I am having an issue with linecasting in Unity 2D. What I am trying to do is have a linecast go from the player, through the cursor on screen, and then indefinitely (or for a large time, say times 10). I have made successful attempts at having a Debug.Drawline pass from the player and stop at the location of the mouse. It looks like this:
Do note that the location of my cursor is on the upper left corner of that block. below is the code I use to accomplish this:
mousePos = Camera.main.ScreenToWorldPoint (new Vector2 (Input.mousePosition.x, Input.mousePosition.y));
Debug.DrawLine(new Vector2 (player.transform.position.x, player.transform.position.y+32), new Vector2 (mousePos.x, mousePos.y), Color.green);
Do note that the +32 is used to center the drawline to my characte. However, if I were to multiply the mousePos vector by 2, I get this offset in the drawcast (and also linecast).
Once again my cursor is on the upper left corner of the block. Why is this offset behaving so oddly?
Linecast means from one point to another point. You seem to describe raycast which goes from one point in a direction.
So in your case you'd take the direction from the player to the mouse pointer, normalize that and use infinity as distance.
Don't know exactly what you want to achieve, but as it has already been pointed out I think you should use raycast instead. For example:
var mousePos = Camera.main.ScreenToWorldPoint((Vector2)Input.mousePosition);
var playerPos = (Vector2)player.transform.position;
var direction = (playerPos - mousePos).normalized;
Debug.DrawRay(new Vector2(playerPos.x, playerPos.y + 32), direction, Color.green);
Related
What I want to do is spawn an object in front of the camera and the side I am looking at. When I change the rotation of the camera (looking at a different side), the object is still spawned at the same position. How can I change this (that the Object also changes his angle)?
public void Create(Object myPrefab)
{
Vector3 instantGO = Camera.main.transform.position + new Vector3(0, 0, 7);
Instantiate(myPrefab, instantGO, Quaternion.identity);
}
Use transform.forward - this gives a position relative to the transform e.g. Camera.main.transform.position + (Camera.main.transform.forward * 5) for 5m in front of the cam.
The forward and left properties return a vector of magnitude one, pointing in the direction the transform is facing, or to it's left. You can use -forward and -left to align backwards or to the right. Add this to the position of the object and multiply it to give a position a number of units away. In recent versions of Unity you also have transform... up, down, right etc.
Use this Instantiate variant:
Instantiate(Object original, Vector3 position, Quaternion rotation, Transform parent);
And pass the Camera transform as the parent parameter. This will make the new object a child of the camera and thus always moves/rotates with the camera.
this is my first time posting on here. I'm working on a game using the new Unity multiplayer networking solution.
In summary, the issue is that the player is not moving as intended.
I am trying to take player input as follows:
Vector3 worldSpaceDir = new Vector3(Input.GetAxisRaw("Vertical"), 0, Input.GetAxisRaw("Horizontal"));
then convert it to the object space coordinates of the player character:
_inputDirection = transform.InverseTransformDirection(worldSpaceDir);
The issue I'm having is with a rotation of 0 or 180 the player moves as expected with the WASD inputs, however, at 90 or 270 all the inputs are flipped(A = right, D = left, W = backward, S = forward).
I found a question that is exactly my question but no one responded with an answer. The question is quite old now so I wanted to ask it again for more visibility.
Here's a link to the original question.
Firstly, you are taking the worldSpaceDir wrong, it should be as follow
Vector3 worldSpaceDir = new Vector3(Input.GetAxisRaw("Horizontal"), 0, Input.GetAxisRaw("Vertical"));
here we take horizontal input as X and vertical input as Z, because in Unity Forward is pointed as Z and not Y.
Secondly, we do not need to use InverseTransformDirection() we just need TransformDirection() something like following
Vector3 inputDirection = transform.TransformDirection(worldSpaceDir);
here we are telling unity to convert the worldSpaceDir that is relative to transform (local direction) into a world space direction, so we might actually give a proper name to worldSpaceDir.
The following would work for you.
private void Update() {
Move();
}
private void Move() {
Vector3 directionToMove = new Vector3(Input.GetAxisRaw("Horizontal"), 0, Input.GetAxisRaw("Vertical"));
Vector3 inputDirection = transform.TransformDirection(directionToMove);
transform.position += inputDirection * Time.deltaTime;
}
I think you want to go the other way round actually!
Transform.InverseTransformDirection converts a vector from world space into local space.
