@loaders.gl/obj/dist/lib/get-obj-schema.js

Framework-independent loader for the OBJ format

// loaders.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { getDataTypeFromArray } from '@loaders.gl/schema-utils';
/** Get Mesh Schema */
export function getOBJSchema(attributes, metadata = {}) {
    const stringMetadata = {};
    for (const key in metadata) {
        if (key !== 'value') {
            stringMetadata[key] = JSON.stringify(metadata[key]);
        }
    }
    const fields = [];
    for (const attributeName in attributes) {
        const attribute = attributes[attributeName];
        const field = getFieldFromAttribute(attributeName, attribute);
        fields.push(field);
    }
    return { fields, metadata: stringMetadata };
}
/** Get a Field describing the column from an OBJ attribute */
function getFieldFromAttribute(name, attribute) {
    const metadata = {};
    for (const key in attribute) {
        if (key !== 'value') {
            metadata[key] = JSON.stringify(attribute[key]);
        }
    }
    let { type } = getDataTypeFromArray(attribute.value);
    const isSingleValue = attribute.size === 1 || attribute.size === undefined;
    if (!isSingleValue) {
        type = { type: 'fixed-size-list', listSize: attribute.size, children: [{ name: 'values', type }] };
    }
    return { name, type, nullable: false, metadata };
}
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