WebGL

Question

我已经创建了一个 blazor web assembly 项目，并且正在尝试使用 JSInterop 来使用 Three.JS 画一条线，按照他们位于 Here 的教程。我在我的 csproj 文件中安装了 Three.JS 使用 npm 和 webpack 以及预构建事件。

<Target Name="PreBuild" BeforeTargets="PreBuildEvent">
    <Exec Command="npm install" WorkingDirectory="NpmJS" />
    <Exec Command="npm run build" WorkingDirectory="NpmJS" />
</Target>

问题是 canvas 呈现为黑色，没有其他任何东西，而控制台显示几个错误。任何调试帮助将不胜感激。我知道我处于未知领域，因为使用 Three.js 和来自 blazor 的 webgl 功能不全。这是第一个错误：

crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: (intermediate value).setFromPoints is not a function
      TypeError: (intermediate value).setFromPoints is not a function
          at Object.drawLine (https://localhost:44370/javascript/threeTutorial.js:21:53)
          at https://localhost:44370/_framework/blazor.webassembly.js:1:3942
          at new Promise (<anonymous>)
          at Object.beginInvokeJSFromDotNet (https://localhost:44370/_framework/blazor.webassembly.js:1:3908)
          at Object.w [as invokeJSFromDotNet] (https://localhost:44370/_framework/blazor.webassembly.js:1:64232)
          at _mono_wasm_invoke_js_blazor (https://localhost:44370/_framework/dotnet.5.0.10.js:1:190800)
          at do_icall (<anonymous>:wasm-function[10596]:0x194e4e)
          at do_icall_wrapper (<anonymous>:wasm-function[3305]:0x79df9)
          at interp_exec_method (<anonymous>:wasm-function[2155]:0x44ad3)
          at interp_runtime_invoke (<anonymous>:wasm-function[7862]:0x12efff)

开发人员控制台中的调试显示 THREE.BufferGeometry() 未定义，错误似乎是因为当时试图在未定义的对象上调用该方法。

我的 Razor 页面代码如下所示：

namespace MyProject.Shared.Components
{
    /// <summary>
    /// The canvas for browser rendering using Webgl.
    /// </summary>
    public partial class GameCanvas : MyLayoutComponentBase
    {       

        protected override async Task OnAfterRenderAsync(bool firstRender)
        {
            if (firstRender)
            {
                await JSRuntime.InvokeVoidAsync("threeTutorial.drawLine");
            }
        }
    }
}

我的Javascript文件：

window.threeTutorial = {
    drawLine: function () {
        const renderer = new THREE.WebGLRenderer();
        renderer.setClearColor(new THREE.Color(0xEEEEEE, 1.0));
        renderer.setSize(window.innerWidth, window.innerHeight);
        document.getElementById("gameCanvas").appendChild(renderer.domElement);

        const camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 500);
        camera.position.set(0, 0, 100);
        camera.lookAt(0, 0, 0);

        const scene = new THREE.Scene();
        //create a blue LineBasicMaterial
        const material = new THREE.LineBasicMaterial({ color: 0x0000ff });

        const points = [];
        points.push(new THREE.Vector3(- 10, 0, 0));
        points.push(new THREE.Vector3(0, 10, 0));
        points.push(new THREE.Vector3(10, 0, 0));

        const geometry = new THREE.BufferGeometry().setFromPoints(points);

        const line = new THREE.Line(geometry, material);

        scene.add(line);
        renderer.render(scene, camera);
    }
}

我还在我的 wwwroot.index.html 页面中添加了以下脚本：

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r79/three.min.js"></script>
<script src="javascript/threeTutorial.js"></script>

并且正在我的 NpmJS.src.index.js 文件中导入三个：

import * as THREE from 'three';

Answer 1

犯人849的评论正确：

“尝试 three.js 的更新（最新）版本。IIRC，r79 没有实现 BufferGeometry 的 .setFromPoints()”

WebGL - 黑色 Canvas 和控制台错误 Three.JS 和 Blazor

WebGL - Black Canvas and console errors with Three.JS and Blazor

javascript

c#

three.js

blazor-webassembly