What you get as input however is a local vector on the XZ plane. You want to apply this direction according to your player objects orientation, if e.g. pressing right (your input is 1,0,0) the object shall move towards its transform.right vector.
So you rather want to convert in the opposite direction into world space to move the object in the Unity world space.
You should rather be using Transform.TransformDirection!
var worldMove = transform.TransformDirection(input);
Or alternatively you can also just multiply by the rotation like
var worldMove = transform.rotation * input;
Note that if you are also using a Rigidbody like the question you linked there is also Rigidbody.AddRelativeForce which basically works the same way and expects a local space vector which is then internally converted into a world space force.
I was looking to update the ARcamera position.I am doing ImageTracking project.It detects an image and a corresponding prefab is shown in front of the camera.It starts playing an animation.After the animation I want the prefab to come really close towards the camera.When I give the code prefab.position=ARcamera.position; after animation code,I think the prefab goes to the initial position where the ARCamera was when the app had started that is (0,0,0).
How to make the prefab come really close towards the front camera.
speed = 10f;
float step = speed * Time.deltaTime;
Showprefabs.transform.GetChild(0).position = Vector3.MoveTowards(Showprefabs.transform.GetChild(0).position,
new Vector3(Arcam.transform.position.x, Arcam.transform.position.y + 0.2f,
Arcam.transform.position.z + 6.3f), step);
//The values 0.2f and 6.3f I added using the Editor to make the prefab come near the camera(But in world position it is different.)
First of all I hope by "prefab" you mean already Instantiated GameObject. It makes no sense to move a prefab ;)
You tried to calculate the target position but did it with World-Space coordinates.
You probably want to do something like
var targetObject = Showprefabs.transform.GetChild(0);
var currentPosition = targetObject.position;
var targetPosition = Arcam.transform.position
// Place it 60cm in front of the camera
+ Arcam.transform.forward * 0.6f
// additionally move it "up" 20cm perpendicular to the view direction
+ Arcam.transform.up * 0.2f;
targetObject.position = Vector3.MoveTowards(currentPosition, targetPosition, step * Time.deltaTime);
If you want that movement a bit smoother so it moves slower if already close and faster if further away you might be interested in rather using Vector3.Lerp here
public float smoothFactor = 0.5f;
targetObject.position = Vector3.Lerp(currentPosition, targetPosition, smoothFactor);
Where a smoothFactor of 0.5 reads: Every frame set the object to a position in the center of the currentPosition and targetPosition. A value closer to 0 results in slower movement, closer to 1 in faster reaching the targetPosition.
Note that actually this approach will never really fully arrive at the targetPosition but only come very very close but usually this doesn't matter in AR where the Camera constantly moves a bit anyway.
I'm trying to make whack a mole game using project tango.
When user start the game, the program will create holes at random point for the moles to come out. Right now, I already can make the hole and spawn the mole at random, though I have a problem with the created hole.
The hole sometimes spawn at an edge contour of table and stuff and make the hole partially floating in the air. Is there any way to check if the centerPlane is near an edge or not?
Here's the screenshot of the problem I meant. I want the "hole" not to spawn on area that doesn't fit with it's height and width. Currently, I'm using farandole release.
EDIT 1:
I'm trying to do as Hristo suggest. But it doesn't work, the FindClosestPoint always return -1, even when I use the center of the screen. Here's the script I used. And for some additional info, I'm using the unitySDK and unity 5.5.2f1
bool CheckTheCorner(Camera cam,Vector3 planeCenter){
Vector2 firstPointInScreen = WorldToScreenConverter(cam,new Vector3 (planeCenter.x,planeCenter.y,planeCenter.z-holeheight));
Vector2 secondPointInScreen = WorldToScreenConverter(cam,new Vector3 (planeCenter.x,planeCenter.y,planeCenter.z+holeheight));
Vector2 thirdPointInScreen = WorldToScreenConverter(cam,new Vector3 (planeCenter.x-holewidth,planeCenter.y,planeCenter.z));
Vector2 fourthPointInScreen = WorldToScreenConverter(cam,new Vector3 (planeCenter.x+holewidth,planeCenter.y,planeCenter.z));
DebugText.text = m_pointCloud.FindClosestPoint (cam, new Vector2(Screen.width / 2, Screen.height / 2), 1).ToString ();
Vector3 firstPoint = m_pointCloud.m_points[m_pointCloud.FindClosestPoint(cam, firstPointInScreen, 1)];
Vector3 secondPoint = m_pointCloud.m_points[m_pointCloud.FindClosestPoint(cam, secondPointInScreen, 1)];
Vector3 thirdPoint = m_pointCloud.m_points[m_pointCloud.FindClosestPoint(cam, thirdPointInScreen, 1)];
Vector3 fourthPoint = m_pointCloud.m_points[m_pointCloud.FindClosestPoint(cam, fourthPointInScreen, 1)];
return false;
}
Vector2 WorldToScreenConverter(Camera cam,Vector3 worldPos){
Vector3 screenPos = cam.WorldToScreenPoint (worldPos);
return new Vector2 (screenPos.x,screenPos.z);
}
Ah yes, don't mind the return false one for the moment, I just put it there to avoid error since I'm still figuring out the FindClosestPoint.
