How To Draw The Number 2 In 3d

The unity line renderer, helps you render lines, circles, and other shapes using curves. Also as some coordinate points in unity so that yous can create any sort of curves. You can draw color lines in 2d to help you with raycasts or simply describe laser beams between two points or objects.

This will be rendered on run time using a line renderer component in unity. Line renderers are useful for drawing paths in your games.

For instance a application of line renderers are in the famous game Angry Birds.

Where a path is drawn by dragging on a mobile screen.

Line renderer tin can too help in targetting systems where you want to draw a raycast of where a bullet might shoot to in a first person game.

The unity line renderer component can besides be used in building bones drawing apps using the unity engine.

All these applications brand line renderers a actually of import thing to larn in unity.

In this tutorial I will be going over a few principles. Drawing a unity line renderer between a mouse / screen tap, dragging it and drawing it on your scene.

We volition besides look at drawing a line renderer betwixt ii game objects.

Dotted lines is also something people are quite interested in and I will await at how we can depict a unity 2d line renderer which can give usa a dotted line.

Let'south become started on this unity 2d line renderer tutorial, so to beginning I'k going to create a basic unity project which we can experiment with.

Creating our unity 2d line renderer project

Start off by opening unity hub. Create a new second project called unity 2d line renderer. Like below:

With a new bare projection. Nosotros want to start past just setting up some basic game objects. So that we can just go to the part of simply drawing a basic line renderer.

Create a empty game object. Right click in the hierarchy and create a empty game object like below.

Next create a new c# script and call it unity line renderer test. Similar below.

Creating a bones unity add line renderer by script using c#

Let u.s.a. a construct a basic line renderer script.

                      LineRenderer l = gameObject.AddComponent<LineRenderer>();                  Listing<Vector3> pos = new List<Vector3>();         pos.Add(new Vector3(0, 0));         pos.Add(new Vector3(10, x));         l.startWidth = 1f;         l.endWidth = 1f;         l.SetPositions(pos.ToArray());         50.useWorldSpace = true;

This code will produce a line like this.

Let'south at present endeavor exercise something a piffling more complicated. Let'due south create a triangle with the renderer.

To do this we need the start width to be 0 and the end width to exist a larger number. Also allow'southward change our positions.

LineRenderer l = gameObject.AddComponent();

                      List<Vector3> pos = new List<Vector3>();     pos.Add(new Vector3(0, 5));     pos.Add(new Vector3(0, -x));     fifty.startWidth = 0f;     fifty.endWidth = 15f;     l.SetPositions(pos.ToArray());     l.useWorldSpace = true;

So permit's just walk through this lawmaking quick. So we create two positions nosotros too create start and cease widths.

Where the bespeak which makes the meridian of the triangle being a width of but 0 and the bottom portion being xv.

Allow's brand a square line renderer.

This should be like to the triangle shape. Except we will make our 0 width fifteen to match the bottom. So here is the lawmaking.

                      LineRenderer fifty = gameObject.AddComponent<LineRenderer>();                  List<Vector3> pos = new List<Vector3>();         pos.Add(new Vector3(0, 5));         pos.Add together(new Vector3(0, -x));         50.startWidth = 15f;         fifty.endWidth = 15f;         fifty.SetPositions(pos.ToArray());         l.useWorldSpace = true;

Let'south at present expect at how we can do something somewhat more avant-garde permit united states of america attempt create a circumvolve. For this we going to utilize a few basic mathematics functions to use pi and draw points.

                      for (int i = 0; i < pointcounter; i++)         {             var radian = Mathf.Deg2Rad * (i * 360f / segments);             points[i] = new Vector3(Mathf.Sin(radian) * radius, Mathf.Cos(radian) * radius,0);         }

So as yous tin can encounter you can create a whole lot of dissimilar shapes using a line renderer. This tin can give you a lot of freedom to generate these shapes on the fly at run time in your games.

Allow us now expect at how we can color our line renderer.

Unity line renderer color changes

For demonstrating color in our renderer we will go back to using a our square shape.

Let'due south create one solid color for our line to practice that add these 2 lines to your code.

                      l.startColor = Color.carmine;   fifty.endColor = Colour.red;

You demand to then hit run on your project. You will become this pink for at present. I will bear witness y'all how to fix it.

To fix this you need to caput over to the right while running your project.

Click on that piffling circumvolve icon and assign a material.

You should now have this where you color is correct.

Allow'south create a gradient for our line renderer.

Alter your lawmaking to accept these colors.

                      l.startColor = Color.reddish;     l.endColor = Color.white;

Follow the same steps from before and yous should now go a foursquare that looks like this.

This is at present all good and well if we merely demand two colors. Allow's look at using a multiple color gradient.

Change your code to use this instead.

          Gradient thou = new Slope();          float alpha = 1.0f;          g.SetKeys(             new GradientColorKey[] { new GradientColorKey(Color.green, 0.0f), new GradientColorKey(Color.red, 0.5f), new GradientColorKey(Color.blue, ane.0f) },             new GradientAlphaKey[] { new GradientAlphaKey(alpha,0.0f), new GradientAlphaKey(alpha, 0.5f), new GradientAlphaKey(alpha, 1.0f) }         );         fifty.colorGradient = g;

So how this code works is we commencement ascertain a new gradient object. We have a alpha of 1.0 and so nosotros have full opacity. Then we need to add gradient color keys for each color we want in our gradient.

