Add test files for checking a rhino3dm error.

tools/sandbox/rhino3dm_error/.gitignore

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+output/*

tools/sandbox/rhino3dm_error/rhino3dm_error.js

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+let rhino3dm = require ('../../../libs/rhino3dm.min.js')
+let fs = require ('fs');
+let path = require ('path');
+
+function Write3dmFileToJson (rhino, rhinoFileName, outputFolder)
+{
+	console.log ('Writing 3dm to json: ' + outputFolder);
+	if (!fs.existsSync (outputFolder)){
+		fs.mkdirSync (outputFolder);
+	}
+	let inputBuffer = fs.readFileSync (rhinoFileName, null).buffer;
+	let inputArray = new Uint8Array (inputBuffer);
+	let inputDoc = rhino.File3dm.fromByteArray (inputArray);
+	let objects = inputDoc.objects ();
+	for (let i = 0; i < objects.count; i++) {
+		let mesh = objects.get (i).geometry ();
+		if (mesh instanceof rhino.Mesh) {
+			let threeJson = mesh.toThreejsJSON ();
+			let jsonFileName = path.join (outputFolder, 'mesh' + i + '.json');
+			fs.writeFileSync (jsonFileName, JSON.stringify (threeJson, null, 4));
+		}
+	}
+}
+
+function WriteJsonTo3dmFile (rhino, inputFolder)
+{
+	console.log ('Writing json to 3dm: ' + inputFolder);
+	let outputDoc = new rhino.File3dm ();
+	let fileNames = fs.readdirSync (inputFolder);
+	for (let i = 0; i < fileNames.length; i++) {
+		let fileName = fileNames[i];
+		if (path.extname (fileName) != '.json') {
+			continue;
+		}
+		let filePath = path.join (inputFolder, fileName);
+		let fileContent = fs.readFileSync (filePath);
+		let jsonContent = JSON.parse (fileContent);
+		let rhinoMesh = new rhino.Mesh.createFromThreejsJSON (jsonContent);
+		outputDoc.objects ().add (rhinoMesh, null);
+	}
+	let writeOptions = new rhino.File3dmWriteOptions ();
+	writeOptions.version = 6;
+	let outputBuffer = outputDoc.toByteArray (writeOptions);
+	fs.writeFileSync (path.join (inputFolder, 'model.3dm'), outputBuffer);
+}
+
+if (!fs.existsSync ('output')){
+	fs.mkdirSync ('output');
+}
+
+rhino3dm ().then (async function (rhinoIn) {
+	Write3dmFileToJson (rhinoIn, 'input/hello_mesh.3dm', 'output/hello_mesh');
+	Write3dmFileToJson (rhinoIn, 'input/one_cube.3dm', 'output/one_cube');
+	Write3dmFileToJson (rhinoIn, 'input/two_cubes.3dm', 'output/two_cubes');
+	Write3dmFileToJson (rhinoIn, 'input/three_cubes.3dm', 'output/three_cubes');
+	rhino3dm ().then (async function (rhinoOut) {
+		WriteJsonTo3dmFile (rhinoOut, 'output/hello_mesh');
+		WriteJsonTo3dmFile (rhinoOut, 'output/one_cube');
+		WriteJsonTo3dmFile (rhinoOut, 'output/two_cubes');
+		WriteJsonTo3dmFile (rhinoOut, 'output/three_cubes');
+	});
+});