47 lines
1.4 KiB
TypeScript
47 lines
1.4 KiB
TypeScript
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import * as THREE from 'three';
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import { Vector3, Line3 } from "three";
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export class PlaneExt extends THREE.Plane
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{
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constructor(normal?: THREE.Vector3, constant?: number)
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{
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super(normal, constant);
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}
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intersectLine(line: Line3, optionalTarget?: Vector3, extendLine?: boolean): Vector3
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{
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let v1 = new Vector3();
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let result = optionalTarget || new Vector3();
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let direction = line.delta(v1);
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let denominator = this.normal.dot(direction);
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if (denominator === 0)
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{
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// line is coplanar, return origin
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if (this.distanceToPoint(line.start) === 0)
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{
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return result.copy(line.start);
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}
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// Unsure if this is the correct method to handle this case.
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return undefined;
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}
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let t = - (line.start.dot(this.normal) + this.constant) / denominator;
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//If you not extendLine,check intersect point in Line
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if (!extendLine && (t < 0 || t > 1))
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{
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return undefined;
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}
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return result.copy(direction).multiplyScalar(t).add(line.start);
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}
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intersectRay(ray: THREE.Ray, optionalTarget?: Vector3, extendLine?: boolean): Vector3
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{
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// 从射线初始位置
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let line = new THREE.Line3(ray.origin.clone(), ray.origin.clone().add(ray.direction));
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return this.intersectLine(line, optionalTarget, extendLine);
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}
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}
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