LeftMouseDrag();        
         }
     }
     
     void LeftMouseDrag(){
         current_position.z = hit_position.z = camera_position.y;
 
         Vector3 direction = Camera.main.ScreenToWorldPoint(current_position) - Camera.main.ScreenToWorldPoint(hit_position);
         
         // Invert direction to that terrain appears to move with the mouse.
         direction = direction * -1;
         
         Vector3 position = camera_position + direction;
         
         transform.position = position;
     }
 }

and i wanted to ask, how can i change the script in a way, that it is only reacting, when the mouse is hitting the layer "Floor"?

my problem is that i have this draggable camera script and a NGUI scroll panel in my game. so every time i drag the scroll panel, the whole world/camera is also dragging

Answer 1

I believe the function you seek is Physics.Raycast

http://docs.unity3d.com/ScriptReference/Physics.Raycast.html

One of the variables you can use in the RayCast statement is filtering it through layers... http://docs.unity3d.com/Manual/Layers.html

So from a design perspective, I would:

--put my UI on a new layer called "UI"

--put my Terrain on a new layer called "Terrain"

--Determine if mousebuttondown(0) == true

--if it is true, then use the physics.raycast to cast a ray from the camera to the 3dworld space, but also using the filter settings to check for BOTH: UI and Terrain

Now define it a little further..........

--if the out HitInfo.collider.gameObject.layer was the UI layer - then only adjust the scrolling UI

--if the out HitInfo.collider.gameObject.layer was the terrain layer - then use your camera dragging code

Let me know if you have confusion in setting up LayerMask or the Physics.Raycast code....

Drag Camera only when raycasting Terrain

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