@polygonjs/polygonjs
Version:
node-based WebGL 3D engine https://polygonjs.com
47 lines (46 loc) • 1.5 kB
JavaScript
;
import { Vector4 } from "three";
import { QuadPrimitive } from "../QuadPrimitive";
const _v4 = new Vector4();
const STRIDE = 4;
export const quadObjectFromPrimitives = (object, entities) => {
const quadObject = object;
const geometry = quadObject.geometry;
if (!geometry) {
return void 0;
}
const oldIndex = geometry.index;
if (!oldIndex) {
return void 0;
}
const oldIndexArray = [...oldIndex];
const entitiesCount = entities.length;
const newIndices = new Array(entitiesCount * STRIDE);
let i = 0;
for (const primitive of entities) {
_v4.fromArray(oldIndexArray, primitive.index() * STRIDE);
_v4.toArray(newIndices, i * STRIDE);
i++;
}
geometry.setIndex(newIndices);
const primitiveAttributes = QuadPrimitive.attributes(object);
if (primitiveAttributes) {
const primitiveAttributeNames = Object.keys(primitiveAttributes);
for (const primitiveAttributeName of primitiveAttributeNames) {
const primitiveAttribute = primitiveAttributes[primitiveAttributeName];
const itemSize = primitiveAttribute.itemSize;
const srcArray = primitiveAttribute.array;
const newArray = new Array(entitiesCount * itemSize);
let i2 = 0;
for (const entity of entities) {
const index = entity.index();
for (let k = 0; k < itemSize; k++) {
newArray[i2 + k] = srcArray[index + k];
}
i2++;
}
primitiveAttribute.array = newArray;
}
}
return quadObject;
};