CODEWITHSUNDEEP
javascriptthree.js
Naftali Beder
Naftali Beder

Reputation: 1086

'Vector is undefined' warning when cloning vertices in a THREE.Geometry object

I want to dynamically add new faces to a mesh. I keep getting this console warning:

THREE.BufferAttribute.copyVector3sArray(): vector is undefined

This is the simplest example that still causes it. It works - this example correctly produces a single triangle that's a clone of the geometry's first face - but I can't get rid of the warning.

var vertices = this.body.geometry.vertices;
var faces = this.body.geometry.faces;

var face = faces[0];
var a = face.a;
var b = face.b;
var c = face.c;

var va = vertices[a].clone();
var vb = vertices[b].clone();
var vc = vertices[c].clone();

vertices = [];
vertices.push(va);
vertices.push(vb);
vertices.push(vc);

this.body.geometry.vertices = vertices;
this.body.geometry.faces = faces;

It looks a lot like this question, except that I'm not accidentally assigning a vector to a vertex's index, so I can't use that solution.

Upvotes: 0

Views: 457

Answers (1)

Naftali Beder
Naftali Beder

Reputation: 1086

It appears the undefined vector was a vertex normal. Running

this.body.geometry.computeFlatVertexNormals();

solved the problem. (Alternatively, the normals could be calculated by running computeFaceNormals() or computeVertexNormals().)

Upvotes: 1

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