如何让相机聚焦在物体上并使用 Babylonjs 将其保持在中心焦点？答案

【问题标题】：How do I get the camera to focus on the object and keep it in center focus using Babylonjs?如何让相机聚焦在物体上并使用 Babylonjs 将其保持在中心焦点？
【发布时间】：2021-02-27 11:54:57
【问题描述】：

我真正想要的是把网格放在物体上，然后让相机聚焦在那个网格上。我认为他们使用lookAt函数来做到这一点，但我不知道如何正确使用它。

我从这个页面得到了帮助：https://www.babylonjs-playground.com/#1CSVHO#12

我尝试了一些函数演示。

 setCamera_Mesh = () => {
        let { currentWidth, currentDepth, rowCount } = this.currentConfig;
        let sphere = Mesh.CreateSphere("sphere", 1, this.scene);
        let referenceBox = Mesh.CreateBox("referenceBox", { width: 1, height: 1, depth: 1, updatable: true });


        sphere.scaling = new Vector3(0.1, 0.1, 0.1);
        sphere.position = this.scene.cameras[0].position;
        sphere.parent = this.scene.cameras[0];

        this.referenceBox && this.referenceBox.dispose()

        referenceBox.position = new Vector3(0, 0, 0.08);

        referenceBox.enableEdgesRendering();
        referenceBox.edgesWidth = 1;
        referenceBox.edgesColor = new Color4(0, 0, 1, 0.05);
        referenceBox.visibility = 0.5;
        referenceBox.scaling = new Vector3(currentDepth / 40, rowCount / 3, currentWidth / 100);


        this.referenceBox = referenceBox;
        sphere.lookAt(referenceBox.position);
    }

【问题讨论】：

标签： reactjs camera mesh babylonjs

【解决方案1】：

我必须使用 setParent () 而不是 .parent 我将相机添加为父级。

当我编辑如下代码时，它工作正常。

setCameraToMesh = () => {
        let { currentWidth, currentDepth, rowCount } = this.currentConfig;
        let sphere = MeshBuilder.CreateSphere("referenceSphere", this.scene);
        let referenceBox = MeshBuilder.CreateBox("referenceBox", { width: 0.1, height: 0.1, depth: 0.1, updatable: true });

        sphere.scaling = new Vector3(0.1, 0.1, 0.1);
        sphere.position = this.scene.cameras[0].position;
        sphere.setParent(this.scene.cameras[0]);
        this.referenceBox && this.referenceBox.dispose()

        referenceBox.position = new Vector3(0, rowCount / 500, 0.08);
        referenceBox.enableEdgesRendering();
        referenceBox.edgesWidth = 1;
        referenceBox.edgesColor = new Color4(0, 0, 1, 0.05);
        referenceBox.visibility = 0.05;
        referenceBox.scaling = new Vector3(currentDepth / 40, rowCount / 3, currentWidth / 100);

        this.referenceBox = referenceBox;

        sphere.lookAt(referenceBox.absolutePosition);    
        this.scene.cameras[0].focusOn([referenceBox], true);
    }

【讨论】：