I have a model that i need to animate, i need to rotate it from 0 to 45 degrees on an axis in duration of 2 seconds, is there a easier way to do it, now i just create a timer with a boolean to switch the animation off
Timer.schedule(new Task() {
#Override
public void run() {
stopAnim = true;
}
}, 2);
and in the render method
if (stopAnim = false){
bodyModelInstance.transform.rotate(Vector3.Y, 40 * delta);
}
I guess the perfect thing for you would be Universal Tween Engine.
It's easy, and you can create complex animations easily with less code and in less time.
Hope this helps.
Good luck.
Related
I've been making some simple games using processing and box2D using The Nature of Code as a resource.
My problem is I have gotten to a point where I have these windmills that go clockwise/counterclockwise depending on the speed of the motor (I am using PI/2 and -PI*2). I want to have it so that the user can change this speed from positive and negative by pressing a key or mouse button. Looking around online people and the box2D documentation are saying to use the function void SetMotorSpeed(float speed);, however I am not having luck figuring out how to implement this. I've tried a few ways I can think but no luck.
Currently I have this in my main file ("s" is the name of the instance of the windmill):
// Click the mouse to switch speed of motor
void mousePressed() {
s.SetMotorSpeed(s.speed);
}
And I have this in the file for the windmill:
//Set Motor Speed
void SetMotorSpeed(float speed){
speed = speed * -1;
}
This doesn't work though.
I'm fairly new to coding and this is my first post on stack-overflow so my apologies if I have done anything wrong in how I'm asking or presenting this question. I'm open to suggestions both code and etiquette wise!
Here is the code for the entire windmill:
class Seesaw {
// object is two boxes and one joint
RevoluteJoint joint;
// float speed = PI*2;
Box box1;
Box box2;
float speed = PI*2;
Seesaw(float x, float y) {
// Initialize locations of two boxes
box1 = new Box(x, y-20, 120, 10, false);
box2 = new Box(x, y, 10, 40, true);
// Define joint as between two bodies
RevoluteJointDef rjd = new RevoluteJointDef();
Vec2 offset = box2d.vectorPixelsToWorld(new Vec2(0, 60));
rjd.initialize(box1.body, box2.body, box1.body.getWorldCenter());
// Turning on a motor (optional)
rjd.motorSpeed = PI*2; // how fast?
rjd.maxMotorTorque = 1000.0; // how powerful?
rjd.enableMotor = true; // is it on?
// Create joint
joint = (RevoluteJoint) box2d.world.createJoint(rjd);
}
// Turn the motor on or off
void toggleMotor() {
joint.enableMotor(!joint.isMotorEnabled());
}
boolean motorOn() {
return joint.isMotorEnabled();
}
void SetMotorSpeed(float speed){
speed = -speed;
}
void display() {
box2.display();
box1.display();
// Draw anchor just for debug
Vec2 anchor = box2d.coordWorldToPixels(box1.body.getWorldCenter());
fill(255, 0, 0);
stroke(0);
ellipse(anchor.x, anchor.y, 4, 4);
}
}
The change in speed should be communicated to the joint. Try this:
void SetMotorSpeed(float speed) {
s.joint.setMotorSpeed(speed); // edited, processing/java uses camel-case
}
you might also be a bit more careful about naming variables. In your original post you use the same name for the local variable and the member variable, which has not the wanted effect. Most people use some naming convention for member variable to avoid this kind of very common error. Like for instance have all member variables all start with "_"
void SetMotorSpeed(float speed) {
_speed = -speed; // speed is local!
}
I have 20 spites, I want them to be animated when a button is clicked.
Two types of animations 1) Position 2) Rotation.
Is there a recommended way to do this? Only way I can think of is recursively call setposition and angle with a delta value on Render method till the desired position and angle are reached.
When you have a start state and an end state, and you want to fill in the middle states, this is known as 'tweening (from inbetween). It comes from cartoon animation, but has come to be used more generally.
LibGDX makes use of Universal Tween Engine. You can start your journey to animating anything you want here. But, to give a bit more detail on how it works, here is an example from some of my own stuff. A similar usecase with regards to a sprite, but I have my sprites wrapped in a more generic class, a JJRenderNode. Here is how I make my class open to being tweened.
