I want to move a rigid body in an elliptical movement like the player movement "whale trail" game.What I did is:
Created a Cube called "Player" with scale(1.5,0.5,0.1)
Created another small cube called Point with scale(0.1,0.1,0.1) and positioned same as Player but 0.5 more in x (So that now the player looks like a 2D rectangle and a point on it little right to the centre of the rectangle).
Then I created a fixed joint between both bodies
Now I applied for on the player at the position of the Point as follows ,
float mfAngle = 0.0f;
void update()
{
mfAngle=transform.eulerAngles.z;
mfAngle=mfAngle%360;
if(mfAngle>=0 && mfAngle<90)
{
mfXforce=-0.1f;
mfYforce=0.1f;
}
if(mfAngle>=90 && mfAngle<180)
{
mfXforce=-0.1f;
mfYforce=0.1f;
}
if(mfAngle>=180 && mfAngle<270)
{
mfXforce=-0.1f;
mfYforce=-0.1f;
}
if(mfAngle>=270 && mfAngle<360)
{
mfXforce=0.1f;
mfYforce=-0.1f;
}
Debug.Log("Angle ="+mfAngle+"X = "+mfXforce+"Y = "+mfYforce);
Vector3 pointPos=_goPointObject.transform.position;
transform.rigidbody.AddForceAtPosition(new Vector3(mfXforce,mfYforce,0),pointPos);
}
But it doesn't works fine.I just moves upwards and the turns and moves in different direction.If anyone know how to move the rigid body in elliptical motion by applying force give me a solution.(I want to use it as like whale trail game u can see the video of the "loop movement" in this http://www.youtube.com/watch?v=wwr6c2Ws1yI video).Thanks in advance.
I had found the solution by myself.To achieve that elliptical movement u have to create two bodies and connect them with joint by placing it horizontally next to each other.Then u have to apply force in x direction constantly and in Y direction only when the Screen is be touched on the first body.
And its important to reduce the X speed when moving up then u will get that elliptical rotation.
It works fine for me.
Thanks,
Ashokkumar M
Related
I am creating a 2D platformer type game, and it has non flat terrain. How do I make it so that my character's legs always smoothly transition from a flat surface to a slope surface?
For reference you can check out [Alto's Adventure] (http://altosadventure.com/) (mobile). In that, the skateboard snaps to the curvy terrain.
Feel free to ask for more details.
To make such a possibility, you have to send a ray to the ground and then set the direction of up transform according to the Normal vector point of impact. The following code solves the basic problem.
public LayerMask groundLayer;
public float maxRayLength = 3;
public float offset = .5f; // set it to half of your character height
public void Update()
{
var ground = Physics2D.Raycast(transform.position, -transform.up, maxRayLength, groundLayer.value);
if (ground)
{
transform.up = ground.normal;
transform.position = new Vector3(ground.point.x, ground.point.y) + transform.up*offset;
}
}
In addition to the script, you must specify a suitable 2D collider as well as its layer. For layers, make sure that both the script inspector and the layer are set to the hypothetical ground layer.
Example Result:
I have a simple cannon I am trying to program to shoot a projectile. I have 4 game objects:
The tank object
A Pivot Object (child of tank)
A Cannon Object (child of pivot)
An empty GameObject called Tip which sits just above the cannon (child of cannon)
My code for the cannon object is below:
public class cannon: MonoBehaviour
{
public float power = 1.0f;
public Transform projectile;
void Update()
{
if (Input.GetButtonDown("Fire1"))
{
Transform bullet;
Vector2 pos = transform.GetChild(0).position;
bullet = Instantiate(projectile, pos, Quaternion.identity);
Rigidbody2D bullet_rb = bullet.GetComponent<Rigidbody2D>();
bullet_rb.AddForce(pos * power);
}
}
}
Everything seems to work okay, until I looked at the trajectory of the projectiles when the cannon is aimed directly along the x-axis. There is still a small y component to the applied force, which I didn't expect and do not desire.
Here's a gif:
What could be causing this behavior?
The force you're adding is pos (times a scalar power)... The position of your cannon is above zero on the y axis, so that's why it launches with a y offset. I'm assuming it has an x offset too, just less noticeable, because the base (tank) is centered at x while it's above center in the y. Try moving the whole tank setup off away from the scene root; you'll probably see a huge spike in the force of the projectile, because of this error of using pos.
What you want is a vector representing a pure direction instead. One that is also normalized (magnitude of one). In this case, either right (forward in 2d) or up, from the perspective of the rotating tip or cannon.
I am new to unity, and i am trying to create a bouncing ball, so i've did many researches about bouncing realted physics and i found a formula :
Formula:
-2*(V dot N)*N + V
Where V is the velocity vector and N is the normal of the surface on which the ball will bounce
Here is my script :
using UnityEngine;
using System.Collections;
public class BallPhysics : MonoBehaviour {
void Start () {
rigidbody2D.velocity =new Vector2 (-1,-3);
}
// Update is called once per frame
void Update () {
}
void OnTriggerEnter2D(Collider2D col) {
if (col.gameObject.name == "Pong") {
tBounce ();
}
}
void tBounce(){
RaycastHit2D hit = Physics2D.Raycast (new Vector2 (transform.position.x,transform.position.y), new Vector2(-1f,-1f));
Vector2 n = hit.normal;
Vector2 v = rigidbody2D.velocity;
Vector2 R = -2 * (Vector2.Dot (v, n)) * n + v;
rigidbody2D.velocity = R;
}
}
I am giving the ball a velocity vector in the start function, i am using OnTriggerEnter2D for collision handling and raycast2D to get the normal of a surface.
