In my scenario, I have a table (plane) that a ball will roll around on using nothing but physics giving the illusion that the mobile device is the table using Input.gyro.attitude. Taking it one step further, I would like this relative to the device origin at the time Start() is called, so if it is not being held in front of a face or flat on the table, but just relative to where it started, and may even be reset when the ball is reset. So the question is, is how do I get the difference between the current attitude and the origin attitude, then convert the X and Z(?) difference into a Vector3 to AddForce() to my ball object whilst capping the max rotation at about 30 degrees? I've looked into a lot of Gyro based input manager scripts and nothing really helps me understand the mystery of Quaternions.
I could use the relative rotation to rotate the table itself, but then I am dealing with the problem of rotating the camera along the same rotation, but also following the ball at a relative height but now with a tilted offset.
AddForce() works well for my purposes with Input.GetAxis in the Editor, just trying to transition it to the device without using a Joystick style UI controller.
Edit: The following code is working, but I don't have the right angles/euler to give the right direction. The game is played in Landscape Left/Right only, so I should only need a pitch and yaw axis (imagine the phone flat on a table), but not roll (rotated around the camera/screen). I may eventually answer my own question through trial and error, which I am sure is what most programmers do.... XD
Started on the right track through this answer:
Answer 434096
private Gyroscope m_Gyro;
private speedForce = 3.0f;
private Rigidbody rb;
private void Start() {
m_Gyro = Input.gyro;
m_Gyro.enabled = true;
rb = GetComponent<Rigidbody>();
}
private Vector3 GetGyroForces() {
Vector3 resultantForce = Vector3.zero;
//Quaternion deviceRotation = new Quaternion(0.5f, 0.5f, -0.5f, -0.5f) * m_Gyro.attitude * new Quaternion(0,1,0,0);
float xForce = GetAngleByDeviceAxis(Vector3.up);
float zForce = GetAngleByDeviceAxis(Vector3.right);
//float zForce = diffRot.z;
resultantForce = new Vector3(xForce, 0, zForce);
return resultantForce;
}
private float GetAngleByDeviceAxis(Vector3 axis) {
Quaternion currentRotation = m_Gyro.attitude;
Quaternion eliminationOfOthers = Quaternion.Inverse(Quaternion.FromToRotation(axis, currentRotation * axis));
Vector3 filteredEuler = (eliminationOfOthers * currentRotation).eulerAngles;
float result = filteredEuler.z;
if (axis == Vector3.up) {
result = filteredEuler.y;
}
if (axis == Vector3.right) {
result = (filteredEuler.y > 90 && filteredEuler.y < 270) ? 180 - filteredEuler.x : filteredEuler.x;
}
return result;
}
void FixedUpdate() {
#if UNITY_EDITOR
rb.AddForce(new Vector3(Input.GetHorizontal * speedForce, 0, Input.GetVertical * speedForce));
#endif
#if UNITY_ANDROID
rb.AddForce(GetGyroForces);
#endif
}
Related
I'm adding the option for players to move the camera to the sides. I also want to limit how far they can move the camera to the sides.
If the camera was aligned with the axis, I could simply move around X/Z axis and set a limit on each axis as to how far it can go. But my problem is that the camera is rotated, so I'm stuck figuring out how to move it and set a limit. How could I implement this?
using UnityEngine;
[RequireComponent(typeof(Camera))]
public class CameraController : MonoBehaviour
{
Camera cam;
Vector3 dragOrigin;
bool drag = false;
void Awake()
{
cam = GetComponent<Camera>();
}
void LateUpdate()
{
// Camera movement with mouse
Vector3 diff = (cam.ScreenToWorldPoint(Input.mousePosition)) - cam.transform.position;
if (Input.GetMouseButton(0))
{
if (drag == false)
{
drag = true;
dragOrigin = cam.ScreenToWorldPoint(Input.mousePosition);
}
}
else
{
drag = false;
}
if (drag)
{
// Here I want to set a constraint in a rectangular plane perpendicular to camera view
transform.position = dragOrigin - diff;
}
}
}
Transform in Unity comes with a handy Transform.right property, which regards the object's rotation. To move your camera sideways you could further utilize Lerp to make the movement smooth.
transform.position += transform.right * factor
moves an object to the right.
