Creating a plane mesh directly from code

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Hi

As in topic-I'd like to create a small Plane fully programatically.How to do that? I think I have to create a new GameObject then add MeshFilter and MeshRenderer components to it.But what's next?

Answer 1

Best Answer

Answer by zmar0519 · Jul 06, 2011 at 12:01 PM

you could use gameObject.CreatePrimitive(PrimitiveType.Plane);, but that will give you the ten by ten vertice plane we get from the gameObject Menu. I reccomend trying the below code. It will give you a four vertice and two tri plane.

 var size : float;
 function Awake()
 {
      var m : Mesh = new Mesh();
      m.name = "Scripted_Plane_New_Mesh";
      m.vertices = [Vector3(-size, -size, 0.01), Vector3(size, -size, 0.01), Vector3(size, size, 0.01), Vector3(-size, size, 0.01) ];
      m.uv = [Vector2 (0, 0), Vector2 (0, 1), Vector2(1, 1), Vector2 (1, 0)];
      m.triangles = [0, 1, 2, 0, 2, 3];
      m.RecalculateNormals();
      var obj : GameObject = new GameObject("New_Plane_Fom_Script", MeshRenderer, MeshFilter, MeshCollider);
      obj.GetComponent(MeshFilter).mesh = m;
 }

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MasterBLB · Jul 06, 2011 at 04:23 PM 0

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I've created something similliar,but there is a problem with visibility :/

Take a look: http://answers.unity3d.com/questions/140070/mesh-created-in-code-is-not-visible.html

proto_script · Sep 29, 2013 at 09:28 PM 3

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Thanks for the code! I created a C# function for $$anonymous$$esh creation (based on the code above), modified to take width and height parameters.

 $$anonymous$$esh Create$$anonymous$$esh(float width, float height)
 {
     $$anonymous$$esh m = new $$anonymous$$esh();
     m.name = "Scripted$$anonymous$$esh";
     m.vertices = new Vector3[] {
         new Vector3(-width, -height, 0.01f),
         new Vector3(width, -height, 0.01f),
         new Vector3(width, height, 0.01f),
         new Vector3(-width, height, 0.01f)
     };
     m.uv = new Vector2[] {
         new Vector2 (0, 0),
         new Vector2 (0, 1),
         new Vector2(1, 1),
         new Vector2 (1, 0)
     };
     m.triangles = new int[] { 0, 1, 2, 0, 2, 3};
     m.RecalculateNormals();
         
     return m;
 }

I call that function from the Awake() function, creating an object to apply the mesh to and setting up the shader and material (to apply a colour):

 void Awake() {
     GameObject plane = new GameObject("Plane");
     $$anonymous$$eshFilter meshFilter = ($$anonymous$$eshFilter)plane.AddComponent(typeof($$anonymous$$eshFilter));
     meshFilter.mesh = Create$$anonymous$$esh(1, 0.2f);
     $$anonymous$$eshRenderer renderer = plane.AddComponent(typeof($$anonymous$$eshRenderer)) as $$anonymous$$eshRenderer;
     renderer.material.shader = Shader.Find ("Particles/Additive");
     Texture2D tex = new Texture2D(1, 1);
     tex.SetPixel(0, 0, Color.green);
     tex.Apply();
     renderer.material.mainTexture = tex;
     renderer.material.color = Color.green;
 }

Answer 2

Answer by Eric5h5 · Jul 05, 2011 at 06:33 PM

See the CreatePlane script on the wiki.

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MasterBLB · Jul 06, 2011 at 09:13 AM 1

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Hmmmm and what about struct Plane I've found in code?Have I to make the mesh by assigning those verticles manually,or I just can use that struct?

Eric5h5 · Jul 06, 2011 at 03:21 PM 1

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@$$anonymous$$asterBLB: that's a mathematical plane. Nothing to do with visual planes.

sosh · Nov 12, 2014 at 02:07 PM 0

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There doesn't seem to be a website at that address. Has this moved?

Bunny83 · Nov 12, 2014 at 02:26 PM 0

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@sosh: Yes it has moved as Unity now hosts the wiki on it's own domain. For a long time the old domain was redirected to the new one, but now the domain seems to be outdated. I've fixed the link.

Rin · Dec 09, 2014 at 02:34 AM 0

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This doesn't seem to work I get a C1061 error from it

Answer 3

Answer by Chris D · Jul 05, 2011 at 06:28 PM

The documentation on the Mesh functions is pretty thorough. Point 1 has a code example to build a mesh from scratch:

 1. Building a mesh from scratch: should always be done in the following order: 1) assign vertices 2) assign triangles

 var newVertices : Vector3[];
 var newUV : Vector2[];
 var newTriangles : int[];
 
 function Start () {
     var mesh : Mesh = new Mesh ();
     GetComponent(MeshFilter).mesh = mesh;
     mesh.vertices = newVertices;
     mesh.uv = newUV;
     mesh.triangles = newTriangles;
 }

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Answer 4

Answer by sysmaya · Jan 30, 2017 at 10:37 AM

 GameObject plane = GameObject.CreatePrimitive(PrimitiveType.Plane);
 
 // Position and rotation plane
 plane.transform.position = new Vector3(1f, 2f, 3f);

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Creating a plane mesh directly from code

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