三个JS Map Material导致WebGL警告

Question

我正在尝试通过以下包装函数定义从OBJLoader加载的网格物料:

function applyTexture(src){
    var texture = new THREE.Texture();
    var loader = new THREE.ImageLoader();
    loader.addEventListener( 'load', function ( event ) {
        texture.image = event.content;
        texture.needsUpdate = true;

        // find the meshes from the loaded OBJ and apply the texture to it.
        object.traverse( function ( child ) {
            if ( child instanceof THREE.Mesh ) {
                if(child.name.indexOf("Lens") < 0){
                    child.dynamic = true;

                   child.material = new THREE.MeshLambertMaterial( { color: 0xdddddd, shading: THREE.FlatShading, map : texture } );
                   // also tried:
                   //child.material = new THREE.MeshPhongMaterial( { color: 0x000000, specular: 0x666666, emissive: 0x000000, ambient: 0x000000, shininess: 10, shading: THREE.SmoothShading, map : texture} );
                   // and:
                   //child.material = new THREE.MeshBasicMaterial({map : texture});
                   child.material.map = texture; // won't throw the WebGL Warning, but won't show the texture either;
               } else {
                   // works just fine.
                   child.material = new THREE.MeshPhongMaterial( { color: 0x000000, specular: 0x666666, emissive: 0x000011, ambient: 0x000000, shininess: 10, shading: THREE.SmoothShading, opacity: 0.6, transparent: true } );
               }
            }
        });
    });
    loader.load( src );
}

当纹理加载并且是时候将材质应用于网格物体时,我开始在控制台上收到以下警告:

.WebGLRenderingContext: GL ERROR :GL_INVALID_OPERATION : glDrawElements: attempt to access out of range vertices in attribute 0 

并且网格本身消失了.

我在这做错了什么？

UPDATE

正如@WestLangley指出的那样:在渲染完东西之后,永远不要尝试应用纹理/材质.在将对象渲染到场景之前创建材质,然后使用以下命令更改它们:

obj.material.map = texture

Answer 1

在WebGLRenderer网格渲染一次后,您无法从没有纹理的材质切换到具有纹理的材质.这是因为,如果没有初始纹理,几何体将不具有必要的烘焙WebGL UV缓冲区.

解决方法是从具有简单白色纹理的材料开始.

更新:或者,您可以从无纹理材质开始,然后在添加纹理时设置以下标志:

material.needsUpdate = true;
geometry.buffersNeedUpdate = true;
geometry.uvsNeedUpdate = true;

three.js r.58