The problem is that the script doesn't reflect the velocity vector called R, i think the probleme is in the normal vector.
For example let's say V is a Vector2(-1,-1) so basically R should be (-1,1), but it's not. R is (3,1) !
i've successfuly been able to make a ball bouncing on Horizontal/vertical surface by reversing the ball velocity but this won't work properly with arbitary angles,that's why i am using this formula.
So what's the problem ?
Your raycast is likely hitting the wrong collider. You start it at transform.position. That is the center point of your ball object.
Imagine a ray coming out of a circle's center. What's the first line it hits? It hits the circle itself first. So your Raycast reports the surface normal of the ball, not the pong paddle.
There are many ways to get around this. You can apply a Physics Layer that ignores raycasts. I think there is one pre-defined like that. You can create custom ones as well and supply a layer mask to your raycast.
There are other ways to solve it like originating the raycast from somewhere else, but since you're doing this as the objects collide, a layer mask is probably the simplest.
I have this cup that contains balls inside. All 2D
I am using Rigidbody2d and Collider2d.
When running in unity and moving the cup (with arrow keys) the balls stay inside the cup. I also added drag movement for Android touch to move the cup.
The problem is that when moving the cup too fast (by draging) the balls fall from the cup collider (using Polygon colider 2d).
Code for movement is:
public float speed = 0.1F;
void Update() {
if (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Moved) {
Vector2 touchDeltaPosition = Input.GetTouch(0).deltaPosition;
transform.Translate(-touchDeltaPosition.x * speed, -touchDeltaPosition.y * speed, 0);
}
}
I tried to play with the speed parameter but it wont really help. if the cup movement is too slow it is not very useful for me.
I believe it is related the velocity/force of the ball or cup which makes the cup collider miss...
Any help on this would be appreciated greatly!
it is because you are moving it by changing the position of the cup, that means that when you move it fast, it disappears, and reappears where you dragged it, leaving the balls behind, and then they fall. I had the same thing where my objects would just go through the walls and out of the camera area. I fixed that by using AddForce. This makes the cup move, position by position over to where you dragged. this bumps the balls along, and they stay in the cup. This is what I guess is going on. If you use velocity that would work to.
you could rather than transform.Translate, you could find the vector to where you want to move to.
var direction = touchDeltaPosition - transform.position;
gameObject.rigidbody2D.velocity.x = direction.x * speed;
gameObject.rigidbody2D.velocity.y = direction.y * speed;
hope this solves it
The problem is that, when you're moving the cup too fast, at Frame 1 the ball is inside the cup, but at Frame 2 it's outside. You can reduce the value of "Fixed Timestep" (http://docs.unity3d.com/Manual/class-TimeManager.html) to increase the frequency of the physics calculations, or make the colliders larger.
If a ball in the cup will always stay in the cup, maybe you can turn off the physics of the ball once it's in the cup, or something along those lines.
Usually transform.Translate() is not very efficient when dealing with colliders, instead, you can try three other solutions:
1) rigidbody2D.AddForce(Vector2.Up * Input.GetAxis("Vertical"));
2) rigidbody2D.velocity = new Vector2(//write what you need);
3) which I consider the best solution for dealing with colliders and dragging is : MoveRigidbody2D
Well, this is what worked for me:
var newVec = new Vector2 (transform.position.x, transform.position.y);
var touchDeltaPosition = Input.GetTouch(0).deltaPosition*touchSpeed;
var direction = touchDeltaPosition- newVec;
rigidbody2D.AddForce(direction);
I am making a game in which the balls are falling down on a plane one ball fall over the other ball and they make a line, which goes from bottom to top. I want that at certain point on y axis the ball stop falling. Don't know how to do it the code I used until now for balls to fall down is:
function calling(){
functionsRandom.Range(0, functions.Length);
}
function sphereA() {
var go = Instantiate(sphere,new Vector3(Random.Range(-3, 3),Random.Range(-3,3),-12.78451),Quaternion.identity);
go.renderer.material.color = Color(Random.value, Random.value, Random.value);
}
function sphereB() {
var go = Instantiate(sphere1,new Vector3(Random.Range(-3, 3),Random.Range(-3,3),-12.78451),Quaternion.identity);
go.renderer.material.color = Color(Random.value, Random.value, Random.value);
}
I used random.range, so that the ball falls from points between it both in x and y, for x it is working, but it is not working for y.
Add all the instantiated spheres to an array go[] instead of go. which are in line. Now at certain point where you want to stop generating other spheres, take the count of the sphere in the array. If the count is equal to the max limit. Then DON'T instantiate the spheres. If any doubts, come to unity3d chatroom.