在 Forge 查看器中，我可以添加一个新的 THREE.Object3D，但我不能在查看器中 select 它。

Question

在 Forge Viewer 中，我编写了一个自定义处理程序。它有一个绑定的双击事件，当它触发该事件时，计算被点击的项目

const hitTest = this.viewer.clientToWorld(event.canvasX, event.canvasY, true);

对于正常的 object/mesh/material，它工作正常，返回 hitTest.dbId，加上一个 hitTest.point 对象指示我在 3D space 中单击的位置。我使用该位置创建一个 material、网格和对象，然后添加到场景中。（跳过了几个小步骤）

var material_orange = new THREE.MeshLambertMaterial({color: 0xFEBD17});
this.viewer.impl.matman().addMaterial('SBD-Material-' + 'orange', material_orange, true);
var sphereMesh =
         new THREE.Mesh(
                new THREE.SphereGeometry(niceRadius, 20),
                material_orange);
var sphereModel = new THREE.Object3D();
sphereModel.add(sphereMesh);
sphereModel.position.set(atPoint.x, atPoint.y, atPoint.z);

this.viewer.impl.scene.add(sphereModel);
this.viewer.impl.invalidate(true);

一切都很好。球体已添加到我的模型中。（是黑色的，至今想不通为什么。。。）但是最大的问题是球体点击不了。单击它会选择模型中的底层对象，通常是墙壁或地板。

我是否需要使用RayTrace 方法来获取场景中的对象？或者是否有属性到 object/mesh/material 使其可点击？查看器更新？

Answer 1

此时，您必须创建一个继承Autodesk.Viewing.ToolInterface 的自有工具，并将您的点击逻辑放在handleSingleClick 函数中。这是这种情况的示例：

自定义工具：

class CustomTool extends Autodesk.Viewing.ToolInterface {
    constructor( viewer ) {
        super();
        this._viewer = viewer;
        this._active = false;
        this._names = [ 'CustomTool' ];
    }

    get viewer() {
        return this._viewer;
    }

    isActive() {
        return this._active;
    }

    handleSingleClick( event, button ) {
        const _viewer = this.viewer;
        const intersectObjects = (function () {
            const pointerVector = new THREE.Vector3();
            const pointerDir = new THREE.Vector3();
            const ray = new THREE.Raycaster();
            const camera = _viewer.impl.camera;

            return function(pointer, objects, recursive) {
                const rect = _viewer.impl.canvas.getBoundingClientRect();
                const x = (( pointer.clientX - rect.left) / rect.width ) * 2 - 1;
                const y = - (( pointer.clientY - rect.top) / rect.height ) * 2 + 1;

                if (camera.isPerspective) {
                    pointerVector.set( x, y, 0.5 );
                    pointerVector.unproject( camera );
                    ray.set( camera.position, pointerVector.sub( camera.position ).normalize() );
                } else {
                    pointerVector.set( x, y, -1 );
                    pointerVector.unproject( camera );
                    pointerDir.set( 0, 0, -1 );
                    ray.set( pointerVector, pointerDir.transformDirection( camera.matrixWorld ) );
                }

                const intersections = ray.intersectObjects( objects, recursive );
                return intersections[0] ? intersections[0] : null;
            };
        })();

        const pointer = event.pointers ? event.pointers[ 0 ] : event;
        // Intersect objects in the scene
        const result = intersectObjects( pointer, _viewer.impl.scene.children );

        if( result && result.object ) {
            const mesh = result.object;
            // Change object color
            let curColor = mesh.material.color;
            curColor = ( curColor.getHex() == 0xff0000 ? 0x00ff00 : 0xff0000 );
            mesh.material.color.setHex( curColor );

            // Refreah viewport
            this.viewer.impl.invalidate( false, true, true );
        }

        return false;
    }
}

查看器扩展管理此自定义工具：

class CustomToolExtension extends Autodesk.Viewing.Extension {
    constructor( viewer, options ) {
        super( viewer, options );
        this._tool = undefined;
    }

    load() {
        // Construct an custom Tool instance
        this._tool = new CustomTool( this.viewer );
        // Register custom Tool into viewer.toolController
        this.viewer.toolController.registerTool( this._tool );
        // Activate the Tool
        this.viewer.toolController.activateTool( 'CustomTool' );

        return true;
    }

    unload() {
        // If tool has been activated, deactivate the tool.
        if( this._tool.isActive() ) {
            this.viewer.toolController.deactivateTool( 'CustomTool' );
        }
       // Deregister custom Tool 
        this.viewer.toolController.deregisterTool( this._tool );

        return true;
    }
}

Autodesk.Viewing.theExtensionManager.registerExtension( 'Autodesk.ADN.Sample.CustomToolExtension', CustomToolExtension );

希望对您有所帮助。

在 Forge 查看器中，我可以添加一个新的 THREE.Object3D，但我不能在查看器中 select 它。

In the forge viewer I can add a new THREE.Object3D, but I can't select it in the viewer.

autodesk-forge