Use factor to adjust the desired distance and by doing so you can also set limits. Negative factor would mean moving left by the way:) Hope that helps!
It can be tricky to deal with constraints on rotated objects. The math behind this includes some vector/rotation math to figure out the correct limits relative to the object's orientation, and whether you've exceeded them.
Luckily though, Unity gives you some shortcuts to skip this math: Transform.InverseTransformPoint() and Transform.TransformPoint()! These two methods allow you to transform a point in world space into a point in local space, and vice versa.
That means that no matter how your camera is oriented, you can interpret a position from the orientation of the camera - and with just a couple extra steps, your X/Z constraints are usable because you can calculate X/Z from the camera's point of view.
Let's try to adapt your current script to use this:
using UnityEngine;
[RequireComponent(typeof(Camera))]
public class CameraController : MonoBehaviour
{
// Set the X and Z values in the editor to define the rectangle within
// which your camera can move
public Vector3 maxConstraints;
public Vector3 minConstraints;
Camera cam;
Vector3 dragOrigin;
bool drag = false;
Vector3 cameraStart;
void Awake()
{
cam = GetComponent<Camera>();
// Here, we record the start since we'll need a reference to determine
// how far the camera has moved within the allowed rectangle
cameraStart = transform.position;
}
void LateUpdate()
{
// Camera movement with mouse
Vector3 diff = (cam.ScreenToWorldPoint(Input.mousePosition)) - cam.transform.position;
if (Input.GetMouseButton(0))
{
if (drag == false)
{
drag = true;
dragOrigin = cam.ScreenToWorldPoint(Input.mousePosition);
}
}
else
{
drag = false;
}
if (drag)
{
// Now, rather than setting the position directly, let's make sure it's
// within the valid rectangle first
Vector3 newPosition = dragOrigin - diff;
// First, we get into the local space of the camera and determine the delta
// between the start and possible new position
Vector3 localStart = transform.InverseTransformPoint(cameraStart);
Vector3 localNewPosition = transform.InverseTransformPoint(newPosition);
Vector3 localDelta = localNewPosition - localStart;
// Now, we calculate constrained values for the X and Z coordinates
float clampedDeltaX = Mathf.Clamp(localDelta.x, minConstraint.x, maxConstraint.x);
float clampedDeltaZ = Mathf.Clamp(localDelta.z, minConstraint.z, maxConstraint.z);
// Then, we can use the constrained values to determine the constrained position
// within local space
Vector3 localClampedPosition = new Vector3(clampedDeltaX, localDelta.y, clampedDeltaZ)
+ localStart;
// Finally, we can convert the local position back to world space and use it
transform.position = transform.TransformPoint(localConstrainedPosition);
}
}
}
Note that I'm somewhat assuming dragOrigin - diff moves your camera correctly in its present state. If it doesn't do what you want, please include details on the unwanted behaviour and we can sort that out too.
Im trying to code so that my Character dashes to the right when pressing the Left mouse button, but instead of dashing it just starts slowly glieding or lets say floating.
This is the code i´ve used;
if (Input.GetMouseButton(0))
{
rb.velocity = Vector2.right * DashSpeed;
}
Im not sure but a other part of my code might be the reason for this problem but if so i would like to know how i could solve it. Thats the part im talking about
rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
thats the code im using for movement.
