simsite/frontend/node_modules/three-stdlib/misc/ConvexObjectBreaker.js

import { Line3, Plane, Vector3, Mesh } from "three";
import { ConvexGeometry } from "../geometries/ConvexGeometry.js";
const _v1 = /* @__PURE__ */ new Vector3();
const ConvexObjectBreaker = /* @__PURE__ */ (() => {
  class ConvexObjectBreaker2 {
    constructor(minSizeForBreak = 1.4, smallDelta = 1e-4) {
      this.minSizeForBreak = minSizeForBreak;
      this.smallDelta = smallDelta;
      this.tempLine1 = new Line3();
      this.tempPlane1 = new Plane();
      this.tempPlane2 = new Plane();
      this.tempPlane_Cut = new Plane();
      this.tempCM1 = new Vector3();
      this.tempCM2 = new Vector3();
      this.tempVector3 = new Vector3();
      this.tempVector3_2 = new Vector3();
      this.tempVector3_3 = new Vector3();
      this.tempVector3_P0 = new Vector3();
      this.tempVector3_P1 = new Vector3();
      this.tempVector3_P2 = new Vector3();
      this.tempVector3_N0 = new Vector3();
      this.tempVector3_N1 = new Vector3();
      this.tempVector3_AB = new Vector3();
      this.tempVector3_CB = new Vector3();
      this.tempResultObjects = { object1: null, object2: null };
      this.segments = [];
      const n = 30 * 30;
      for (let i = 0; i < n; i++)
        this.segments[i] = false;
    }
    prepareBreakableObject(object, mass, velocity, angularVelocity, breakable) {
      const userData = object.userData;
      userData.mass = mass;
      userData.velocity = velocity.clone();
      userData.angularVelocity = angularVelocity.clone();
      userData.breakable = breakable;
    }
    /*
     * @param {int} maxRadialIterations Iterations for radial cuts.
     * @param {int} maxRandomIterations Max random iterations for not-radial cuts
     *
     * Returns the array of pieces
     */
    subdivideByImpact(object, pointOfImpact, normal, maxRadialIterations, maxRandomIterations) {
      const debris = [];
      const tempPlane1 = this.tempPlane1;
      const tempPlane2 = this.tempPlane2;
      this.tempVector3.addVectors(pointOfImpact, normal);
      tempPlane1.setFromCoplanarPoints(pointOfImpact, object.position, this.tempVector3);
      const maxTotalIterations = maxRandomIterations + maxRadialIterations;
      const scope = this;
      function subdivideRadial(subObject, startAngle, endAngle, numIterations) {
        if (Math.random() < numIterations * 0.05 || numIterations > maxTotalIterations) {
          debris.push(subObject);
          return;
        }
        let angle = Math.PI;
        if (numIterations === 0) {
          tempPlane2.normal.copy(tempPlane1.normal);
          tempPlane2.constant = tempPlane1.constant;
        } else {
          if (numIterations <= maxRadialIterations) {
            angle = (endAngle - startAngle) * (0.2 + 0.6 * Math.random()) + startAngle;
            scope.tempVector3_2.copy(object.position).sub(pointOfImpact).applyAxisAngle(normal, angle).add(pointOfImpact);
            tempPlane2.setFromCoplanarPoints(pointOfImpact, scope.tempVector3, scope.tempVector3_2);
          } else {
            angle = (0.5 * (numIterations & 1) + 0.2 * (2 - Math.random())) * Math.PI;
            scope.tempVector3_2.copy(pointOfImpact).sub(subObject.position).applyAxisAngle(normal, angle).add(subObject.position);
            scope.tempVector3_3.copy(normal).add(subObject.position);
            tempPlane2.setFromCoplanarPoints(subObject.position, scope.tempVector3_3, scope.tempVector3_2);
          }
        }
        scope.cutByPlane(subObject, tempPlane2, scope.tempResultObjects);
        const obj1 = scope.tempResultObjects.object1;
        const obj2 = scope.tempResultObjects.object2;
        if (obj1) {
          subdivideRadial(obj1, startAngle, angle, numIterations + 1);
        }
        if (obj2) {
          subdivideRadial(obj2, angle, endAngle, numIterations + 1);
        }
      }
      subdivideRadial(object, 0, 2 * Math.PI, 0);
