Develop Reference

Teleport while Controlling GameObject in Unity3D

I am a freshman design student and they've asked us to create a game on unity3D without much training on it so needless to say I don't know much except for the super basic stuff. I don't know anything about c# and I've been having an issue making a gameobject teleport. I've spent 6 hours searching for a solution online and the only conclusion I got to was that my object is probably having issues teleporting because of the way I am controlling it - something to do with the controller remembering the last position before the teleport and returning to it. I have no idea how to fix it though.
So this is what my scene looks like: I have a sphere as my character, I move it to this other object that has a collider as trigger which then teleports my sphere to a different point (black object) on the terrain. As soon as my object reaches there, it starts sliding back to the point where the teleport happened. I even tried edit > project settings > physics > auto sync transforms as many suggested that and it worked for them.
This is the code by which I control my player:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class MyPlayer : MonoBehaviour
{
public float speed = 1;
public float spacing = 1;
private Vector3 pos;
// Use this for initialization
void Awake()
{
pos = transform.position;
}
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.W))
pos.x += spacing;
if (Input.GetKeyDown(KeyCode.S))
pos.x -= spacing;
if (Input.GetKeyDown(KeyCode.D))
pos.z -= spacing;
if (Input.GetKeyDown(KeyCode.A))
pos.z += spacing;
transform.position = Vector3.MoveTowards(transform.position, pos, speed * Time.deltaTime);
}
}
and I also have a camera that follows the sphere using this code
using UnityEngine;
using System.Collections;
public class CompleteCameraController : MonoBehaviour {
public GameObject player; //Public variable to store a reference to the player game object
private Vector3 offset; //Private variable to store the offset distance between the player and camera
// Use this for initialization
void Start ()
{
//Calculate and store the offset value by getting the distance between the player's position and camera's position.
offset = transform.position - player.transform.position;
}
// LateUpdate is called after Update each frame
void LateUpdate ()
{
// Set the position of the camera's transform to be the same as the player's, but offset by the calculated offset distance.
transform.position = player.transform.position + offset;
}
}
and I have another code on the camera that makes me be able to look around using my mouse
using UnityEngine;
using System.Collections;
public class FlyCamera : MonoBehaviour
{
/*
Writen by Windexglow 11-13-10. Use it, edit it, steal it I don't care.
Converted to C# 27-02-13 - no credit wanted.
Simple flycam I made, since I couldn't find any others made public.
Made simple to use (drag and drop, done) for regular keyboard layout
wasd : basic movement
shift : Makes camera accelerate
space : Moves camera on X and Z axis only. So camera doesn't gain any height*/
float mainSpeed = 700.0f; //regular speed
float shiftAdd = 950.0f; //multiplied by how long shift is held. Basically running
float maxShift = 2000.0f; //Maximum speed when holdin gshift
float camSens = 0.25f; //How sensitive it with mouse
private Vector3 lastMouse = new Vector3(255, 255, 255); //kind of in the middle of the screen, rather than at the top (play)
private float totalRun = 1.0f;
void Update()
{
lastMouse = Input.mousePosition - lastMouse;
lastMouse = new Vector3(-lastMouse.y * camSens, lastMouse.x * camSens, 0);
lastMouse = new Vector3(transform.eulerAngles.x + lastMouse.x, transform.eulerAngles.y + lastMouse.y, 0);
transform.eulerAngles = lastMouse;
lastMouse = Input.mousePosition;
//Mouse camera angle done.
//Keyboard commands
float f = 0.0f;
Vector3 p = GetBaseInput();
if (Input.GetKey(KeyCode.LeftShift))
{
totalRun += Time.deltaTime;
p = p * totalRun * shiftAdd;
p.x = Mathf.Clamp(p.x, -maxShift, maxShift);
p.y = Mathf.Clamp(p.y, -maxShift, maxShift);
p.z = Mathf.Clamp(p.z, -maxShift, maxShift);
}
else
{
totalRun = Mathf.Clamp(totalRun * 0.5f, 1f, 1000f);
p = p * mainSpeed;
}
p = p * Time.deltaTime;
Vector3 newPosition = transform.position;
if (Input.GetKey(KeyCode.Space))
{ //If player wants to move on X and Z axis only
transform.Translate(p);
newPosition.x = transform.position.x;
newPosition.z = transform.position.z;
transform.position = newPosition;
}
else
{
transform.Translate(p);
}
}
private Vector3 GetBaseInput()
{ //returns the basic values, if it's 0 than it's not active.
Vector3 p_Velocity = new Vector3();
if (Input.GetKey(KeyCode.W))
{
p_Velocity += new Vector3(0, 0, 1);
}
if (Input.GetKey(KeyCode.S))
{
p_Velocity += new Vector3(0, 0, -1);
}
if (Input.GetKey(KeyCode.A))
{
p_Velocity += new Vector3(-1, 0, 0);
}
if (Input.GetKey(KeyCode.D))
{
p_Velocity += new Vector3(1, 0, 0);
}
return p_Velocity;
}
}
Please let me know if there's a specific part of my code that I need to edit to resolve this or alternatively if you have a different code that won't give me this issue, that would make my life so much easier. If I need to edit something or you're sharing a code, please respond with the complete (corrected) code because otherwise I will just be even more confused.
I know this is a super long post and I am sorry but I am really desperate. It's been really hard studying online and basically having to teach myself all of this. This is for a final project so I will really appreciate any help you can throw my way. Thank you for reading and thanks for any help in advance.
EDIT: The teleport code is executing fine because I do teleport to the chosen location, I just end up sliding back to the point which I teleported from.
This is the teleporting code I am using.
using UnityEngine;
using System.Collections;
public class Teleport : MonoBehaviour
{
public GameObject ui;
public GameObject objToTP;
public Transform tpLoc;
void Start()
{
ui.SetActive(false);
}
void OnTriggerStay(Collider other)
{
ui.SetActive(true);
if ((other.gameObject.tag == "Player") && Input.GetKeyDown(KeyCode.E))
{
objToTP.transform.position = tpLoc.transform.position;
}
}
void OnTriggerExit()
{
ui.SetActive(false);
}
}

