@openhps/core/dist/esm/three/core/InstancedBufferAttribute.js

Open Hybrid Positioning System - Core component

import { BufferAttribute } from './BufferAttribute.js';

/**
 * An instanced version of a buffer attribute.
 *
 * @augments BufferAttribute
 */
class InstancedBufferAttribute extends BufferAttribute {
  /**
   * Constructs a new instanced buffer attribute.
   *
   * @param {TypedArray} array - The array holding the attribute data.
   * @param {number} itemSize - The item size.
   * @param {boolean} [normalized=false] - Whether the data are normalized or not.
   * @param {number} [meshPerAttribute=1] - How often a value of this buffer attribute should be repeated.
   */
  constructor(array, itemSize, normalized, meshPerAttribute = 1) {
    super(array, itemSize, normalized);

    /**
     * This flag can be used for type testing.
     *
     * @type {boolean}
     * @readonly
     * @default true
     */
    this.isInstancedBufferAttribute = true;

    /**
     * Defines how often a value of this buffer attribute should be repeated. A
     * value of one means that each value of the instanced attribute is used for
     * a single instance. A value of two means that each value is used for two
     * consecutive instances (and so on).
     *
     * @type {number}
     * @default 1
     */
    this.meshPerAttribute = meshPerAttribute;
  }
  copy(source) {
    super.copy(source);
    this.meshPerAttribute = source.meshPerAttribute;
    return this;
  }
  toJSON() {
    const data = super.toJSON();
    data.meshPerAttribute = this.meshPerAttribute;
    data.isInstancedBufferAttribute = true;
    return data;
  }
}
export { InstancedBufferAttribute };