Procedurally generated mesh JS - explain the error please

Question

Hey guys, I decided to try my luck at procedurally generating meshes. I've tried following this guide, but since it's in C# I wanted to translate it into JS. Since the general idea translates I thought I was managing quite well, but there are some compiler errors I keep getting that I cannot explain.

It's probably something extremely simple and stupid I'm doing wrong/overlooking and might very well have to do with me not understanding built in arrays very well (finding unity related documentation on them is proving difficult)

TBH I'm just a noob when it comes to scripting who helps out the even lesser noobs around here ^.^ Also, it's late, I'm tired and I need heeeelp :p I've added text explaining the code and pointing out the errors.

@MenuItem ("GameObject/Create Other/Tetrahedron") //add it to the menu

static function CreateTetrahedron () {

 var Tetrahedron : GameObject = new GameObject ("Tetrahedron");  //create an empty gameobject with that name

 Tetrahedron.AddComponent(MeshFilter);                           //add a meshfilter

 var p0 : Vector3 = Vector3(0,0,0);                              //the four points that make a tetrahedron
 var p1 : Vector3 = Vector3(1,0,0);
 var p2 : Vector3 = Vector3(0.5f,0,Mathf.Sqrt(0.75f));
 var p3 : Vector3 = Vector3(0.5f,Mathf.Sqrt(0.75f),Mathf.Sqrt(0.75f)/3);

 var newVertices : Vector3[] = new Vector3[] {                   //the non-shared vertices (line 14)
     p0,p1,p2,p0,                                                //Assets/Editor/Tetrahedron.js(14,50): BCE0044: expecting (, found '['.
     p2,p3,p2,p1,                                                //Assets/Editor/Tetrahedron.js(15,19): BCE0044: expecting :, found ','.
     p3,p0,p3,p1
 };

 var newTriangles : int[] = new int[]{                           //the triangle faces the points make up
     0,1,2,
     0,2,3,
     2,1,3,
     0,3,1
 };

 var newMesh : Mesh = new Mesh ();                               //create a new mesh, assign the vertices and triangles
     newMesh.vertices = newVertices;
     newMesh.triangles = newTriangles;
     newMesh.RecalculateNormals();                               //recalculate normals, bounds and optimize
     newMesh.RecalculateBounds();
     newMesh.Optimize();                             

 Tetrahedron.GetComponent(MeshFilter).mesh = newMesh;            //assign the created mesh as the used mesh

Answer 1

Best Answer

Answer by loramaru · May 05, 2011 at 03:42 AM

The problem is that you're using the C# array initialization. Here's what you want for JavaScript.

var newVertices : Vector3[] = [ p0,p1,p2,p0, p2,p3,p2,p1, p3,p0,p3,p1 ];

var newTriangles : int[] = [
    0,1,2,
    0,2,3,
    2,1,3,
    0,3,1
];

Also you had one more error that crops up once those are fixed; so here's a bonus fix. :)

(Tetrahedron.GetComponent(MeshFilter) as MeshFilter).mesh = newMesh;

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Joshua · May 05, 2011 at 03:44 AM 0

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Haha , proves how blind you become when you stare too long at something. Thanks a lot :-)

loramaru · May 05, 2011 at 03:50 AM 0

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Also you mixed up the vertices from the second example with the triangles from the first. Your code will generate a flat triangle. You really want... var newTriangles : int[] = [0,1,2,3,4,5,6,7,8,9,10,11];

Joshua · May 05, 2011 at 03:56 AM 0

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Yes! Thank you! I got it to work :D thank you very very very very much!

keenanwoodall · Jul 15, 2014 at 04:37 PM 0

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How would I make the mesh visible, i couldn't figure it out

keenanwoodall · Jul 15, 2014 at 05:28 PM 0

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How would I make the pyramid visible? I've tried adding a renderer but I couldn't get it to work

Procedurally generated mesh JS - explain the error please

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