Ok, so the main reason why your character is drifting back to original position is that the pos variable in the MyPlayer script stays the same after teleporting.
Remedy for that will be changing pos variable from Teleport script after objToTP.transform.position = tpLoc.transform.position;. Something like objToTP.gameobject.GetComponent<MyPlayer>().pos = tpLoc.transform.position;
But make sure that objToTP has component MyPlayer and pos in MyPlayer is public.
Once again: it's a simple way to resolve your problem. In a real project you should create more flexible architecture, but that's a different story.

I believe that you sliding back because you moving player with transform.position = Vector3.MoveTowards in Update().
And you moving it to coordinates that was got from your input

How do i make it into a smooth camera? (unity C# programming)

This is what i got and why does this website want me to put more explaining when i clarified above well i want to achieve a smooth camera control where the player is in the middle of the camera if the mouse is in the middle but as it moves toward a direction i want the camera to move just a little bit to reveal terrain (here i have 2 problems:
1.The camera doesnt move if the mouse is at the point 0,0 of the screen and i want it to be the center of the camera
2. the camera drifts away in that direction, it doesnt stop like i want to make it):
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CameraController : MonoBehaviour {
// Camera cam = Camera.main.orthographicSize;
//Vector2 camcenter = new Vector2(cam * 2, camheight);
public GameObject mage;
private Vector3 offset;
public float mincam = 30f;
public float maxcam = 120f;
public bool mouse_smooth_cam = false;
// Update is called once per frame
void LateUpdate ()
{
offset = Input.mousePosition / 100 + transform.position - mage.transform.position;
transform.position = mage.transform.position + offset;
}
void Update()
{
HandleZoom();
}
private void HandleZoom()
{
float scrollValue = Input.mouseScrollDelta.y;
float newCamSize = Camera.main.orthographicSize - scrollValue*4;
Camera.main.orthographicSize = Mathf.Clamp(newCamSize, mincam, maxcam);
}
}

Instead of Input.mousePosition / 100 use Camera.main.ScreenToWorldPoint(Input.mousePosition)
also always use Time.deltaTime in Update methods
var PAN_SPEED = 30f;
var mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
offset = mousePos + transform.position - mage.transform.position;
transform.position = mage.transform.position + offset * Time.deltaTime * PAN_SPEED;

