选择框 投影点

__test__/Geometry/Vector3Ext.test.ts

@@ -0,0 +1,14 @@
+import { Vector3Ext } from '../../src/Geometry/Vector3Ext';
+import * as THREE from "three";
+test("测试平行", () =>
+{
+
+    let v1 = new Vector3Ext(0, 0, 1);
+    let v2 = new Vector3Ext(0.0001, 0, 1);
+    expect(v1.isParallelTo(v2)).toBe(false);
+    expect(v1.equals(new THREE.Vector3(0, 0, 1))).toBe(true);
+    expect(v2.equals(new THREE.Vector3(0.0001, 0, 1))).toBe(true);
+    // console.log(v1.isParallelTo(v2));
+    // console.log(v1);
+    // console.log(v2);
+})

src/Editor/SelectSet.ts

@@ -2,6 +2,7 @@ import { Vector3, Matrix4 } from 'three';
 import { Entity } from '../DatabaseServices/Entity';
 import * as THREE from 'three';
 import { PlaneExt } from '../Geometry/Plane';
+import { GeUtils } from '../Geometry/GeUtils';
 
 
 //
@@ -25,6 +26,7 @@ export class SelectBox
     // m_Min: Vector3;
     // m_Max: Vector3;
 
+    private m_SelPolyPtsBuff: Map<string, Array<Vector3>> = new Map<string, Array<Vector3>>();
 
     /**
      * 获得投影的点表.
@@ -35,15 +37,20 @@ export class SelectBox
      */
     getProjectionPts(planDir: THREE.Vector3): Array<Vector3>
     {
+        if (GeUtils.isParallelTo(planDir, this.m_ViewNormal))
+            return [];
+        let dirStr = GeUtils.ptToString(planDir);
+        if (this.m_SelPolyPtsBuff.has(dirStr))
+            return this.m_SelPolyPtsBuff.get(dirStr)
         let plan = new PlaneExt(planDir);
-        this.m_SelPolyPts.map(p =>
+        let pts = this.m_SelPolyPts.map(p =>
         {
             let l = new THREE.Line3(p, p.clone().add(this.m_ViewNormal));
             return plan.intersectLine(l, null, true);
-        })
-        return [];
+        });
+        this.m_SelPolyPtsBuff.set(dirStr, pts);
+        return pts;
     }
-
 }
 
 export class SelectSet
@@ -56,4 +63,5 @@ export class SelectSet
     m_SelectEntityCollection: Array<Entity> = [];
     m_SelectBox: SelectBox;
 
-}
+}
+

src/Geometry/GeUtils.ts

@@ -1,6 +1,7 @@
 import { Vector3, Matrix4 } from 'three';
 import * as THREE from 'three';
-namespace GeUtils
+import { Vector3Ext } from './Vector3Ext';
+export namespace GeUtils
 {
 
     export const cZeroVec = new THREE.Vector3();
@@ -41,5 +42,27 @@ namespace GeUtils
         mat.lookAt(cZeroVec, dir, up);
         return mat;
     }
+
+    export function isParallelTo(v1: THREE.Vector3, v2: THREE.Vector3)
+    {
+        let vx1 = new Vector3Ext().copy(v1);
+        let vx2 = new Vector3Ext().copy(v2);
+        return vx1.isParallelTo(vx2);
+    }
+
+    export function ptToString(v: THREE.Vector3, fractionDigits: number = 3): string
+    {
+        return v.toArray().map(o =>
+        {
+            return o.toFixed(fractionDigits)
+        }).join(",")
+    }
 }
 
+
+let v = new THREE.Vector3(1.224444444)
+
+let s = GeUtils.ptToString(v);
+
+console.log(s);
+

src/Geometry/Vector3Ext.ts

@@ -0,0 +1,24 @@
+
+
+import * as THREE from "three";
+
+export class Vector3Ext extends THREE.Vector3
+{
+    constructor(x?: number, y?: number, z?: number)
+    {
+        super(x, y, z);
+    }
+
+    /**
+     * 平行,精度大概为1e-5.
+     * 
+     * @export
+     * @param {THREE.Vector3} v 
+     * @returns {boolean} 
+     */
+    isParallelTo(v: Vector3Ext): boolean
+    {
+        let v2 = this.clone().cross(v);
+        return v2.lengthSq() < 1e-10;
+    }
+}