What is the best way to draw a graph for the HoloLens in unity?
I am new to this platform and have no idea which packages will work and which dont, the graph gets data dynamically.
EDIT: I have tried LineRenderer but it seems very limited in version 5.4 of Unity
A possible Solution for drawing a 3D-Graph is using a particle system:
Simple Example for a Component Script for a particle system:
public class Graph: MonoBehaviour {
//Particle-Resolution of the Graph
[Range(10, 100)]
public int resolution = 10;
private int currentResolution;
private ParticleSystem.Particle[] points;
void Start()
{
currentResolution = resolution;
points = new ParticleSystem.Particle[resolution];
float increment = 1f / (resolution - 1);
for (int i = 0; i < resolution; i++)
{
float x = i * increment;
points[i].position = new Vector3(x, 0f, 0f);
points[i].startColor = new Color(0f, 0f, 0f);
points[i].startSize = 0.1f;
}
}
void Update()
{
if ((currentResolution != resolution) || (points == null))
{
CreatePoints();
}
FunctionDelegate f = functionDelegates[(int)function];
for (int i = 0; i < points.Length; i++)
{
Vector3 p = points[i].position;
p.y = Sine(p.x);
points[i].position = p;
Color c = points[i].GetCurrentColor(GetComponent<ParticleSystem>());
c.g = p.y;
c.r = 1f - p.y;
points[i].startColor = c;
}
GetComponent<ParticleSystem>().SetParticles(points, points.Length);
}
private static float Sine(float x)
{
return 0.5f + 0.5f * Mathf.Sin(2 * Mathf.PI * x + Time.timeSinceLevelLoad);
}
}
A good tutorial for drawing 2D/3D graphs (including this example) with a particle system from CatLikeCoding (Jasper Flick). Refer to: http://catlikecoding.com/unity/tutorials/graphs/. It's a bit outdated and you must use startSize/startColor instead the depreceated color/size-Properties in this case.
But i'have testet it with the hololens allready and it worked fine. Some experiments with the HoloToolkit shaders for a better performance are necessary if you have a big amount of particles :-)
If you have further questions: Just ask me.
Related
I don't understand the usage of method Physics.OverlapBox.
I want to put ten walls on a 4x4 plane in my scene. The width and location of the walls is calculated randomly. In the odd number of cycles in the creation loop the wall is rotated 90 degrees.
The walls presented in the scene should not collide with other walls... but it's not working.
void Reset()
{
int walls = 10;
for (int w = 0; w < walls; w++)
{
for (int i = 0; i < 5; i++)
{
float x = Random.Range(-20f, 20f);
float z = Random.Range(-20f, 20f);
Vector3 center = new Vector3(x, 1.51f, z);
int scalex = Random.Range(4, 13);
Quaternion quaternion = Quaternion.identity;
if (w % 2 == 1)
quaternion=Quaternion.Euler(0, 0, 0);
else
quaternion=Quaternion.Euler(0, 90, 0);
Collider[] colliders = Physics.OverlapBox(center, new Vector3(scalex, 3, 1) / 2, quaternion);
Debug.Log(colliders.Length);
if (colliders.Length == 0)
{
GameObject wall = GameObject.CreatePrimitive(PrimitiveType.Cube);
wall.transform.position = center;
wall.transform.localScale = new Vector3(scalex, 3, 1);
wall.transform.rotation = quaternion;
wall.tag = "wall";
break;
}
}
}
}
After your comment I think I now know what the issue is:
The physics engine simply doesn't "know" your walls colliders yet since the physics engine is updated in the next FixedUpdate.
You might want to call Physics.Simulate after each wall in order to manually trigger a physics update.
The docs are a bit unclear if it is necessary but you might have to disable Physics.autoSimulation before the loop and turn it back on after you are finished with the wall creation.
The solution proposed by derHugo (a lot of thanks) works from Start method. I added rotation to the walls. No collisions.
