Task 454: .NOFF File Format
Task 454: .NOFF File Format
1. List of all the properties of this file format intrinsic to its file system
The .NOFF file format is a variant of the OFF (Object File Format) used for 3D geometry, specifically including per-vertex normals. It is an ASCII-based format for representing polygonal meshes, with the following intrinsic properties based on its structure:
- Header (magic string): The string "NOFF" indicating the format variant with normals.
- Number of vertices (NV): An integer specifying the total number of vertices in the mesh.
- Number of faces (NF): An integer specifying the total number of faces in the mesh.
- Number of edges (NE): An integer specifying the total number of edges in the mesh (often set to 0 as it is not strictly used or validated in many implementations).
- Vertex coordinates: A list of NV sets of three floating-point numbers (x, y, z) representing the position of each vertex.
- Vertex normals: A list of NV sets of three floating-point numbers (nx, ny, nz) representing the normal vector for each vertex.
- Face vertex counts: A list of NF integers, each indicating the number of vertices (degree) for that face.
- Face vertex indices: For each face, a list of integers referencing the vertex indices (0-based) that form the face.
The format is typically ASCII, with data separated by spaces or newlines, and no byte order issues since it is text-based. Optional extensions in some implementations may include per-face colors, but the core .NOFF spec does not require them. The file system intrinsic aspects include being a plain text file with no compression, no encryption, and no embedded metadata beyond the structure described.
2. Two direct download links for files of format .NOFF
Despite extensive searches across web, X, and specific repositories (including GitHub, geometry sites, and 3D model databases), no direct download links for files specifically with the .noff extension or NOFF header were found. The format is obscure and rarely used in public datasets; most 3D models use the standard OFF (.off) format without normals or other variants like OBJ or PLY. For reference, here are two direct links to .off files that could be modified to NOFF by adding normals and changing the header (as examples of similar formats):
- https://people.sc.fsu.edu/~jburkardt/data/off/cube.off
- https://people.sc.fsu.edu/~jburkardt/data/off/teapot.off
3. Ghost blog embedded HTML JavaScript for drag and drop .NOFF file dump
Here is a complete HTML page with embedded JavaScript that can be embedded in a Ghost blog (or any HTML-supported blog). It allows dragging and dropping a .NOFF file, parses it, and dumps all properties to the screen.
Drag and drop a .NOFF file here
4. Python class for .NOFF file handling
class NOFFFile:
def __init__(self, filename=None):
self.header = 'NOFF'
self.nv = 0
self.nf = 0
self.ne = 0
self.vertices = []
self.normals = []
self.faces = []
if filename:
self.read(filename)
def read(self, filename):
with open(filename, 'r') as f:
lines = f.readlines()
lines = [line.strip() for line in lines if line.strip()]
index = 0
self.header = lines[index]
if self.header != 'NOFF':
raise ValueError('Invalid NOFF file: Missing or incorrect header.')
index += 1
meta = list(map(int, lines[index].split()))
self.nv, self.nf, self.ne = meta
index += 1
self.vertices = []
self.normals = []
for _ in range(self.nv):
parts = list(map(float, lines[index].split()))
self.vertices.append(parts[:3])
self.normals.append(parts[3:])
index += 1
self.faces = []
for _ in range(self.nf):
parts = list(map(int, lines[index].split()))
count = parts[0]
self.faces.append(parts[1:count + 1])
index += 1
def write(self, filename):
with open(filename, 'w') as f:
f.write(self.header + '\n')
f.write(f'{self.nv} {self.nf} {self.ne}\n')
for i in range(self.nv):
v = ' '.join(map(str, self.vertices[i]))
n = ' '.join(map(str, self.normals[i]))
f.write(f'{v} {n}\n')
for face in self.faces:
f.write(f'{len(face)} ' + ' '.join(map(str, face)) + '\n')
def print_properties(self):
print(f'Header: {self.header}')
print(f'Number of vertices: {self.nv}')
print(f'Number of faces: {self.nf}')
print(f'Number of edges: {self.ne}')
print(f'Vertex coordinates: {self.vertices}')
print(f'Vertex normals: {self.normals}')
print('Face vertex counts and indices:')
for i, face in enumerate(self.faces):
print(f'Face {i}: count={len(face)}, indices={face}')
5. Java class for .NOFF file handling
import java.io.*;
import java.util.*;
public class NOFFFile {
private String header = "NOFF";
private int nv = 0;
private int nf = 0;
private int ne = 0;
private List<float[]> vertices = new ArrayList<>();
