koobas.hobune.stream
Drag 3d objects on a 3d scenario?
Im using a RTS style camera (55°), and I manage to do a click on a UI button to instantiate a prefab at my mouse position with this code.
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
isInstantianting = false;
if (Physics.Raycast(ray, out hit))
{
Instantiate(initiateGO, hit.point, Quaternion.identity);
}
And then I wanted to drag the prefab with my mouse, so I found this code here.
using UnityEngine;
public class DragTest2:MonoBehaviour
{
private Vector3 screenPoint;
private Vector3 offset;
void OnMouseDown()
{
screenPoint = Camera.main.WorldToScreenPoint(gameObject.transform.position);
offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
}
void OnMouseDrag()
{
Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
transform.position = curPosition;
}
}
But what I really need is that the prefab follow my mouse without me having to hold a mouse button. Like ... I click the UI button to instantiate a prefab and then the prefab will be at the mouse position untill I click at the scenario to drop the prefab there, and I want the prefab to be always on top of the plane without going thru or high up to the sky whilst im dragging it.
Thx already!
Best Answer
Hi
try this one:
using UnityEngine;
using System.Collections;
public class UIInstantiate : MonoBehaviour
{
public GameObject machineGun;
GameObject instantiatedMachineGun;
bool instanteateStep1;
bool instanteateStep2;
bool instanteateStep3;
Vector3 wantedPos;
void Start ()
{
instanteateStep1 = true;
instanteateStep2 = false;
instanteateStep3 = false;
}
void Update()
{
Step1 ();
Step2 ();
Step3 ();
}
void Step1()
{
//I used a key. You only need to adapt it to your UIbutton
if(Input.GetKeyDown(KeyCode.A) && instanteateStep1 == true)
{
RaycastHit hit1;
Ray ray1 = Camera.main.ScreenPointToRay(Input.mousePosition);
if(Physics.Raycast (ray1, out hit1, 100) )
{
instantiatedMachineGun = (GameObject)Instantiate (machineGun, hit1.point, Quaternion.identity);
instanteateStep1 = false;
instanteateStep2 = true;
}
}
}
void Step2()
{
RaycastHit hit2;
Ray ray2 = Camera.main.ScreenPointToRay(Input.mousePosition);
if (instanteateStep2 == true)
{
if(Physics.Raycast (ray2, out hit2, 100))
{
if(hit2.collider.gameObject == instantiatedMachineGun)
{
if(Input.GetButton ("Fire1"))
{
instanteateStep2 = false;
instanteateStep3 = true;
}
}
else
{
wantedPos = new Vector3 (hit2.point.x, hit2.point.y, hit2.point.z);
instantiatedMachineGun.transform.position = wantedPos;
if(Input.GetButton ("Fire1"))
{
instanteateStep2 = false;
instanteateStep3 = true;
}
}
}
}
}
void Step3()
{
if (instanteateStep3 == true)
{
instanteateStep1 = true;
instanteateStep3 = false;
instantiatedMachineGun.transform.position = wantedPos;
}
}
}
I made and tested this script assigning it to an empty gameobject (like a gameController).
I'm sorry if this dont work for you.