How to instantiate objects for the length of an audio clip

My overall goal is to have a script that constantly generates an object along the y axis until a piece of audio stops playing. The object in question are "starfields" which are groups of stars to create the effect of outer-space. This can be done easily and I already know how to do this using a constant velocity. The hardest part for me is to generate these objects with an object that gets faster and faster.
To elaborate on this, there is a rocket that goes faster and faster using the scripts below, it multiplies a constant speed which I set (10) with the movement from a Vector3. It has an acceleration of 0.25 as you can see in the code. The idea is that the rocket keeps on flying until the audio ends and the stars stop spawning and the game ends. The rocket gradually gets faster and faster so I can't just hard-code it in.
Below is my code for the rocket and the star spawn script.
This is just one way around the problem, I have spent quite a while trying different things but nothing seems to work. I have a feeling there's an easier way around this problem.
Star spawn code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class StarSpawn : MonoBehaviour {
// Use this for initialization
public Transform Object;
AudioSource Music;
float MusicClipLength;
float distance;
void Start()
{
Music = GetComponent<AudioSource>();
AudioClip MusicClip;
MusicClip = Music.clip;
MusicClipLength = Music.clip.length; //time
distance = ((((0.5f * 0.25f) * (MusicClipLength * MusicClipLength)))); //distance
float RoundedDistance = (float)Mathf.Floor(distance); //rounding
for (int i = 0; i <= RoundedDistance; i++) //generation loop
{
Instantiate(Object, new Vector3(0, i * 1750.0f, 500),
Quaternion.Euler(-90, 0, 90));
}
}
}
Rocket code (some of this is irrelevant)
using UnityEngine;
using System.Collections;
using UnityStandardAssets.CrossPlatformInput;
public class PlayerController : MonoBehaviour
{
public bool Launch = false;
private Rigidbody rb;
public int Speed;
void Start()
{
rb = GetComponent<Rigidbody>();
}
public void LaunchStart()
{
Launch = true;
}
void FixedUpdate()
{
float altitude = (rb.position.y);
if (Launch == true)
{
float moveHorizontal = CrossPlatformInputManager.GetAxis("Horizontal");
Vector3 movement = new Vector3(moveHorizontal, 0.25f, 0.0f);
if (altitude > 0)
{
rb.AddForce(movement * Speed);
}
}
}
}
0.25 is the acceleration for everything and 10 is the set public speed for instance.
I realise this is quite a big problem is solve so even if someone recognises an easier way around the problem I would much appreciate any advice.
Edit
My actual problem is that the stars over spawn, way too much. So when the audio has finished, there are still lots of stars left.

Using coroutines would probably be a good choice here. With that, you could then use the speed of the rocket to determine the time delay between spawning stars:
float totaltime;
void Start()
{
Music = GetComponent<AudioSource>();
AudioClip MusicClip;
MusicClip = Music.clip;
MusicClipLength = Music.clip.length; //time
distance = ((((0.5f * 0.25f) * (MusicClipLength * MusicClipLength)))); //distance
float RoundedDistance = (float)Mathf.Floor(distance); //rounding
StartCoroutine(Spawner());
}
void IEnumerator Spawner()
{
totaltime += Time.deltaTime;
while (totaltime < MusicClipLength)
{
Instantiate(Object, new Vector3(0, i * 1750.0f, 500), Quaternion.Euler(-90, 0, 90));
yield return new WaitForSeconds(rocketspeedFactor); // you should mess around with this value to get the spawning frequency correct.
// would be good to retrieve the speed from the rocket and multiple by some factor
}
}

Controlling both angles of a Ray

I'm new to Unity and have a problem I can't figure out. I want objects to spawn randomly at a distance of 20 from a FPS player. You could say the objects need to spawn on the surface of a half sphere with the player as the center. But: not all of that sphere can be used. The "highest" part is too high for objects to spawn, so basically it's a sphere with the top cut off.
What I tried:
thePosition = Random.onUnitSphere * 20 + object2.transform.position;
Obviously, this takes into account the whole sphere (should be only half a sphere) and doesn't take into account the "cut off" part.
So I thought: I basically want to make a ray that can pivot on the ground (so the max angle is 360°), and can go up and down, with a max angle of 90°. Think of it like a canon that can turn (pivot) and go up/down with an angle. Here's an image of what I mean:
So I tried:
Vector3 raydirection = new Vector3 (1f, 1f, 0);
raydirection = Quaternion.Euler (45, 0, 0) * raydirection;
Ray ray = new Ray (player.transform.position, raydirection);
thePosition = ray.GetPoint (20);
But that doesn't allow me to control the pivot angle (angle 1) and the "up-down" angle (angle 2) separately.
So my question is: how can I make it so that I can control both angles of this ray? Because if I can do that, I can just take a random number between 0 and 360 for the pivoting part, and between 0 and 90 for the up/down part.
Any help is much appreciated!