private List<float[]> normals = new ArrayList<>();
private List<int[]> faces = new ArrayList<>();
public NOFFFile(String filename) throws IOException {
read(filename);
}
public NOFFFile() {}
public void read(String filename) throws IOException {
try (BufferedReader reader = new BufferedReader(new FileReader(filename))) {
String line;
List<String> lines = new ArrayList<>();
while ((line = reader.readLine()) != null) {
line = line.trim();
if (!line.isEmpty()) lines.add(line);
}
int index = 0;
header = lines.get(index++);
if (!header.equals("NOFF")) {
throw new IOException("Invalid NOFF file: Missing or incorrect header.");
}
String[] meta = lines.get(index++).split("\\s+");
nv = Integer.parseInt(meta[0]);
nf = Integer.parseInt(meta[1]);
ne = Integer.parseInt(meta[2]);
vertices.clear();
normals.clear();
for (int i = 0; i < nv; i++) {
String[] parts = lines.get(index++).split("\\s+");
float[] v = new float[3];
float[] n = new float[3];
for (int j = 0; j < 3; j++) v[j] = Float.parseFloat(parts[j]);
for (int j = 0; j < 3; j++) n[j] = Float.parseFloat(parts[j + 3]);
vertices.add(v);
normals.add(n);
}
faces.clear();
for (int i = 0; i < nf; i++) {
String[] parts = lines.get(index++).split("\\s+");
int count = Integer.parseInt(parts[0]);
int[] face = new int[count];
for (int j = 0; j < count; j++) face[j] = Integer.parseInt(parts[j + 1]);
faces.add(face);
}
}
}
public void write(String filename) throws IOException {
try (PrintWriter writer = new PrintWriter(filename)) {
writer.println(header);
writer.println(nv + " " + nf + " " + ne);
for (int i = 0; i < nv; i++) {
float[] v = vertices.get(i);
float[] n = normals.get(i);
writer.println(v[0] + " " + v[1] + " " + v[2] + " " + n[0] + " " + n[1] + " " + n[2]);
}
for (int[] face : faces) {
writer.print(face.length);
for (int idx : face) writer.print(" " + idx);
writer.println();
}
}
}
public void printProperties() {
System.out.println("Header: " + header);
System.out.println("Number of vertices: " + nv);
System.out.println("Number of faces: " + nf);
System.out.println("Number of edges: " + ne);
System.out.println("Vertex coordinates: " + Arrays.deepToString(vertices.toArray()));
System.out.println("Vertex normals: " + Arrays.deepToString(normals.toArray()));
System.out.println("Face vertex counts and indices:");
for (int i = 0; i < faces.size(); i++) {
int[] face = faces.get(i);
System.out.println("Face " + i + ": count=" + face.length + ", indices=" + Arrays.toString(face));
}
}
}
6. JavaScript class for .NOFF file handling
class NOFFFile {
constructor(filename = null) {
this.header = 'NOFF';
this.nv = 0;
this.nf = 0;
this.ne = 0;
this.vertices = [];
this.normals = [];
this.faces = [];
if (filename) {
this.read(filename);
}
}
async read(filename) {
const response = await fetch(filename);
const content = await response.text();
const lines = content.trim().split('\n').map(line => line.trim()).filter(line => line);
let index = 0;
this.header = lines[index++];
if (this.header !== 'NOFF') {
throw new Error('Invalid NOFF file: Missing or incorrect header.');
}
const meta = lines[index++].split(/\s+/).map(Number);
this.nv = meta[0];
this.nf = meta[1];
this.ne = meta[2];
this.vertices = [];
this.normals = [];
for (let i = 0; i < this.nv; i++) {
const parts = lines[index++].split(/\s+/).map(Number);
this.vertices.push(parts.slice(0, 3));
this.normals.push(parts.slice(3, 6));
}
this.faces = [];
for (let i = 0; i < this.nf; i++) {
const parts = lines[index++].split(/\s+/).map(Number);
const count = parts[0];
this.faces.push(parts.slice(1, count + 1));
}
}
write() {
let data = this.header + '\n';
data += `${this.nv} ${this.nf} ${this.ne}\n`;
for (let i = 0; i < this.nv; i++) {
const v = this.vertices[i].join(' ');
const n = this.normals[i].join(' ');
data += `${v} ${n}\n`;
}
for (const face of this.faces) {
data += `${face.length} ${face.join(' ')}\n`;
}
// For writing, you can use Blob to download or console.log for demo
console.log('Written data:\n' + data);
// Example: const blob = new Blob([data], {type: 'text/plain'}); URL.createObjectURL(blob);
return data;
}
printProperties() {
console.log(`Header: ${this.header}`);
console.log(`Number of vertices: ${this.nv}`);
console.log(`Number of faces: ${this.nf}`);
console.log(`Number of edges: ${this.ne}`);
console.log(`Vertex coordinates: ${JSON.stringify(this.vertices)}`);
console.log(`Vertex normals: ${JSON.stringify(this.normals)}`);
console.log('Face vertex counts and indices:');
this.faces.forEach((face, idx) => {
console.log(`Face ${idx}: count=${face.length}, indices=${face}`);
});
}
}
7. C class for .NOFF file handling
Since C does not have built-in classes, this is implemented in C++ using a class with similar functionality.
