分离模型

objects/育苗盘.js

@@ -0,0 +1,47 @@
+import * as THREE from 'three';
+import { SUBTRACTION, Brush, Evaluator } from 'three-bvh-csg';
+
+class CSGHexNutGeometry extends THREE.BufferGeometry {
+    constructor(radius = 1, height = 0.5, holeRadius = 0.6) {
+        super();
+
+        this.parameters = {
+            radius: radius,
+            height: height,
+            holeRadius: holeRadius
+        };
+
+        this.buildGeometry();
+    }
+
+    buildGeometry() {
+        const radius = this.parameters.radius;
+        const height = this.parameters.height;
+        const holeRadius = this.parameters.holeRadius;
+
+        // 创建螺丝帽主体 (六棱柱)
+        const hexagonGeometry = new THREE.CylinderGeometry(radius, radius, height, 6, 1, false);
+        const hexagonMesh = new THREE.Mesh(hexagonGeometry); // 注意这里没有材质
+        const hexagonBrush = new Brush(hexagonMesh.geometry); // 使用 Brush 构造函数
+
+        // 创建内部的孔洞 (圆柱体)
+        const holeHeight = height + 0.1;
+        const holeGeometry = new THREE.CylinderGeometry(holeRadius, holeRadius, holeHeight, 32);
+        const holeMesh = new THREE.Mesh(holeGeometry); // 注意这里没有材质
+        const holeBrush = new Brush(holeMesh.geometry); // 使用 Brush 构造函数
+
+        // 执行布尔运算 (差集)
+        const evaluator = new Evaluator();
+        const resultBrush = evaluator.evaluate(hexagonBrush, holeBrush, SUBTRACTION);
+
+        // 将布尔运算结果转换为 BufferGeometry
+        const finalGeometry = resultBrush.geometry;
+
+        // 将结果的属性复制到当前的 BufferGeometry 实例
+        this.setAttribute('position', finalGeometry.getAttribute('position'));
+        this.setIndex(finalGeometry.getIndex());
+        this.computeVertexNormals(); // 计算法线
+    }
+}
+
+export { CSGHexNutGeometry };