Coincidentally, I needed something very similar to this. The following Behavior will spawn a certain prefab (objectToSpawn) exactly spawnCount times within the set parameters.
The helper class (bottom code) generates a Vector from Yaw, Pitch and a Vector (basically the distance in your case).
What it does:
Pick a random direction (yaw and pitch) within set parameters
Pick a random distance (sounds like you can omit this step)
Calculate the vector
Spawn object
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class RandomSpawner : MonoBehaviour {
public GameObject objectToSpawn;
public int spawnCount;
public float minDistance = 2;
public float maxDistance = 10;
public float minPitchDegrees = 0;
public float maxPitchDegrees = 45;
public float minYawDegrees = -180;
public float maxYawDegrees = 180;
void Start ()
{
for (int i = 0; i < spawnCount; i++)
{
float distance = minDistance + Random.value * (maxDistance - minDistance);
float yaw = minYawDegrees + Random.value * (maxYawDegrees - minYawDegrees);
float pitch = minPitchDegrees + Random.value * (maxPitchDegrees - minPitchDegrees);
Vector3 position = RotationHelper.ConvertYawPitch (Vector3.forward * distance, yaw, pitch);
Instantiate (objectToSpawn, position, Quaternion.identity);
}
}
}
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public static class RotationHelper {
public static Vector3 ConvertYawPitch(Vector3 vector, float yaw, float pitch)
{
Quaternion yawRotation = Quaternion.AngleAxis (yaw, Vector3.up);
Vector3 yawedZAxis = yawRotation * Vector3.left;
Quaternion pitchRotation = Quaternion.AngleAxis (pitch, yawedZAxis);
Vector3 yawedVector = yawRotation * vector;
Vector3 position = pitchRotation * yawedVector;
return position;
}
}
In your specific case, the parameters should be:
minDistance = 20
maxDistance = 20
minPitchDegrees = 0
maxPitchDegrees = 0-90, whatever the angle is after you "cut off the top"
minYawDegrees = -180
maxYawDegrees = 180

I want objects to spawn randomly at a distance of 20 from a FPS
player.
What I understood from this is that you want to spawn objects on the ground, distant 20 units away from the player, in random directions.
You could say the objects need to spawn on the surface of a half
sphere with the player as the center.
Now, this is just another way to make things complex. No need to use the sphere to solve this.
If you want to spawn objects on the surface, easiest solution will be to get a random angle in relation with Vector3.up and walk for 20 units to find the desired point.
Script:
public class Spawner : MonoBehaviour
{
public Transform player;
public Transform prefab;
[Range(10,50)]
public float distance = 20f;
IEnumerator Start()
{
while (true)
{
yield return new WaitForSeconds(0.05f);
Spawn();
}
}
[ContextMenu("Spawn")]
public void Spawn()
{
Vector3 spawnPoint = FindPoint(player.position, distance, Random.Range(0, 360));
Instantiate(prefab, spawnPoint, Quaternion.identity, transform);
}
[ContextMenu("Clear")]
public void Clear()
{
foreach (var item in transform.GetComponentsInChildren<Transform>())
{
if (item != transform)
DestroyImmediate(item.gameObject);
}
}
Vector3 FindPoint(Vector3 center, float radius, int angle)
{
return center + Quaternion.AngleAxis(angle, Vector3.up) * (Vector3.right * radius);
}
}
Result:
Calculates random point based on player's position:
Hope this helps :)

