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2b7aae2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | import { Matrix3 } from './Matrix3.js';
import { Vector3 } from './Vector3.js';
const _vector1 = /*@__PURE__*/ new Vector3();
const _vector2 = /*@__PURE__*/ new Vector3();
const _normalMatrix = /*@__PURE__*/ new Matrix3();
class Plane {
constructor(normal = new Vector3(1, 0, 0), constant = 0) {
// normal is assumed to be normalized
this.normal = normal;
this.constant = constant;
}
set(normal, constant) {
this.normal.copy(normal);
this.constant = constant;
return this;
}
setComponents(x, y, z, w) {
this.normal.set(x, y, z);
this.constant = w;
return this;
}
setFromNormalAndCoplanarPoint(normal, point) {
this.normal.copy(normal);
this.constant = -point.dot(this.normal);
return this;
}
setFromCoplanarPoints(a, b, c) {
const normal = _vector1.subVectors(c, b).cross(_vector2.subVectors(a, b)).normalize();
// Q: should an error be thrown if normal is zero (e.g. degenerate plane)?
this.setFromNormalAndCoplanarPoint(normal, a);
return this;
}
copy(plane) {
this.normal.copy(plane.normal);
this.constant = plane.constant;
return this;
}
normalize() {
// Note: will lead to a divide by zero if the plane is invalid.
const inverseNormalLength = 1.0 / this.normal.length();
this.normal.multiplyScalar(inverseNormalLength);
this.constant *= inverseNormalLength;
return this;
}
negate() {
this.constant *= -1;
this.normal.negate();
return this;
}
distanceToPoint(point) {
return this.normal.dot(point) + this.constant;
}
distanceToSphere(sphere) {
return this.distanceToPoint(sphere.center) - sphere.radius;
}
projectPoint(point, target) {
return target.copy(this.normal).multiplyScalar(-this.distanceToPoint(point)).add(point);
}
intersectLine(line, target) {
const direction = line.delta(_vector1);
const denominator = this.normal.dot(direction);
if (denominator === 0) {
// line is coplanar, return origin
if (this.distanceToPoint(line.start) === 0) {
return target.copy(line.start);
}
// Unsure if this is the correct method to handle this case.
return null;
}
const t = -(line.start.dot(this.normal) + this.constant) / denominator;
if (t < 0 || t > 1) {
return null;
}
return target.copy(direction).multiplyScalar(t).add(line.start);
}
intersectsLine(line) {
// Note: this tests if a line intersects the plane, not whether it (or its end-points) are coplanar with it.
const startSign = this.distanceToPoint(line.start);
const endSign = this.distanceToPoint(line.end);
return (startSign < 0 && endSign > 0) || (endSign < 0 && startSign > 0);
}
intersectsBox(box) {
return box.intersectsPlane(this);
}
intersectsSphere(sphere) {
return sphere.intersectsPlane(this);
}
coplanarPoint(target) {
return target.copy(this.normal).multiplyScalar(-this.constant);
}
applyMatrix4(matrix, optionalNormalMatrix) {
const normalMatrix = optionalNormalMatrix || _normalMatrix.getNormalMatrix(matrix);
const referencePoint = this.coplanarPoint(_vector1).applyMatrix4(matrix);
const normal = this.normal.applyMatrix3(normalMatrix).normalize();
this.constant = -referencePoint.dot(normal);
return this;
}
translate(offset) {
this.constant -= offset.dot(this.normal);
return this;
}
equals(plane) {
return plane.normal.equals(this.normal) && plane.constant === this.constant;
}
clone() {
return new this.constructor().copy(this);
}
}
Plane.prototype.isPlane = true;
export { Plane };
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