So our gradient primal has two values, one is the colour the other is a time value.

The time value determines how far our gradient will stretch here are two examples of what the above code would await similar vs the same code with different time values.

unity line renderer multiple color gradient

The code that produces the above is this gradient color keys.

          new GradientColorKey(Colour.green, 0.0f), new GradientColorKey(Color.cerise, 0.2f), new GradientColorKey(Colour.blue, 1.0f)

And then as y'all can see the modify to 0.2f on the red calibration makes our dark-green function of our gradient shorter, because our green is from 0 to 0.2f.

I call up we have now covered a lot on gradients with line renderers and ways to color your line renderer.

As well if you lot wanted to suit transparency of your line renderer you would be able to do it by changing that alpha value.

Allow'due south at present look how we can draw a line renderer between two game objects.

Unity line renderer between two gameobjects

For this section of the tutorial we want to get and create two cubes. We will then create a line renderer which volition describe between these two game objects. So go ahead in your project and right click in your hierarchy and create ii cubes.

Once done click on this second button to switch into 3d view.

Then motion your cubes so they are somewhat apart in your scene like the below screenshot.

Let us as well add a directional low-cal so that our scene is more lit upwardly.

You should now have something like this.

unity line renderer two gameobjects light - draw line between points

Finally to become our camera into 3d view we demand to click on our main camera and modify this settings.

To make your camera marshal to your view yous need to click on align to view in the menu like this.

So if yous hit play on your scene you will now cease upwards with your two cubes in your scene in 3d perspective view.

Let us at present modify our code so we tin can draw between 2 game objects.

          using System.Collections; using System.Collections.Generic; using UnityEngine;  public class UnityLineRendererTest : MonoBehaviour {     // Start is called earlier the first frame update     public GameObject go1;     public GameObject go2;     void Start()     {         LineRenderer l = gameObject.AddComponent<LineRenderer>();          List<Vector3> pos = new List<Vector3>();         pos.Add(go1.transform.position);         pos.Add together(go2.transform.position);         50.startWidth = 0.1f;         50.endWidth = 0.1f;         50.SetPositions(pos.ToArray());         fifty.useWorldSpace = true;       }     }

Once y'all take updated your code to this. Go ahead and drag your two cubes into the game object slots like this.

unity line renderer 3d draw between two game objects cubes

You should now end upwards with something like this.

line renderer between two 3d game objects

Allow's motion our lawmaking into our update method now so we tin can see how we can morph our line renderer by moving our cubes around the scene. And then update your code to this.

          using Organization.Collections; using System.Collections.Generic; using UnityEngine;  public class UnityLineRendererTest : MonoBehaviour {     // Get-go is called before the kickoff frame update     public GameObject go1;     public GameObject go2;     LineRenderer l;     void Start()     {         l = gameObject.AddComponent<LineRenderer>();      }        // Update is called once per frame     void Update()     {         Listing<Vector3> pos = new List<Vector3>();         pos.Add together(go1.transform.position);         pos.Add(go2.transform.position);         l.startWidth = 0.1f;         l.endWidth = 0.1f;         l.SetPositions(pos.ToArray());         l.useWorldSpace = truthful;     } }

You should now be able to do this when you run your project.

That pretty much sums up how yous can depict a line renderer between ii objects in unity as well as motility it around and change information technology.

Unity line renderer performance

Allow's talk nearly performance. Line renderers generally doesn't have a very high performance cost, but make sure to not over use them.

Besides when using them make certain to have a skillful clean up strategy or pooling or re utilize strategy so that yous don't keep creating new renderers.

Using best practices for cleaning up objects is always advise in unity. So make certain to write sound code which volition help you lot clean upward after yourself.

We have now washed some line renderers between ii points, between two gameobjects, nosotros have looked at unlike shapes and line renderer coloring.

Let'southward look at something a little more than advanced. Allow us try and render a curve.

Oft asked questions

What is line renderer in unity?

A line renderer in unity is a object which allows yous to draw lines. Using multiple points, so with a line renderer you can draw any blazon of object if yous provide enough points to construct it. Line renderers are useful for trails for aiming.

How do yous draw a line in unity?

Yous more often than not would employ a line renderer to draw any lines in unity.

How do you make a light amplification by stimulated emission of radiation in unity?

Depending on how basic you want to go, you tin use a line renderer to draw your lazer beam beyond the co ordinates of your ray cast. If y'all want something more than effect rich you may want to apply a particle effect.

Last words

Thank you for following this tutorial on line rendering in unity 2d and 3d. If you liked this tutorial please share it on social media and consider subscribing to my youtube channel hither: https://world wide web.youtube.com/channel/UC1i4hf14VYxV14h6MsPX0Yw

I have as well a agglomeration of other tutorials on game development in full general. And then feel free to check out some of those tutorials and articles from this list.