void Start()
{
cam = Camera.main;
rb = GetComponent<Rigidbody2D>();
}
private void Update()
{
horizontal = Input.GetAxisRaw("Horizontal");
animator.SetFloat("Horizontal", Input.GetAxis("Horizontal"));
if (Input.GetKeyDown(KeyCode.Space) && isGrounded == true)
{
float jumpVelocity = 7f;
rb.velocity = Vector2.up * jumpVelocity;
jumpsound.Play();
}
Vector3 worldPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
if (Input.GetKey(KeyCode.RightAlt))
{
Dashing();
}
}
void FixedUpdate()
{
isGrounded = Physics2D.OverlapCircle(groundCheck.position, CheckRadius, whatisGround);
moveInput = Input.GetAxisRaw("Horizontal");
rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
if (Input.GetKeyDown(KeyCode.Escape))
{
SceneManager.LoadScene("Main menu");
}
}
void Dashing()
{
rb.AddForce(Vector2.right * DashSpeed, ForceMode2D.Impulse);
}
The issue with your current code is you are directly changing velocity in a few places. Some basic physics, the integral of position vs. time graph is velocity, and the integral of velocity is acceleration vs. time. To get a more realistic movement, it is better to apply a Force to objects. When doing this, the physics engine Unity uses can add a new force at a given time, then using acceleration can accelerate the object in that direction over time, then can change the velocity over time which will result in the position changing over time.
The example code you posted, you are directly setting velocity in a few places.
rb.velocity = Vector2.up * jumpVelocity; (Jump)
rb.velocity = new Vector2(moveInput * speed, rb.velocity.y); (Movement)
rb.velocity = Vector2.right * DashSpeed; (Dash)
When directly setting these values, the new values overwrite the old ones. As your movement code is not in any sort of if conditional it will continually write to the velocity causing the dash to never change anything regardless if you use add-force or change velocity directly.
I would consider making both your jump and dash use AddForce, and if you like the feel of your movement by applying velocity directly, then add the velocity do not set it.
Your previous line rb.velocity = new Vector2(moveInput * speed, rb.velocity.y); would then become rb.AddForce(new Vector2(moveInput * speed, 0), ForceMode2D.Impulse);. Similarly you can update your jump and dash to match this. Let me know if you get this working or have more questions.
It could be a problem with your animation. Link to a thread on unity answers:
https://answers.unity.com/questions/674516/rigidbody-character-problems-constant-floating-jum.html
You should go over to the animation place and hit bake into pose.
You should use the Rigidbody2D.AddForce(Vector2, ForceMode2D). What this does is moving the GameObject in the direction of the Vector2, with the force mode of ForceMode2D. What is different about this from just translating it, is that it interacts with physics and improves the quality of your game. Here is a link, and the script:
https://docs.unity3d.com/ScriptReference/Rigidbody2D.AddForce.html
Rigidbody2D rb;
float dashSpeed;
void Update()
{
if (Input.GetMouseButton(0))
{
rb.AddForce(Vector2.right * dashSpeed);
}
}
And if the other part of the code you were talking about, if that is glitching, then do the same trick.
My character is a car and I try to rotate it the direction it move, so far so good I succeeded to do that but once I stop moving the character flips back to the direction it was on the start.
Also how can I make my turns from side to the opposite site smooth ?
Here is my code so far:
[SerializeField] float driveSpeed = 5f;
//state
Rigidbody2D myRigidbody;
// Start is called before the first frame update
void Start()
{
myRigidbody = GetComponent<Rigidbody2D>();
}
// Update is called once per frame
void Update()
{
Move();
}
private void Move()
{
//Control of velocity of the car
float HorizontalcontrolThrow = CrossPlatformInputManager.GetAxis("Horizontal"); // Value between -1 to 1
float VerticalcontrolThrow = CrossPlatformInputManager.GetAxis("Vertical"); // Value between -1 to 1
Vector2 playerVelocity = new Vector2(HorizontalcontrolThrow * driveSpeed, VerticalcontrolThrow * driveSpeed);
myRigidbody.velocity =playerVelocity;
**//Direction of the car**
Vector2 direction = new Vector2(HorizontalcontrolThrow, VerticalcontrolThrow);
float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
myRigidbody.rotation = angle;
}
I'm not sure about this, but maybe that last line "myRigidbody.rotation = angle" being called every frame is what is making your car reset its rotation.
Maybe change it to "myRigidbody.rotation *= angle" or "myRigidbody.rotation += angle".
