I would like to make eight directional movement in my game.
I was successful of doing the movement using rigidBody2D but it wasn't as snappy as I expected. I looked at the scripting API and there looks like alot of ways of moving things around so it's abit intimidating for a noobie like me ;^;. I tried translating but it seems that I didn't put in the right arguments since the player character didn't move(It did compile perfectly fine)
Even though my previous way of moving the character with the rigid body was fine I need snappy tight movement since the game is gonna be a bullet hell similar to Touhou so the smooth velocity based movement won't work well unless I was making a rage game(which I'm not).
I'm thinking that the solution for it is to use position based movement but the API makes finding things abit intimidating.
Edit: Here's the code that wasn't snappy but did make the character move around in eight directions
moveX = Input.GetAxis("Horizontal") * speed;
moveY = Input.GetAxis("Vertical") * speed;
movement = new Vector2(moveX, moveY);
rb.velocity = movement;
This is all inside of the update function.
Related
I'm creating an fps game in unity and chose to not use the included First Person Controller script to reduce complexity. The camera object will constantly be set to the players position and can rotate. I have created a script containing the following code for movement:
float v = Input.GetAxis("Vertical");
float h = Input.GetAxis("Horizontal");
Vector2 rotation = new Vector2(
Mathf.Cos(cam.transform.eulerAngles.y * deg2rad), (Mathf.Sin(cam.transform.eulerAngles.y * deg2rad))
);
rb.velocity = (
new Vector3(
(-rotation.x * h * speed) + (rotation.y * v * speed),
rb.velocity.y,
(-rotation.y * h * speed) + (-rotation.x * v * speed)
)
);
When I test out the game, the movement is correct along the x-axis in both directions, but is unusual when the players y rotation becomes something other than being aligned with the x-axis (Like moving the player backwards will actually move them forwards and visa-versa).
I'm open to an alternative besides using trig functions for the movement, as I have already used transform.forward and transform.right, but they didn't work entirely.
First thing I'd say is that unless you're intending to learn trig and geometrical functions then you should not reinvent the wheel. As you've stated you want to create a FPS game so really you should leverage the scripts and prefabs that others have created to enable the creation of your game.
If you don't want to use the inbuilt FPS Controller script I'd recommend using a free Asset package named '3rdPerson+Fly'. It appears a bit complex at first however you'll learn about states and stackable behaviours/modes which is going to get you an outcome much faster than creating from scratch. You'll also get the flexibility and openness that comes with a non-inbuilt package. This way you can peek at the inner workings if desired or simply build on top of them. Don't fall for NIH (Not Invented Here) syndrome and stand on the shoulders of giants instead :)
Good luck!
The issue you're having is likely caused by the fact that sin and cos can't determine by themselves which "quadrant" they're in. For example 30 degree angle is the same as a 150 degree angle as far as Sin is concerned.
This video is a fast and good explanation of the issue:
https://www.youtube.com/watch?v=736Wkg8uxA8
I'm recreating the movement system from the DS game Dragon Quest Heroes Rocket Slime in Unity. Currently I've got pretty desirable results but it's not 100%.
One of the things that are different is that my player bounces back from walls further on long distance slings than he does in the original game. (left is my recreation, right is original game). Obviously, I can't find out how the game was made and the exact maths/values they use for slinging but one of the things I got from the game is that:
The player moves at constant velocity while slinging in a direction (no slow down, they just stop at a certain point)
Which led me to believe the game doesn't use traditional velocity mechanics so I made it so:
While stretching, the players 'pVelocity' (potentialVelocity) goes up. When they let go a point create at curPlayerPosition + pVelocity is created. I then move the player at a constant velocity to that point. My idea to fix my issue of bouncing too far is by getting the distance from the position where I slung from to the end point and making the player bounce less the larger the distance and further the smaller the distance.
Problem is, I'm not really sure how to do that last part.
Here's my code:
Vector2 reflectedVelocity = Vector2.Reflect(pVelNormalized, foundHit.normal);
playerAnimator.SetFloat("VelocityX", reflectedVelocity.x);
playerAnimator.SetFloat("VelocityY", reflectedVelocity.y);
float DistanceFromOrigin = Vector3.Distance(slingOrigin, transform.position);
print(DistanceFromOrigin);
//ToDo: reflectedVelocity is lower the higher DistanceFromOrigin is.