      return debris;
    }
    cutByPlane(object, plane, output) {
      const geometry = object.geometry;
      const coords = geometry.attributes.position.array;
      const normals = geometry.attributes.normal.array;
      const numPoints = coords.length / 3;
      let numFaces = numPoints / 3;
      let indices = geometry.getIndex();
      if (indices) {
        indices = indices.array;
        numFaces = indices.length / 3;
      }
      function getVertexIndex(faceIdx, vert) {
        const idx = faceIdx * 3 + vert;
        return indices ? indices[idx] : idx;
      }
      const points1 = [];
      const points2 = [];
      const delta = this.smallDelta;
      const numPointPairs = numPoints * numPoints;
      for (let i = 0; i < numPointPairs; i++)
        this.segments[i] = false;
      const p0 = this.tempVector3_P0;
      const p1 = this.tempVector3_P1;
      const n0 = this.tempVector3_N0;
      const n1 = this.tempVector3_N1;
      for (let i = 0; i < numFaces - 1; i++) {
        const a1 = getVertexIndex(i, 0);
        const b1 = getVertexIndex(i, 1);
        const c1 = getVertexIndex(i, 2);
        n0.set(normals[a1], normals[a1] + 1, normals[a1] + 2);
        for (let j = i + 1; j < numFaces; j++) {
          const a2 = getVertexIndex(j, 0);
          const b2 = getVertexIndex(j, 1);
          const c2 = getVertexIndex(j, 2);
          n1.set(normals[a2], normals[a2] + 1, normals[a2] + 2);
          const coplanar = 1 - n0.dot(n1) < delta;
          if (coplanar) {
            if (a1 === a2 || a1 === b2 || a1 === c2) {
              if (b1 === a2 || b1 === b2 || b1 === c2) {
                this.segments[a1 * numPoints + b1] = true;
                this.segments[b1 * numPoints + a1] = true;
              } else {
                this.segments[c1 * numPoints + a1] = true;
                this.segments[a1 * numPoints + c1] = true;
              }
            } else if (b1 === a2 || b1 === b2 || b1 === c2) {
              this.segments[c1 * numPoints + b1] = true;
              this.segments[b1 * numPoints + c1] = true;
            }
          }
        }
      }
      const localPlane = this.tempPlane_Cut;
      object.updateMatrix();
      ConvexObjectBreaker2.transformPlaneToLocalSpace(plane, object.matrix, localPlane);
      for (let i = 0; i < numFaces; i++) {
        const va = getVertexIndex(i, 0);
        const vb = getVertexIndex(i, 1);
        const vc = getVertexIndex(i, 2);
        for (let segment = 0; segment < 3; segment++) {
          const i0 = segment === 0 ? va : segment === 1 ? vb : vc;
          const i1 = segment === 0 ? vb : segment === 1 ? vc : va;
          const segmentState = this.segments[i0 * numPoints + i1];
          if (segmentState)
            continue;
          this.segments[i0 * numPoints + i1] = true;
          this.segments[i1 * numPoints + i0] = true;
          p0.set(coords[3 * i0], coords[3 * i0 + 1], coords[3 * i0 + 2]);
          p1.set(coords[3 * i1], coords[3 * i1 + 1], coords[3 * i1 + 2]);
          let mark0 = 0;
          let d = localPlane.distanceToPoint(p0);
          if (d > delta) {
            mark0 = 2;
            points2.push(p0.clone());
          } else if (d < -delta) {
            mark0 = 1;
            points1.push(p0.clone());
          } else {
            mark0 = 3;
            points1.push(p0.clone());
            points2.push(p0.clone());
          }
          let mark1 = 0;
          d = localPlane.distanceToPoint(p1);
          if (d > delta) {
            mark1 = 2;
            points2.push(p1.clone());
          } else if (d < -delta) {
            mark1 = 1;
            points1.push(p1.clone());
          } else {
            mark1 = 3;
            points1.push(p1.clone());
            points2.push(p1.clone());
          }
          if (mark0 === 1 && mark1 === 2 || mark0 === 2 && mark1 === 1) {
            this.tempLine1.start.copy(p0);
            this.tempLine1.end.copy(p1);
