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Question by justking14 · May 10, 2014 at 07:23 PM · 2dmovementmousepositionscreentoworldpoint

ScreenToWorldPoint question

 Vector3 v3Pos = new Vector3(Input.mousePosition.x, 10, Input.mousePosition.y);
 v3Pos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y-30,10));
 a.rigidbody.position = new Vector3(v3Pos.x, v3Pos.y-30, v3Pos.z);

I'm trying to make a game where the camera looks down on a flat plane and the player moves the mouse(thus moving a pen) to draw. I've tried a number of ways to get the pen to follow my mouse, but then have them have worked. With my current code the pen can only be moved through a small area in the center of the screen. I need to be able to move my pen anywhere on the screen without it flying to the very edge of the game world. Any advice? Also, for clarification. I only want the pen to move in the x and z position. I want it to remain locked in its set y position.

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Answer by robertbu · May 11, 2014 at 05:55 AM

Try this:

 using UnityEngine;
 
 public class Bug25b : MonoBehaviour {
 
     void Update() {
         float dist = Camera.main.transform.position.y - transform.position.y;
         Vector3 v3Pos = Input.mousePosition;
         v3Pos.z = dist;
         transform.position = Camera.main.ScreenToWorldPoint (v3Pos);
     }
 }
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