The code:
public void Start()
{
Physics.autoSimulation = false;
for (int i = 0; i < 200; i++)
{
createWall();
Physics.Simulate(Time.fixedDeltaTime);
}
Physics.autoSimulation = true;
}
void createWall()
{
float x = Random.Range(-20f, 20f);
float z = Random.Range(-20f, 20f);
Vector3 position = new Vector3(x, 1.51f, z);
Quaternion rotation = Quaternion.Euler(0, Random.Range(0,360), 0);
int scalex = Random.Range(2, 5);
Collider[] colliders = Physics.OverlapBox(position, new Vector3(scalex, 1, 1)/2, rotation);
if (colliders.Length==0)
{
GameObject wall = GameObject.CreatePrimitive(PrimitiveType.Cube);
wall.transform.localPosition = position;
wall.transform.localScale = new Vector3(scalex, 3, 1);
wall.transform.rotation = rotation;
wall.tag = "wall";
}
}
Good day
I am trying to restrict my camera movement using a function that I am using to restrict other elements in a 2D game. When I call this function using my camera, it does something strange.
For some reason it does not display anything as soon as I called the function. I have tested the camera's position using Debug.log, and it seems to be in exactly the same place. The constraints also seem to work, but that is useless if nothing displays.
I am using a Mathf.Clamp function to try and constrain the map. I know that there are many tutorials showing how to constrain map movement, and honestly my approach seems similar.
I want to know why this function is failing. I am trying to keep things generic, and am already using this function to restrict the movement of other game elements.
My code looks like this:
int cameraSpeed = 10;
GameObject camera;
int maxX = 20;
int minX = -20;
int maxY = 20;
int minY = -20;
// Use this for initialization
public void constrain(GameObject obj)
{
Vector2 pos = obj.transform.position;
pos.x = Mathf.Clamp(pos.x, -maxX, maxX);
pos.y = Mathf.Clamp(pos.y, -maxY, maxY);
obj.transform.position = pos;
}
void Start () {
camera = GameObject.Find("Main Camera");
}
// Update is called once per frame
void Update()
{
if (Input.GetKey(KeyCode.RightArrow))
{
camera.transform.Translate(new Vector2(cameraSpeed * Time.deltaTime, 0));
}
if (Input.GetKey(KeyCode.LeftArrow))
{
camera.transform.Translate(new Vector2(-cameraSpeed * Time.deltaTime, 0));
}
if (Input.GetKey(KeyCode.DownArrow))
{
camera.transform.Translate(new Vector2(0, -cameraSpeed * Time.deltaTime));
}
if (Input.GetKey(KeyCode.UpArrow))
{
camera.transform.Translate(new Vector2(0, cameraSpeed * Time.deltaTime));
}
Debug.Log(camera.transform.position.x);
Debug.Log(camera.transform.position.y);
constrain(camera);
}
Screenshot of game without constraints:
Screenshot of game with constraints:
I am new to Unity and am trying to understand it thoroughly. Any advice would be greatly appropriated.
The Z-position of your camera is being set to 0. All of your other objects have the same Z-position, so the camera won't render them.
Change constrain() to:
public float zPos = -10
public void constrain(GameObject obj)
{
Vector3 pos = obj.transform.position;
pos.x = Mathf.Clamp(pos.x, -maxX, maxX);
pos.y = Mathf.Clamp(pos.y, -maxY, maxY);
pos.z = zPos
obj.transform.position = pos;
}
and that should fix it.
EDIT: The reason that this is happening is because you were using a Vector2 for your camera position. In Unity, a Vector2 is a Vector3 with a z-value of 0.
I have managed to find the bug with #DerwB's assistance. I now see that the camera needs to be on a lower z index than the objects it is displaying. DerwB's answer is close to a solution, but it does not allow the function to be reused to constrain other objects.
I have thus modified the function as below:
public void constrain(GameObject obj, bool isCamera = false)
{
Vector3 pos = obj.transform.position;
pos.x = Mathf.Clamp(pos.x, -maxX, maxX);
pos.y = Mathf.Clamp(pos.y, -maxY, maxY);
if(isCamera)
pos.z = 0;
else
pos.z = 1;
obj.transform.position = pos;
}
You then call the function as follows for the camera:
GameObject camera = GameObject.Find("Main Camera");
constrain(camera.gameObject,true); //if you are constraining the camera object
And like this if you are referencing other game objects:
GameObject player= GameObject.Find("Player");
constrain(player.gameObject,true); //skip the optional parameter if not referencing the camera
Problem :
I want to make prototype for cleaning windows (I mean cleaning dirty windows) in unity.