It looks like it may be because HorizontalcontrolThrow and VerticalcontrolThrow are going to be reset when you release the controls. If it's resetting to its original orientation, then what's happening is that until you move, those two values are going to be at their default value. You then move and it affects the rotation. But when you release the controls, those values are back to the starting values again, and so is your rotation.
What you therefore need to do is try to separate the HorizontalcontrolThrow and VerticalcontrolThrow from the rest of the code, which should only be activated when at least one of these two variables are not at their default setting (I can't remember what the axis functions return at the moment).
Edit:
An IF statement should suffice (some rough pseudo code):
if (horizontalAxis != default || verticalAxis != default)
{
Rotate/Move
}
I solved the snap rotation using Quaternion at rotation, the issiu I had with it was to convert it from 3d to 2d, through the guide of this clip: youtube.com/watch?v=mKLp-2iseDc and made my adjustments it works just fine !
I am trying to create a game in Unity where the player can only move in the direction it is facing, but the following code allows the player to move in all 4 directions.
(This is for a 3D project)
Any help would be appreciated! Thanks!
public class PlayerController : MonoBehaviour {
public float speed;
private Rigidbody rb;
void Start() {
rb = GetComponent<Rigidbody>();
}
void FixedUpdate() {
float moveHorizontal = Input.GetAxis("Horizontal");
float moveVertical = Input.GetAxis("Vertical");
Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
rb.AddForce(movement * speed);
}
}
So I didn't get what you wanted: first you said you wanted it to move only forward, then the only thing you have to do is get when he pressed a key and move forward while is not unpressed.
If you wanted to say that it can move all directions BUT only one at a time, the you will have to put the same code but with some changes:
First of all to make it move forward you have to get the forward of the transform, otherwise it will move in the same direction if you rotate it (you don't want that, no?).
Vector3 moveDirection = (transform.forward * Input.GetAxis("Vertical") + transform.right * Input.GetAxis("Horizontal")).normalized;
moveDirection.y = 0;
rb.velocity = moveDirection;
Then, to make that it ONLY moves to one direction at a time, you have to put the priority of the greatest axis number and if it's equal then you should think if you want to move forward or right (with it's axis value).
From the code you posted, I'm not sure where you are storing the player's facing-direction. However, I presume that it is stored as a Quaternion. If you have a player rotation quaternion called playerRotation, then you could do this (warning - untested):
Vector3 input = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
Vector3 normal = playerRotation * Vector3.forward;
Vector3 movement = Vector3.Dot(normal, input) * input;
If the game is first-person, then you can take a shortcut and just use Camera.current.transform.forward instead of the normal vector.
This will project the input direction onto the normal with the player's facing direction so that your movement force can only be in that direction.
I have the following code which works really well for scrolling map using the draggable mouse. I am trying to define limits so that I cannot scroll too far in either the x or y co-ordinates. I've seen various examples of code, such as:
"transform.position.x = Mathf.Clamp(-100, 100);" though have not been able to incorporate it into the code. I am a bit of a beginner to all this and have just done a 2D tutorial animating zombies and have a camera that can scroll, but would like to add limits to how far it can scroll in any given directions.
Thanks heaps
Adam
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(){
// From the Unity3D docs: "The z position is in world units from the camera." In my case I'm using the y-axis as height
// with my camera facing back down the y-axis. You can ignore this when the camera is orthograhic.
current_position.z = hit_position.z = camera_position.y;
// Get direction of movement. (Note: Don't normalize, the magnitude of change is going to be Vector3.Distance(current_position-hit_position)
// anyways.
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;
}
}
What exactly is the error you are getting? I imagine it is something along the lines of being unable to modify the return value of position because it is not a variable.
If this is the case, you should however be able to set the whole position vector at once. So try something along the lines of this:
var pos = transform.position;
transform.position = new Vector3(
Math.clampf(pos.x, -100, 100),
Math.clampf(pos.y, -100, 100),
pos.z
);
You may need to swap around clamping Y and Z, depending on how you are using them.