The other solution I thought of is that maybe my idea of how the 'velocity' works in the original game is completely wrong and if so, please tell me how it actually is/looks to be actually done
reflectedVelocity is lower the higher DistanceFromOrigin is.
So reflectedVelocity should have an inverse relationship with DistanceFromOrigin
Vector2 reflectedVelocity = Vector2.Reflect(pVelNormalized, foundHit.normal);
float DistanceFromOrigin = Vector3.Distance(slingOrigin, transform.position);
if(DistanceFromOrigin == 0) DistanceFromOrigin = 0.00001f;//to avoid division by zero
reflectedVelocity *= (SomeConstant / DistanceFromOrigin);
playerAnimator.SetFloat("VelocityX", reflectedVelocity.x);
playerAnimator.SetFloat("VelocityY", reflectedVelocity.y);
You may use a linear relationship instead of non-linear:
reflectedVelocity *= (SomeConstant - DistanceFromOrigin);
I'm trying to make a very simple race game with spheres, however, I face many problems.
First of all, I'm trying to make a very simple AI system for opponents.
The problem I have here is that I want opponents to detect obstacles and avoid them using Raycast but only a certain type of obstacle , a simple cube is detected.
I've created a simple sphere as opponent and wrote a script so it can move and detect obstacles
Here is update function:
void FixedUpdate()
{
transform.Translate(Vector3.forward * Time.deltaTime * speed);
if (Physics.Raycast(transform.position, transform.forward, 100.0f))
print("There is something in front of the object!");
}
The message is printed only when there is a cube forward and it does not detect any other obstacles. What can be so wrong? Also, is there any idea how to move left or right when opponent raycast an obstacle?
obstacle that is detected
hierarchy
cube01 that is child of obstacle2 that is not detected
Only collider components are detected using raycast, make sure you have an appropriate collider (size of the collider does not necesarily match size of the mesh that gets rendered). Normally also layers on which objects are are important but syntax you are using is not checking for layer mask anyway
Unity Physics Best Practices (As in https://unity3d.com/pt/learn/tutorials/topics/physics/physics-best-practices) recommends that we don't use Raycasts in FixedUpdate, as it is heavy to process and may not always work.
There is also some tips about Matrix Layers that will help you improve performance and avoid such bugs.
Good luck!
You can use Debug.DrawLine() or Debug.DrawLine() to debug the line and see if it cross the obstacles or not.
Here is the documentation for them
DrawRay
DrawLine
For moving right and left I think you can add something like this
void FixedUpdate()
{
Vector3 dir = Vector3.forward * Time.deltaTime * speed;
if (Physics.Raycast(transform.position, transform.forward, 100.0f))
{
print("There is something in front of the object!");
dir += Vector3.Right * horizontalSpeed * Time.deltaTime;
}
}
You might also consider ray casting two rays to detect the direction to lean to if it will be the left or the right.
I'm working on a project in Unity 2D for learning purposes. It's a game of Ping Pong. I have its material so it travels faster every time it bounces. The only problem with its material is that its speed gets out of hand and glitches out. I want to find out a way to stop it.
For example, I would like to know how to keep the ball at a constant speed when it hits peak speed, example, 15f. It is a Rigidbody2d collider ball.
As suggested in this post, you could control the velocity of the
your rigidbody using the Vector2.ClampMagnitude method while tracking it in your OnFixedUpdate(). I'm providing the code in the post I'm citing for your convenience. I edited the code I provided from the cited post to match the recent changes in the API:
float maxVelocity = 10;
void FixedUpdate()
{
rigidbody2D.velocity = Vector2.ClampMagnitude(rigidbody2D.velocity,
maxVelocity);
}
I have a ball game object that I am making bounce using explicit physics equations. I tried using unity's physics engine, but It was not exact enough. I am setting the balls position like so:
float dTime = Time.time - timeSinceBounce;
ballPosition.x -= meterOffset / sensitivity;
ballPosition.y = ballInitialPosition.y + GameConstants.Instance.GetBallYVel ()
* dTime - (float)0.5 * GameConstants.Instance.GetGravity () * dTime * dTime; //Yi+Vy*t-0.5(G)(time^2)
ballPosition.z = (-dTime * GameConstants.Instance.GetBallZVel ()
+ ballInitialPosition.z) * startConstant; //Zi + t*Vz
ball.transform.position = ballPosition;
This code runs in the Update() method. When a collision is detected the time and initial position as reset, and this works. Currently the ball bounces properly but shakes when it is moving quickly. The FPS is at 80. I don't think my equations are wrong because it bounces properly there is just a shake. What is the best way to remove the shake? Thank!