I was searching about this subject and finding that I can change pixel by Texture2D.SetPixel().
I try to do it by this method, First I enabled read/write of texture and try this method but nothing happened on my sprite.
So I want to ask it if it's possible to change alpha of the sprite that is clicked by mouse or touched to show the below sprite of original one !?
My Code :
private RaycastHit2D hitInfo;
private SpriteRenderer spriteRendererComponent;
private Color zeroAlpha;
// Use this for initialization
void Start ()
{
spriteRendererComponent = transform.GetComponent<SpriteRenderer>();
zeroAlpha = Color.blue;
}
// Update is called once per frame
void Update () {
if (Input.GetMouseButton(0))
{
MouseClick();
}
}
public void MouseClick()
{
Vector2 mousePosition = Vector2.zero;
mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
hitInfo = Physics2D.Raycast(mousePosition, Vector2.zero);
if (hitInfo)
{
spriteRendererComponent.sprite.texture.SetPixel((int)hitInfo.point.x, (int)hitInfo.point.y, zeroAlpha);
spriteRendererComponent.sprite.texture.Apply();
}
}
Answer :
You can use this thread for Optimizing of changing pixels of sprite
I've found answer about changing pixels of sprite (Painting)
public float radius;
public Color InitialColor;
private RaycastHit2D hitInfo;
// Use this for initialization
void Start()
{
}
// Update is called once per frame
void Update()
{
if (CustomInput.ControlStay())
{
hitInfo = CustomInput.ClickednTouched().hitInfo;
if (hitInfo)
{
UpdateTexture();
}
}
}
public Texture2D CopyTexture2D(Texture2D copiedTexture2D)
{
float differenceX;
float differenceY;
//Create a new Texture2D, which will be the copy
Texture2D texture = new Texture2D(copiedTexture2D.width, copiedTexture2D.height);
//Choose your filtermode and wrapmode
texture.filterMode = FilterMode.Bilinear;
texture.wrapMode = TextureWrapMode.Clamp;
//Center of hit point circle
int m1 = (int)((hitInfo.point.x + 2.5f) / 5 * copiedTexture2D.width);
int m2 = (int)((hitInfo.point.y + 2.5f) / 5 * copiedTexture2D.height);
for (int x = 0; x < texture.width; x++)
{
for (int y = 0; y < texture.height; y++)
{
differenceX = x - m1;
differenceY = y - m2;
//INSERT YOUR LOGIC HERE
if (differenceX * differenceX + differenceY * differenceY <= radius * radius)
{
//This line of code and if statement, turn all texture pixels within radius to zero alpha
texture.SetPixel(x, y, InitialColor);
}
else
{
//This line of code is REQUIRED. Do NOT delete it. This is what copies the image as it was, without any change
texture.SetPixel(x, y, copiedTexture2D.GetPixel(x, y));
}
}
}
//This finalizes it. If you want to edit it still, do it before you finish with Apply(). Do NOT expect to edit the image after you have applied.
texture.Apply();
return texture;
}
public void UpdateTexture()
{
SpriteRenderer mySpriteRenderer = gameObject.GetComponent<SpriteRenderer>();
Texture2D newTexture2D = CopyTexture2D(mySpriteRenderer.sprite.texture);
//Get the name of the old sprite
string tempName = mySpriteRenderer.sprite.name;
//Create a new sprite
mySpriteRenderer.sprite = Sprite.Create(newTexture2D, mySpriteRenderer.sprite.rect, new Vector2(0.5f, 0.5f));
//Name the sprite, the old name
mySpriteRenderer.sprite.name = tempName;
//Update the material
//If you have multiple sprites, you will want to do this in a loop
//mySpriteRenderer.material.mainTexture = newTexture2D;
//mySpriteRenderer.material.shader = Shader.Find("Unlit/Transparent");
}
Another problem :
Finding pixel on sprite :
In Unity3d we have RaycastHit.textureCoord but it doesn't exist anymore in 2D. I was searching about this problem, a lot but I didn't find anything useful.
