如何在Forge Viewer中创建节框

Question

我想在伪造查看器中构建一个节框。我通过区域标记获得了minx，maxX，minY，maxY。另外，我通过级别选择（级别[i] .elevation – globalOffset.Z）获得了minZ和maxZ。

我想要类似的功能，例如“剖面分析”中的默认“添加框”按钮，但我想添加最小最大坐标

您能帮我吗？

Answer 1

在这里〜请参考以下代码片段为查看器计算切面参数：

const minPt = new THREE.Vector3( -82.73119354248047, -115.42709350585938, -31.42848777770996 ); //!<<< put your point here
const maxPt = new THREE.Vector3( -0.0000020212402347397074, 0, 0 ); //!<<< put your point here

const normals = [
    new THREE.Vector3(1, 0, 0), 
    new THREE.Vector3(0, 1, 0), 
    new THREE.Vector3(0, 0, 1),
    new THREE.Vector3(-1, 0, 0),
    new THREE.Vector3(0, -1, 0),
    new THREE.Vector3(0, 0, -1)
];

const bbox = new THREE.Box3( minPt, maxPt );
const cutPlanes = [];

for( let i = 0; i < normals.length; i++ ) {
    const plane = new THREE.Plane( normals[i], -1 * maxPt.dot( normals[i] ) );

    // offset plane with negative normal to form an octant
    if( i > 2 ) {
        const ptMax = plane.orthoPoint( bbox.max );
        const ptMin = plane.orthoPoint( bbox.min );
        const size = new THREE.Vector3().subVectors( ptMax, ptMin );
        plane.constant -= size.length();
    }

    const n = new THREE.Vector4( plane.normal.x, plane.normal.y, plane.normal.z, plane.constant );
    cutPlanes.push( n );
}

viewer.setCutPlanes( cutPlanes );