What you can do is take the 4 corners on your plane and decide if they are all laying on a surface in the real world, if not you can make the plane elsewhere.
That can happen with the use of FindClosestPoint() method in the TangoPointCloud.cs. What that method does is makes a Raycast from your camera trough a certain point on the screen landing in the real world environment. The method then returns the index of that point. The list to search with the indexes is called m_points
So lets split it in steps:
Make 4 Vectors using the `FindClosestPoint().
Check if all 4 vectors are on the same plane (simple math).
If step 2 is true -> Instantiate your GameObject on that plane.
To get one of the vectors your code should be something like this:
Vector3 firstPoint = m_pointCloud.m_points[m_pointCloud.FindClosestPoint(Camera.main, new Vector2(Screen.width / 2, Screen.height / 2), 1)];
In this example I'm using the center of the screen as my Vector2 parameter. However you don't want the center of the screen . Instead you want the position of one corner from your plane translated as a screen point.
Hope that solves your problem. Cheers.
I have an object that rotates according to mouse position, but I want to clamp it so it doesn't get further or lower than certain value. Here is my code:
void LookAt () {
float distance = transform.position.z - Camera.main.transform.position.z;
Vector3 position = new Vector3(Input.mousePosition.x, Input.mousePosition.y, distance);
position = Camera.main.ScreenToWorldPoint(position);
position.x = Mathf.Clamp(position.x, -70, 70);
position.z = Mathf.Clamp(position.z, -70, 70);
Vector3 target = new Vector3 (position.x, transform.position.y, position.z); // Use current object positin.y
transform.LookAt(target);
}
But unfortunately it doesn't work, it keeps rotating 360.
Edit:
This is a 3D top-down game, I have a tank and I want to rotate it's upper half. The code I wrote above works perfect for the job, but now I don't know how to limit it so the barrel( the part I'm rotating) always facing upwards where the enemies will come from. 70 or whatever are just random values I was testing, first I want to figure what exactly the proper code is, then determining the values is the easy part.
Actually, the problem is that you're clamping a position, not a rotation. You're having it look at a certain point, but limiting that point rather than the angle that it will need to rotate to meet it. You'll have to use trigonometry to calculate the angle it wants to point in (more specifically, the atan2 function), clamp that value to (-70, 70), and then apply that rotation to the object (using euler angles). Do you require further clarification on any of these steps?
Cheers.
P.S. Note that atan2 returns a value in radians, but your range and euler angles use degrees.
You limit your target position by 70 units in world space, which is usually a lot, but depends on your game scale. What I think you wanted to do is to limit mouse position by 70 pixels around the screen center. (Please, provide this remarks in the question itself, so we won't have to guess). However, because you used the same variable both for screen space and world space position of the target, you likely got confused and clamped the position after converting it to world space.
Also, you made the y coordinate of the target to be the same as the object. But this means that the object would have to rotate 360 degrees every time the target passed it. I assume that what you wanted to do instead is to assume that the target location is located on camera place.
void LookAt () {
var cursorPosition = new Vector3(Input.mousePosition.x, Input.mousePosition.y, camera.main.nearClipPlane);
cursorPosition.x = Mathf.Clamp(position.x, -70, 70);
cursorPosition.z = Mathf.Clamp(position.z, -70, 70);
var targetPosition = Camera.main.ScreenToWorldPoint(cursorPosition);
transform.LookAt(targetPosition);
}
Please, provide details about your reasoning and desired behavior when you ask to find errors in your code.