So I want to know the solution for this problem and I'm wondering why method like textureCoord in 3D doesn't exist in 2D.
Answer :
I've found answer again as you see in the previous code for finding pixel on sprite.
Thread : Finding pixel on sprite in Unity
Check this out!
I have fixed your script. Works on different texture sizes. Different texture places and camera size. Require box collider 2d.
using UnityEngine;
using System.Collections;
public class ExampleClass : MonoBehaviour
{
public float radius;
public Color InitialColor;
private RaycastHit2D hitInfo;
// Update is called once per frame
void Update()
{
if (Input.GetMouseButton(0))
{
hitInfo = Physics2D.Raycast(Camera.main.ScreenToWorldPoint(Input.mousePosition), Vector2.zero);
if (hitInfo)
{
UpdateTexture();
}
}
if (Input.GetMouseButtonUp(0))
{
Resources.UnloadUnusedAssets();
}
}
public Texture2D CopyTexture2D(Texture2D copiedTexture2D)
{
float differenceX;
float differenceY;
//Create a new Texture2D, which will be the copy
Texture2D texture = new Texture2D(copiedTexture2D.width, copiedTexture2D.height);
//Choose your filtermode and wrapmode
texture.filterMode = FilterMode.Bilinear;
texture.wrapMode = TextureWrapMode.Clamp;
//Center of hit point circle
int m1 = (int)((hitInfo.point.x - hitInfo.collider.bounds.min.x) * (copiedTexture2D.width / hitInfo.collider.bounds.size.x));
int m2 = (int)((hitInfo.point.y - hitInfo.collider.bounds.min.y) * (copiedTexture2D.height / hitInfo.collider.bounds.size.y));
//Vector2 extremeScreenPoint = Camera.main.ScreenToWorldPoint(new Vector2(0, 0));
//Debug.Log("extremeScreenPoint= " + extremeScreenPoint.x
// + " hitInfo.point.x =" + hitInfo.point.x
// //+ " mousePosition =" + Camera.main.ScreenToWorldPoint(Input.mousePosition).x
// + " bounds.min =" + hitInfo.collider.bounds.min .x
// + " bounds.max =" + hitInfo.collider.bounds.max .x
// + " size =" + hitInfo.collider.bounds.size.x
// + " hit =" + (hitInfo.point.x - hitInfo.collider.bounds.min.x)
// + " pixels =" + (hitInfo.point.x - hitInfo.collider.bounds.min.x) * (copiedTexture2D.width / hitInfo.collider.bounds.size.x)
// );
for (int x = 0; x < texture.width; x++)
{
for (int y = 0; y < texture.height; y++)
{
differenceX = x - m1;
differenceY = y - m2;
//INSERT YOUR LOGIC HERE
if (differenceX * differenceX + differenceY * differenceY <= radius * radius)
{
//This line of code and if statement, turn all texture pixels within radius to zero alpha
texture.SetPixel(x, y, InitialColor);
}
else
{
//This line of code is REQUIRED. Do NOT delete it. This is what copies the image as it was, without any change
texture.SetPixel(x, y, copiedTexture2D.GetPixel(x, y));
}
}
}
//This finalizes it. If you want to edit it still, do it before you finish with Apply(). Do NOT expect to edit the image after you have applied.
texture.Apply();
//DestroyImmediate(copiedTexture2D, true);
return texture;
}
public void UpdateTexture()
{
SpriteRenderer mySpriteRenderer = gameObject.GetComponent<SpriteRenderer>();
Texture2D newTexture2D = CopyTexture2D(mySpriteRenderer.sprite.texture);
//Get the name of the old sprite
string tempName = mySpriteRenderer.sprite.name;
//Create a new sprite
mySpriteRenderer.sprite = Sprite.Create(newTexture2D, mySpriteRenderer.sprite.rect, new Vector2(0.5f, 0.5f));
//Name the sprite, the old name
mySpriteRenderer.sprite.name = tempName;
//Update the material
//If you have multiple sprites, you will want to do this in a loop
//mySpriteRenderer.material.mainTexture = newTexture2D;
//mySpriteRenderer.material.shader = Shader.Find("Unlit/Transparent");
}
}
I worked with Writing and Reading a Texture once (for a scratching card).