            let intersection = new Vector3();
            intersection = localPlane.intersectLine(this.tempLine1, intersection);
            if (intersection === null) {
              console.error("Internal error: segment does not intersect plane.");
              output.segmentedObject1 = null;
              output.segmentedObject2 = null;
              return 0;
            }
            points1.push(intersection);
            points2.push(intersection.clone());
          }
        }
      }
      const newMass = object.userData.mass * 0.5;
      this.tempCM1.set(0, 0, 0);
      let radius1 = 0;
      const numPoints1 = points1.length;
      if (numPoints1 > 0) {
        for (let i = 0; i < numPoints1; i++)
          this.tempCM1.add(points1[i]);
        this.tempCM1.divideScalar(numPoints1);
        for (let i = 0; i < numPoints1; i++) {
          const p = points1[i];
          p.sub(this.tempCM1);
          radius1 = Math.max(radius1, p.x, p.y, p.z);
        }
        this.tempCM1.add(object.position);
      }
      this.tempCM2.set(0, 0, 0);
      let radius2 = 0;
      const numPoints2 = points2.length;
      if (numPoints2 > 0) {
        for (let i = 0; i < numPoints2; i++)
          this.tempCM2.add(points2[i]);
        this.tempCM2.divideScalar(numPoints2);
        for (let i = 0; i < numPoints2; i++) {
          const p = points2[i];
          p.sub(this.tempCM2);
          radius2 = Math.max(radius2, p.x, p.y, p.z);
        }
        this.tempCM2.add(object.position);
      }
      let object1 = null;
      let object2 = null;
      let numObjects = 0;
      if (numPoints1 > 4) {
        object1 = new Mesh(new ConvexGeometry(points1), object.material);
        object1.position.copy(this.tempCM1);
        object1.quaternion.copy(object.quaternion);
        this.prepareBreakableObject(
          object1,
          newMass,
          object.userData.velocity,
          object.userData.angularVelocity,
          2 * radius1 > this.minSizeForBreak
        );
        numObjects++;
      }
      if (numPoints2 > 4) {
        object2 = new Mesh(new ConvexGeometry(points2), object.material);
        object2.position.copy(this.tempCM2);
        object2.quaternion.copy(object.quaternion);
        this.prepareBreakableObject(
          object2,
          newMass,
          object.userData.velocity,
          object.userData.angularVelocity,
          2 * radius2 > this.minSizeForBreak
        );
        numObjects++;
      }
      output.object1 = object1;
      output.object2 = object2;
      return numObjects;
    }
    static transformFreeVector(v, m) {
      const x = v.x, y = v.y, z = v.z;
      const e = m.elements;
      v.x = e[0] * x + e[4] * y + e[8] * z;
      v.y = e[1] * x + e[5] * y + e[9] * z;
      v.z = e[2] * x + e[6] * y + e[10] * z;
      return v;
    }
    static transformFreeVectorInverse(v, m) {
      const x = v.x, y = v.y, z = v.z;
      const e = m.elements;
      v.x = e[0] * x + e[1] * y + e[2] * z;
      v.y = e[4] * x + e[5] * y + e[6] * z;
      v.z = e[8] * x + e[9] * y + e[10] * z;
      return v;
    }
    static transformTiedVectorInverse(v, m) {
      const x = v.x, y = v.y, z = v.z;
      const e = m.elements;
      v.x = e[0] * x + e[1] * y + e[2] * z - e[12];
      v.y = e[4] * x + e[5] * y + e[6] * z - e[13];
      v.z = e[8] * x + e[9] * y + e[10] * z - e[14];
      return v;
    }
    static transformPlaneToLocalSpace(plane, m, resultPlane) {
      resultPlane.normal.copy(plane.normal);
      resultPlane.constant = plane.constant;
      const referencePoint = ConvexObjectBreaker2.transformTiedVectorInverse(plane.coplanarPoint(_v1), m);
      ConvexObjectBreaker2.transformFreeVectorInverse(resultPlane.normal, m);
      resultPlane.constant = -referencePoint.dot(resultPlane.normal);
    }
  }
  return ConvexObjectBreaker2;
})();
export {
  ConvexObjectBreaker
};
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