Edit 1: I decided to write my own physics because Unity's physics engine had a lot of other components like friction and roll that were making the ball's bounces vary. Also the camera's x and y is fixed the only thing that is changing is the camera's z position. It works a lot better in fixed update
As of asker's request I hereby add all the details I can, even though without seeing the actual, full and complete code along with seeing this "shake" effect it's challenging to give an exact and proper answer. I'll try and do my best though.So let's do this.
1. "Shaking" reason: most probably you set up some kind of animation, along with a forced positioning/rotation/etc and these two codes work against each other. Double-check your AnimatorController and Animator as well as your Mecanim if you have set/configure these (also a good read: "Locomotion").You can also keep the Animator Window open while you are testing from Unity UI, to see who is the tricky guy doing the "shaking" effect for you, and get one step closer to why it happens.If these don't help, start from scratch: Minimize the code you wrote to move the ball, remove every effect, etc and add them back one by one. Sooner or later "shakieness" will come back (if it persist with the cleanest possible code, see above, Animator/Locomotion issue)
2. Think again not rewriting Unity Physics... You mention for example "...physics engine had a lot of other components like friction and roll that were making the ball's bounces vary...".Now, this is something you can turn off. Completely if you want. Easiest way is to set everything to zero on Physics Material (i.e. friction and bouncieness) but if you want Unity to ignore all and every "actual physics" and let you do what you want with your GameObject, tick in the isKinematic property of the Rigidbody. The fun part of it, you'll still collide if and where you want, can AddForce, etc yet neither gravity nor friction or "anything physical" affect you.If you are not comfy with Unity (and you are not it seems), I highly recommend learning about it a bit first as it is a very good and very powerful engine - so don't throw it's features away as they don't work as you initially expected they'll do. For example, Sebastian Lague just started a great beginner series a few weeks ago. The guy is a teacher, his videos are both short, fun and full of information so I can just recommend his channel.
3. As of your code I would make these changes:
public static class GameConstants { //no monobehaviour == can be a "proper, global" singleton!
public static float GetGravity {
get { return [whatever you want]; }
//why not Physics.gravity, using locally when and where it's needed?
}
//etc, add your methods, properties and such
//use this approach if and only IF you access these values application wide!
//otherwise, instead of a """singleton""" logic you just implemented,
//consider adding an empty GameObject to the Scene, name it "GM" and
//attach a "GameManager" script to it, having all the methods and
//properties you'll need Scene-wide! You can also consider
//using PlayerPrefs (see help link below) instead of a global static
//class, so you save memory (but will need to "reach out" for the data)
}
private void FixedUpdate() { //FIXED update as you'll work with physics!
//float dTime = Time.time - timeSinceBounce; //not needed
//positioning like this is not recommended, use AddForce or set direction and velocity instead
ballPosition.x -= meterOffset / sensitivity;
ballPosition.y = ballInitialPosition.y + GameConstants.Instance.GetBallYVel ()
* Time.fixedDeltaTime - 0.5f * GameConstants.Instance.GetGravity () * Time.fixedDeltaTime * Time.fixedDeltaTime; //Yi+Vy*t-0.5(G)(time^2)
ballPosition.z = (-dTime * GameConstants.Instance.GetBallZVel ()
+ ballInitialPosition.z) * startConstant; //Zi + t*Vz
ball.transform.position = ballPosition;
}BUT to be honest,
I would just throw that code away, implement the Bouncing Ball example Unity Tutorials offer, alter it (see point #2) and work my way up from there.
Items not linked but I mentioned in code:
PlayerPrefs, Physics.gravity and Rigidbody.velocity.
Note that 'velocity' is ignoring parts of physics (speeding up, being "dragged", etc) i.e. objects suddenly start moving with the speed you set (This is why Unity5 recommends AddForce instead -linked above-)
It might also come handy you can alter the FixedUpdate() frequency via Time Management, but I'm not sure this is yet needed (i.e. just for bouncing a ball)
I hope this helps and that ball is going to bounce and jump and dance and everything you want it to do ;)
Cheers!