You have to consider that when you change the Pixels of the Sprite, you are changing the pixels for the entire texture. So let's say that i change the pixel 1x1, most likely it will not change the pixel 1x1 in my sprite if i have a bunch of sprites in the same texture. So you have to consider the offsets of the sprite and reposition the pixel that you want to change.
Try to do something like this:
public void MouseClick()
{
Vector2 offset = new Vector2(XXX, YYY);
Vector2 mousePosition = Vector2.zero;
mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
hitInfo = Physics2D.Raycast(mousePosition, Vector2.zero);
if (hitInfo)
{
spriteRendererComponent.sprite.texture.SetPixel((int)hitInfo.point.x + offset.x, (int)hitInfo.point.y + offset.y, zeroAlpha);
spriteRendererComponent.sprite.texture.Apply();
}
}
How I can set particle emitting mesh in "Particle System"(Shuriken) component? Searching in google returns me tutorials only for legacy particle system.
UPD: #gamedevelopmentgerm answered to my question:
If you want to control all aspects of particle system in runtime then you must use legacy particles.
...
UP1. Oh, I see the comment below. No, you can't change mesh shape from script though once I have seen a workaround for this problem. It was something about setting up an empty mesh as ParticleSystem emission shape an then change the mesh geometry from script.
UP2. Ok, I see further details. If you want to simulate fire propagation then I recommend you to consider ParticleSystem.Emit method instead of any emission shape whatsoever. I recommend it because with ParticleSystem.Emit you will be able to control emission shape in much more flexible way.
In fact, you may use ParticleSystem.Emit to emit particles from different mesh instances as well.
using UnityEngine;
using System.Collections;
[RequireComponent( typeof( ParticleSystem ) )]
public class CustomParticleSystem : MonoBehaviour
{
#region Properties
public Mesh[] EmissionShapes;
public float EmissionShapeSwitchSpeed = 0.5f;
public float EmissionRate = 10f;
#endregion
float _shapeIndex = 0f;
float _timeToEmission = 0f;
ParticleSystem _particleSystem;
float EmissionPeriod { get { return 1f / EmissionRate; } }
void Awake ()
{
_particleSystem = GetComponent<ParticleSystem>();
_particleSystem.emissionRate = 0f;
_timeToEmission = EmissionPeriod;
}
void Start ()
{
}
void Update ()
{
_shapeIndex += EmissionShapeSwitchSpeed * Time.deltaTime;
if( _shapeIndex > EmissionShapes.Length-1 ) _shapeIndex -= (EmissionShapes.Length-1);
_timeToEmission -= Time.deltaTime;
if( _timeToEmission <= 0f )
{
_timeToEmission = EmissionPeriod - _timeToEmission;
Mesh currentShape = EmissionShapes[(int)_shapeIndex];
int triangleIndex = Random.Range( 0, currentShape.triangles.Length/3 );
int vertexIndex0 = currentShape.triangles[triangleIndex*3];
int vertexIndex1 = currentShape.triangles[triangleIndex*3+1];
int vertexIndex2 = currentShape.triangles[triangleIndex*3+2];
Vector3 v0 = currentShape.vertices[vertexIndex0];
Vector3 v1 = currentShape.vertices[vertexIndex1];
Vector3 v2 = currentShape.vertices[vertexIndex2];
Vector3 n0 = currentShape.normals[vertexIndex0];
Vector3 n1 = currentShape.normals[vertexIndex1];
Vector3 n2 = currentShape.normals[vertexIndex2];
float u = Random.Range( 0f, 1f );
float v = Random.Range( 0f, 1f );
float w = Random.Range( 0f, 1f );
float uvw = u+v+w;
u /= uvw;
v /= uvw;
w /= uvw;
Vector3 randomPosition = v0*u + v1*v + v2*w;
Vector3 normalAtRandomPosition = n0*u + n1*v + n2*w;
randomPosition = this.transform.localToWorldMatrix.MultiplyPoint( randomPosition );
normalAtRandomPosition = this.transform.localToWorldMatrix.MultiplyVector( normalAtRandomPosition );
_particleSystem.Emit(
randomPosition,
normalAtRandomPosition * _particleSystem.startSpeed,
_particleSystem.startSize,
_particleSystem.startLifetime,
_particleSystem.startColor
);
}
}
}
(Using unity3d 4.3 2d, it uses box2d like physics).
