Accueil / npm / three@0.186.1 / src / core / InstancedBufferAttribute.js
InstancedBufferAttribute.js
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 };