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <sstream>
class NOFFFile {
private:
std::string header = "NOFF";
int nv = 0;
int nf = 0;
int ne = 0;
std::vector<std::vector<float>> vertices;
std::vector<std::vector<float>> normals;
std::vector<std::vector<int>> faces;
public:
NOFFFile(const std::string& filename = "") {
if (!filename.empty()) {
read(filename);
}
}
void read(const std::string& filename) {
std::ifstream file(filename);
if (!file.is_open()) {
std::cerr << "Unable to open file: " << filename << std::endl;
return;
}
std::vector<std::string> lines;
std::string line;
while (std::getline(file, line)) {
line.erase(0, line.find_first_not_of(" \t"));
line.erase(line.find_last_not_of(" \t") + 1);
if (!line.empty()) lines.push_back(line);
}
file.close();
size_t index = 0;
header = lines[index++];
if (header != "NOFF") {
std::cerr << "Invalid NOFF file: Missing or incorrect header." << std::endl;
return;
}
std::istringstream meta(lines[index++]);
meta >> nv >> nf >> ne;
vertices.clear();
normals.clear();
vertices.resize(nv, std::vector<float>(3));
normals.resize(nv, std::vector<float>(3));
for (int i = 0; i < nv; ++i) {
std::istringstream vertLine(lines[index++]);
vertLine >> vertices[i][0] >> vertices[i][1] >> vertices[i][2]
>> normals[i][0] >> normals[i][1] >> normals[i][2];
}
faces.clear();
for (int i = 0; i < nf; ++i) {
std::istringstream faceLine(lines[index++]);
int count;
faceLine >> count;
std::vector<int> face(count);
for (int j = 0; j < count; ++j) {
faceLine >> face[j];
}
faces.push_back(face);
}
}
void write(const std::string& filename) {
std::ofstream file(filename);
if (!file.is_open()) {
std::cerr << "Unable to open file for writing: " << filename << std::endl;
return;
}
file << header << std::endl;
file << nv << " " << nf << " " << ne << std::endl;
for (int i = 0; i < nv; ++i) {
file << vertices[i][0] << " " << vertices[i][1] << " " << vertices[i][2] << " "
<< normals[i][0] << " " << normals[i][1] << " " << normals[i][2] << std::endl;
}
for (const auto& face : faces) {
file << face.size();
for (int idx : face) {
file << " " << idx;
}
file << std::endl;
}
file.close();
}
void printProperties() {
std::cout << "Header: " << header << std::endl;
std::cout << "Number of vertices: " << nv << std::endl;
std::cout << "Number of faces: " << nf << std::endl;
std::cout << "Number of edges: " << ne << std::endl;
std::cout << "Vertex coordinates:" << std::endl;
for (const auto& v : vertices) {
std::cout << "[" << v[0] << ", " << v[1] << ", " << v[2] << "]" << std::endl;
}
std::cout << "Vertex normals:" << std::endl;
for (const auto& n : normals) {
std::cout << "[" << n[0] << ", " << n[1] << ", " << n[2] << "]" << std::endl;
}
std::cout << "Face vertex counts and indices:" << std::endl;
for (size_t i = 0; i < faces.size(); ++i) {
std::cout << "Face " << i << ": count=" << faces[i].size() << ", indices=[";
for (size_t j = 0; j < faces[i].size(); ++j) {
std::cout << faces[i][j];
if (j < faces[i].size() - 1) std::cout << ", ";
}
std::cout << "]" << std::endl;
}
}
};