I have problems with predicting trajectory
I'm using:
Vector2 startPos;
float power = 10.0f;
float interval = 1/30.0f;
GameObject[] ind;
void Start (){
transform.rigidbody2D.isKinematic = true;
ind = new GameObject[dots];
for(int i = 0; i<dots; i++){
GameObject dot = (GameObject)Instantiate(Dot);
dot.renderer.enabled = false;
ind[i] = dot;
}
}
void Update (){
if(shot) return;
if(Input.GetAxis("Fire1") == 1){
if(!aiming){
aiming = true;
startPos = Input.mousePosition;
ShowPath();
}
else{
CalculatePath();
}
}
else if(aiming && !shot){
transform.rigidbody2D.isKinematic = false;
transform.rigidbody2D.AddForce(GetForce(Input.mous ePosition));
shot = true;
aiming = false;
HidePath();
}
}
Vector2 GetForce(Vector3 mouse){
return (new Vector2(startPos.x, startPos.y)- new Vector2(mouse.x, mouse.y))*power;
}
void CalculatePath(){
ind[0].transform.position = transform.position; //set frist dot to ball position
Vector2 vel = GetForce(Input.mousePosition); //get velocity
for(int i = 1; i < dots; i++){
ind[i].renderer.enabled = true; //make them visible
Vector3 point = PathPoint(transform.position, vel, i); //get position of the dot
point.z = -1.0f;
ind[i].transform.position = point;
}
}
Vector2 PathPoint(Vector2 startP, Vector2 startVel, int n){
//Standard formula for trajectory prediction
float t = interval;
Vector2 stepVelocity = t*startVel;
Vector2 StepGravity = t*t*Physics.gravity;
Vector2 whattoreturn = ((startP + (n * stepVelocity)+(n*n+n)*StepGravity) * 0.5f);
return whattoreturn;
}
Using this, I get wrong trajectory.
1. It's like gravity doesn't drag trajectory down at all, and yes i know that gravity is weak because:
t*t*Physics.gravity = 0.03^2 * vector2(0, -9.8) = vector2(0, -0.00882)
But that is the formula :S
2. Since gravity is low, velocity is too strong.
Here is the video:
http://tinypic.com/player.php?v=1z50w3m&s=5
Trajectory formula form:
http://www.iforce2d.net/b2dtut/projected-trajectory
What should I do?
I found that if I set
StepGravity to something stronger like (0, -0.1)
and devide startVel by 8
I get nearly right trajectory, but i don't want that, I need true trajectory path.
Users from answer.unity3d.com said I should ask here, because here is a bigger group of mathematical coders.
And I searched a lot about this problem (that how I found that formula).
you're only calculating the effect of gravity over 1/30th of a second for each step - you need to do it cumulatively. Step 1 should end with a velocity of 0.09G, Step 2 with .18G, step3 with .27G etc.
Here's a very simple example that draws the ballistic trajectory based on start velocity and a supplied time:
using UnityEngine;
using System.Collections;
public class grav : MonoBehaviour {
public Vector3 StartVelocity;
public float PredictionTime;
private Vector3 G;
void OnDrawGizmos()
{
if (G == Vector3.zero)
{
// a hacky way of making sure this gets initialized in editor too...
// this assumes 60 samples / sec
G = new Vector3(0,-9.8f,0) / 360f;
}
Vector3 momentum = StartVelocity;
Vector3 pos = gameObject.transform.position;
Vector3 last = gameObject.transform.position;
for (int i = 0; i < (int) (PredictionTime * 60); i++)
{
momentum += G;
pos += momentum;
Gizmos.DrawLine(last, pos);
last = pos;
}
}
}
In you version you'd want draw your dots where I'm drawing the Gizmo, but it's the same idea unless I'm misunderstanding your problem.