First you need a TweenAccessor for the class you want to tween.
public class RenderNodeTweenAccessor implements TweenAccessor<JJRenderNode> {
public static final int WIDTH = 1;
public static final int HEIGHT = 2;
public static final int WIDTH_HEIGHT = 3;
public static final int ALPHA = 4;
public static final int ALPHA_WIDTH_HEIGHT=5;
#Override
public int getValues(JJRenderNode target, int tweenType, float[] returnValues) {
switch (tweenType) {
case WIDTH:
returnValues[0] = target.getWidth();
return 1;
case HEIGHT:
returnValues[0] = target.getHeight();
return 1;
case WIDTH_HEIGHT:
returnValues[0] = target.getWidth();
returnValues[1] = target.getHeight();
return 2;
case ALPHA:
returnValues[0] = target.getColour().a;
return 1;
case ALPHA_WIDTH_HEIGHT:
returnValues[0] = target.getColour().a;
returnValues[1] = target.getWidth();
returnValues[2] = target.getHeight();
return 3;
default:
assert false;
return -1;
}
}
#Override
public void setValues(JJRenderNode target, int tweenType, float[] newValues) {
switch (tweenType) {
case WIDTH:
target.setWidth(newValues[0]);
break;
case HEIGHT:
target.setHeight(newValues[0]);
break;
case WIDTH_HEIGHT:
target.setWidth(newValues[0]);
target.setHeight(newValues[1]);
break;
case ALPHA:
target.getColour().a=newValues[0];
break;
case ALPHA_WIDTH_HEIGHT:
target.getColour().a=newValues[0];
target.setWidth(newValues[1]);
target.setHeight(newValues[2]);
default:
break;
}
}
}
The constant ints and the 'tweenType' in each of the get and set methods let you tween more than one combination of fields. In this case I have different combinations of width, height and alpha values for my JJRenderNode.
You have to register this TweenAccessor as follows:
Tween.registerAccessor(JJRenderNode.class, new RenderNodeTweenAccessor());
And then you are free to tween your class, for example:
Timeline.createSequence()
.push(Tween.set(node, RenderNodeTweenAccessor.WIDTH_HEIGHT).target(START_WIDTH, START_WIDTH))
.push(Tween.to(node, RenderNodeTweenAccessor.WIDTH_HEIGHT, 0.4f).target(PuzzleBlockCore.MAX_RENDER_WIDTH, PuzzleBlockCore.MAX_RENDER_WIDTH))
.start(JJ.tweenManager);
PS. You also need an instance of a TweenManger, and this needs to be updated with delta for each gameloop. I have a 'singleton' global instance that I use everywhere (JJ.TweenManager).
You might as well use spine 2d for animation. It costs, but it is worth it. For $60 I think, you get full libgdx support + bone rigging and animation.
http://esotericsoftware.com/
If you do want to animate with only libgdx however, you can create a list with all your sprite animations frames, loop through, and switch sprite texture to next frame in the animation.
private void render() {
sprite.set(aninationframes.get(currentFrame)
currentFrame = currentFrame + 1}
Though, you may want to add a delay per frame.
If(current time - time > some value) {
sprite.set(animationframes.get(currrntFrame)
currentFrame = currentFrame + 1
time = get current time here
}
I have a punch animation with, let's assume, 5 frames;
the second frame is the punch collision itself. I wanna be able to duplicate this keyframe and move the following frames forward.
I wanna be able to do this when there is a collision. Making the animation slower doesn't work because it would delay the whole frames.
any tips
Maybe you could pause the animation, wait for a few frames, and then resume it. Animation can be paused by setting Animator.speed to 0. Something like this:
public class PunchAnimation : MonoBehaviour {
public Animator animator;
public float delay;
IEnumerator WaitAndResume(Animator animator, float delay) {
animator.speed = 0;
yield return new WaitForSeconds(delay);
animator.speed = 1;
}
void OnCollisionEnter(Collision c) {
StartCoroutine(WaitAndResume(animator, delay));
}
}
How can I move/animate/translate/tween an Image from position A to position B using C# code in Unity 4.6?
Assuming Image is a GameObject, so it could be a Button or whatever.
There has to be a one-liner for this, right? I've been googling for a while but all I can see out-of-the-box is stuff done in Update, and I firmly believe doing stuff in Update is not a fast way of scripting things.
maZZZu's method will work, however, if you do NOT want to use the Update function, you can use an IEnumerator/Coroutine like so…
//Target object that we want to move to
public Transform target;
//Time you want it to take before it reaches the object
public float moveDuration = 1.0f;
void Start ()
{
//Start a coroutine (needed to call a method that returns an IEnumerator
StartCoroutine (Tween (target.position));
}
//IEnumerator return method that takes in the targets position
IEnumerator Tween (Vector3 targetPosition)
{
//Obtain the previous position (original position) of the gameobject this script is attached to
Vector3 previousPosition = gameObject.transform.position;
//Create a time variable
float time = 0.0f;
do
{
//Add the deltaTime to the time variable
time += Time.deltaTime;
//Lerp the gameobject's position that this script is attached to. Lerp takes in the original position, target position and the time to execute it in
gameObject.transform.position = Vector3.Lerp (previousPosition, targetPosition, time / moveDuration);
yield return 0;
//Do the Lerp function while to time is less than the move duration.
