"use strict";
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const THREE = require("three");
const _shadowMatrix = /* @__PURE__ */ new THREE.Matrix4();
class ShadowMesh extends THREE.Mesh {
  constructor(mesh) {
    const shadowMaterial = new THREE.MeshBasicMaterial({
      color: 0,
      transparent: true,
      opacity: 0.6,
      depthWrite: false,
      stencilWrite: true,
      stencilFunc: THREE.EqualStencilFunc,
      stencilRef: 0,
      stencilZPass: THREE.IncrementStencilOp
    });
    super(mesh.geometry, shadowMaterial);
    this.isShadowMesh = true;
    this.meshMatrix = mesh.matrixWorld;
    this.frustumCulled = false;
    this.matrixAutoUpdate = false;
  }
  update(plane, lightPosition4D) {
    const dot = plane.normal.x * lightPosition4D.x + plane.normal.y * lightPosition4D.y + plane.normal.z * lightPosition4D.z + -plane.constant * lightPosition4D.w;
    const sme = _shadowMatrix.elements;
    sme[0] = dot - lightPosition4D.x * plane.normal.x;
    sme[4] = -lightPosition4D.x * plane.normal.y;
    sme[8] = -lightPosition4D.x * plane.normal.z;
    sme[12] = -lightPosition4D.x * -plane.constant;
    sme[1] = -lightPosition4D.y * plane.normal.x;
    sme[5] = dot - lightPosition4D.y * plane.normal.y;
    sme[9] = -lightPosition4D.y * plane.normal.z;
    sme[13] = -lightPosition4D.y * -plane.constant;
    sme[2] = -lightPosition4D.z * plane.normal.x;
    sme[6] = -lightPosition4D.z * plane.normal.y;
    sme[10] = dot - lightPosition4D.z * plane.normal.z;
    sme[14] = -lightPosition4D.z * -plane.constant;
    sme[3] = -lightPosition4D.w * plane.normal.x;
    sme[7] = -lightPosition4D.w * plane.normal.y;
    sme[11] = -lightPosition4D.w * plane.normal.z;
    sme[15] = dot - lightPosition4D.w * -plane.constant;
    this.matrix.multiplyMatrices(_shadowMatrix, this.meshMatrix);
  }
}
exports.ShadowMesh = ShadowMesh;
//# sourceMappingURL=ShadowMesh.cjs.map