Creating a Google Earth like navigation for a sphere

This question is about Unity3D.
I want to create a navigation similar to Google Earth where you click and drag on a sphere and let the camera orbit accordingly. It is important that the point that was grabbed is always under the mouse position while dragging. The navigation should also work if I zoom close to the sphere. I do not want to rotate the sphere itself. Just exactly like Google Earth does it.
My attempt is to project the mouse position to the sphere if I start to drag. On the next frame I do the same and calculate the angle between the start drag and end drag position.
private void RotateCamera(Vector3 dragStart, Vector3 dragEnd)
{
// calc the rotation of the drag
float angle = Vector3.Angle(dragStart, dragEnd);
// rotate the camera around the sphere
Camera.main.transform.RotateAround(sphere), Vector3.up, angle);
}
I thought of using Unitys RotateAround method to rotate the camera with the calculated angle. Unfortunately I do not have the rotation vector (using Vector3.up in the example is obviously wrong).
Does somebody know how I can calculate this vector to apply it for the method? Am I on the right direction to implement the Google Earth navigation?
Thank You!
UPDATE
I am very close with a new solution. I project the drag vectors to a down and a right plane to get the angles. Afterwards I rotate the camera around up and left. This works well until I reach the poles of the sphere. The camera rotates a lot around itself if I reach a pole.
private void RotateCamera(Vector3 dragStart, Vector3 dragEnd)
{
Vector3 plane = Vector3.down;
var a = Vector3.ProjectOnPlane(dragStart, plane);
var b = Vector3.ProjectOnPlane(dragEnd, plane);
float up = Vector3.SignedAngle(a, b, plane);
plane = Vector3.right;
a = Vector3.ProjectOnPlane(dragStart, plane);
b = Vector3.ProjectOnPlane(dragEnd, plane);
float left = Vector3.SignedAngle(a, b, plane);
Camera.main.transform.RotateAround(_sphere, Vector3.up, up);
Camera.main.transform.RotateAround(_sphere, Vector3.left, left);
}

Turns out that is was easier than I expected. I thought about calculating the rotation axis and came to the conclusion that is must be the cross product of the start and end vector. Take a look at the solution. The RotateCamera method is where the math magic happens :)
public class GoogleEarthControls : MonoBehaviour
{
private const int SpehreRadius = 1;
private Vector3? _mouseStartPos;
private Vector3? _currentMousePos;
void Start () {
// init the camera to look at this object
Vector3 cameraPos = new Vector3(
transform.position.x,
transform.position.y,
transform.position.z - 2);
Camera.main.transform.position = cameraPos;
Camera.main.transform.LookAt(transform.position);
}
private void Update()
{
if (Input.GetMouseButtonDown(0)) _mouseStartPos = GetMouseHit();
if (_mouseStartPos != null) HandleDrag();
if (Input.GetMouseButtonUp(0)) HandleDrop();
}
private void HandleDrag()
{
_currentMousePos = GetMouseHit();
RotateCamera((Vector3) _mouseStartPos, (Vector3)_currentMousePos);
}
private void HandleDrop()
{
_mouseStartPos = null;
_currentMousePos = null;
}
private void RotateCamera(Vector3 dragStartPosition, Vector3 dragEndPosition)
{
// in case the spehre model is not a perfect sphere..
dragEndPosition = dragEndPosition.normalized * SpehreRadius;
dragStartPosition = dragStartPosition.normalized * SpehreRadius;
// calc a vertical vector to rotate around..
var cross = Vector3.Cross(dragEndPosition, dragStartPosition);
// calc the angle for the rotation..
var angle = Vector3.SignedAngle(dragEndPosition, dragStartPosition, cross);
// roatate around the vector..
Camera.main.transform.RotateAround(transform.position, cross, angle);
}
/**
* Projects the mouse position to the sphere and returns the intersection point.
*/
private static Vector3? GetMouseHit()
{
// make sure there is a shepre mesh with a colider centered at this game object
// with a radius of SpehreRadius
RaycastHit hit;
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit))
{
return hit.point;
}
return null;
}
}

Basic rotation based on mouse drag, based on what you have:
Transform camTransform = Camera.main.transform;
if (Input.GetMouseButton(0))
{
camTransform.RotateAround(currentLookTargetTransform.position, -camTransform.right * Input.GetAxis("Mouse Y") + camTransform.up * Input.GetAxis("Mouse X"), 120 * Time.deltaTime);
}
You can multiply the relative direction by the mouse change value to get the axis. Then you can supplant your clamp points in; but the point was to rotate it relatively.