} while (time < moveDuration);
}
This script will need to be attached to the GameObject that you would like to move. You will then need to create another GameObject in the scene that will be your Target…
The code is commented but if you need clarification on something just post a comment here.
If you want to do the movement yourself you can use something like this:
public Vector3 targetPosition = new Vector3(100, 0, 0);
public float speed = 10.0f;
public float threshold = 0.5f;
void Update () {
Vector3 direction = targetPosition - transform.position;
if(direction.magnitude > threshold){
direction.Normalize();
transform.position = transform.position + direction * speed * Time.deltaTime;
}else{
// Without this game object jumps around target and never settles
transform.position = targetPosition;
}
}
Or you can download for example DOTween package and just start the tween:
public Vector3 targetPosition = new Vector3(100, 0, 0);
public float tweenTime = 10.0f;
void Start () {
DOTween.Init(false, false, LogBehaviour.Default);
transform.DOMove(targetPosition, tweenTime);
}
This is a simplified code from what I'm trying to do:
var angle = 1.57;
if ( this.transform.rotation.y > angle ){
this.transform.rotation.y--;
} else if ( this.transform.rotation.y < angle ){
this.transform.rotation.y++;
}
I'm used to code in AS3, and if I do that in flash, it works perfectly, though in Unity3D it doesn't, and I'm having a hard time figuring out why, or how could I get that effect.
Can anybody help me? Thanks!
edit:
my object is a rigidbody car with 2 capsule colliders driving in a "bumpy" floor, and at some point he just loses direction precision, and I think its because of it's heirarchical rotation system.
(thanks to kay for the transform.eulerAngles tip)
transform.rotation retrieves a Quaternion. Try transform.rotation.eulerAngles.y instead.
Transform Rotation is used for setting an angle, not turning an object, so you would need to get the rotation, add your change, and then set the new rotation.
Try using transform.rotate instead.
Check the Unity3d scripting reference here:
http://unity3d.com/support/documentation/ScriptReference/Transform.Rotate.html
I see two problems so far. First the hierarchical rotation of Unity. Based on what you are trying to achieve you should manipulate either
transform.localEulerAngles
or
transform.eulerAngles
The second thing is, you can't modify the euler angles this way, as the Vectors are all passed by value:
transform.localEulerAngles.y--;
You have to do it this way:
Vector3 rotation = transform.localEulerAngles;
rotation.y--;
transform.localEulerAngles = rotation;
You need to create a new Quaternion Object
transform.rotation = Quaternion.Euler ( transform.rotation.x, transform.rotation.y++, transform.rotation.z );
You can also use transform.Rotate function.
The above suggestion to use transform.Rotate( ) is probably what you're going to need to do to actually make it rotate, BUT the variables of transform.Rotate( ) are velocity/speed rather than direction, so transform.Rotate( ) will have to use more than one axis if you want an angled rotation. Ex:
class Unity // Example is in C#
{
void Update( )
{
gameObject.transform.Rotate(0, 1, 0);
}
}
This will rotate the object around its y-axis at a speed of 1.
Let me know if this helps - and if it hinders I can explain it differently.
You should try multiplyng your rotation factor with Time.deltaTime
Hope that helps
Peace
Here is my script for GameObject rotation with touch
//
// RotateController.cs
//
// Created by Ramdhan Choudhary on 12/05/13.
//
using UnityEngine;
using System;
public class RotateController
{
private float RotationSpeed = 9.5f;
private const float mFingerDistanceEpsilon = 1.0f;
public float MinDist = 2.0f;
public float MaxDist = 50.0f;
private Transform mMoveObject = null;
private bool isEnabledMoving = false;
//************** Rotation Controller Constructor **************//
public RotateController (Transform goMove)
{
isEnabledMoving = true;
mMoveObject = goMove;
if (mMoveObject == null) {
Debug.LogWarning ("Error! Cannot find object!");
return;
}
}
//************** Handle Object Rotation **************//
public void Update ()
{
if (!isEnabledMoving && mMoveObject != null) {
return;
}
Vector3 camDir = Camera.main.transform.forward;
Vector3 camLeft = Vector3.Cross (camDir, Vector3.down);
// rotate
if (Input.touchCount == 1) {
mMoveObject.Rotate (camLeft, Input.touches [0].deltaPosition.y * RotationSpeed * Time.deltaTime, Space.World);
mMoveObject.Rotate (Vector3.down, Input.touches [0].deltaPosition.x * RotationSpeed * Time.deltaTime, Space.Self);
}
}
}