@loaders.gl/obj/dist/lib/parse-obj.js

Framework-independent loader for the OBJ format

import { getMeshBoundingBox } from '@loaders.gl/schema';
import { parseOBJMeshes } from "./parse-obj-meshes.js";
import { getOBJSchema } from "./get-obj-schema.js";
export function parseOBJ(text, options) {
    const { meshes } = parseOBJMeshes(text);
    // @ts-expect-error
    const vertexCount = meshes.reduce((s, mesh) => s + mesh.header.vertexCount, 0);
    // TODO - render objects separately
    const attributes = mergeAttributes(meshes, vertexCount);
    const header = {
        vertexCount,
        // @ts-ignore Need to export Attributes type
        boundingBox: getMeshBoundingBox(attributes)
    };
    const schema = getOBJSchema(attributes, {
        mode: 4,
        boundingBox: header.boundingBox
    });
    return {
        // Data return by this loader implementation
        loaderData: {
            header: {}
        },
        // Normalised data
        schema,
        header,
        mode: 4, // TRIANGLES
        topology: 'point-list',
        attributes
    };
}
// eslint-disable-next-line max-statements
function mergeAttributes(meshes, vertexCount) {
    const positions = new Float32Array(vertexCount * 3);
    let normals;
    let colors;
    let uvs;
    let i = 0;
    for (const mesh of meshes) {
        const { POSITION, NORMAL, COLOR_0, TEXCOORD_0 } = mesh.attributes;
        positions.set(POSITION.value, i * 3);
        if (NORMAL) {
            normals = normals || new Float32Array(vertexCount * 3);
            normals.set(NORMAL.value, i * 3);
        }
        if (COLOR_0) {
            colors = colors || new Float32Array(vertexCount * 3);
            colors.set(COLOR_0.value, i * 3);
        }
        if (TEXCOORD_0) {
            uvs = uvs || new Float32Array(vertexCount * 2);
            uvs.set(TEXCOORD_0.value, i * 2);
        }
        i += POSITION.value.length / 3;
    }
    const attributes = {};
    attributes.POSITION = { value: positions, size: 3 };
    if (normals) {
        attributes.NORMAL = { value: normals, size: 3 };
    }
    if (colors) {
        attributes.COLOR_0 = { value: colors, size: 3 };
    }
    if (uvs) {
        attributes.TEXCOORD_0 = { value: uvs, size: 2 };
    }
    return attributes;
}