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POSome faces of a THREE.Mesh object are not displayed
 

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  1. POSome faces of a THREE.Mesh object are not displayed
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    <p>I use the three.js librairy to code in WebGL, and I would like use shaders. My objects are THREE.Mesh objects.</p> <p>To use shaders I create three buffer to transmit to informations to shaders.</p> <ul> <li>VerticesArray which contains all vertices of the object.</li> <li>NormalsArray which contains all normals of points.</li> <li>IndicesArray which contains the rank of vertices in verticesArray. (faces are triangles, so three indices link three vertices of a same face).</li> </ul> <p>To create theses array I do this :</p> <pre><code> this.mesh = new THREE.Mesh( new THREE.SphereGeometry( 15, 15, 15 ), new THREE.MeshLambertMaterial( { color: 0xF40029 } ) ); this.vertices = new Array(); for(var i = 0 ; i &lt; this.mesh.geometry.vertices.length ; i++){ this.vertices.push(this.mesh.geometry.vertices[i].x); this.vertices.push(this.mesh.geometry.vertices[i].y); this.vertices.push(this.mesh.geometry.vertices[i].z); } this.normals = new Array(); for(var i = 0 ; i &lt; this.mesh.geometry.faces.length ; i++){ this.normals[this.mesh.geometry.faces[i].a*3] = this.mesh.geometry.faces[i].vertexNormals[0].x; this.normals[this.mesh.geometry.faces[i].a*3+1] = this.mesh.geometry.faces[i].vertexNormals[0].y; this.normals[this.mesh.geometry.faces[i].a*3+2] = this.mesh.geometry.faces[i].vertexNormals[0].z; this.normals[this.mesh.geometry.faces[i].b*3] = this.mesh.geometry.faces[i].vertexNormals[1].x; this.normals[this.mesh.geometry.faces[i].b*3+1] = this.mesh.geometry.faces[i].vertexNormals[1].y; this.normals[this.mesh.geometry.faces[i].b*3+2] = this.mesh.geometry.faces[i].vertexNormals[1].z; this.normals[this.mesh.geometry.faces[i].c*3] = this.mesh.geometry.faces[i].vertexNormals[2].x; this.normals[this.mesh.geometry.faces[i].c*3+1] = this.mesh.geometry.faces[i].vertexNormals[2].y; this.normals[this.mesh.geometry.faces[i].c*3+2] = this.mesh.geometry.faces[i].vertexNormals[2].z; } this.indices = new Array(); for(var i = 0 ; i &lt; this.mesh.geometry.faces.length ; i++){ this.indices.push(this.mesh.geometry.faces[i].a); this.indices.push(this.mesh.geometry.faces[i].b); this.indices.push(this.mesh.geometry.faces[i].c); } this.vertexBuffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer); gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(this.vertices), gl.STATIC_DRAW); this.normalBuffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, this.normalBuffer); gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(this.normals), gl.STATIC_DRAW); this.indexBuffer = gl.createBuffer(); gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer); gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(this.indices), gl.STREAM_DRAW); this.indexCount = this.indices.length; </code></pre> <p>At this step, I have a strange problem, on the display I can see my two subjects but some Faces are not displayed.</p> <p>Do you have an idea to solve my problem ?</p> <p>We can see my problem on the following picture. I display two balls. <a href="http://img341.imageshack.us/img341/1094/ballsk.jpg" rel="nofollow">http://img341.imageshack.us/img341/1094/ballsk.jpg</a></p> <p>Thanks for your response.</p>
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