Question 1

What is a URDF file and how do I generate one with AI?

Accepted Answer

URDF (Unified Robot Description Format) is an XML format used in ROS and Isaac Sim to describe a robot's kinematic chain, joints, links, inertials, and collision meshes. Robosynx lets you generate a complete, physics-correct URDF file from a plain-English description in seconds — no manual XML editing required.

Question 2

How do I convert URDF to SDF or MJCF online?

Accepted Answer

Paste your URDF into Robosynx's Format Converter, choose your target format (SDF for Gazebo or MJCF for MuJoCo), and click Convert. The Claude AI backend performs a lossless conversion preserving masses, inertias, joint limits, and the full kinematic chain.

Question 3

What is MJCF and how is it different from URDF?

Accepted Answer

MJCF (MuJoCo's XML format) is the native robot description format for MuJoCo and Isaac Lab. Unlike URDF, MJCF supports tendons, actuator models, contact parameters, and is more expressive for reinforcement learning tasks. Robosynx can convert URDF ↔ MJCF instantly.

Question 4

How do I validate a URDF or MJCF file for physics correctness?

Accepted Answer

Upload your robot file to Robosynx's Physics Validator. It runs 15+ checks including XML structure, link/joint reference integrity, positive definite inertia tensors, realistic mass distribution, and joint limit sanity — then gives you a quality score and actionable fix suggestions.

Question 5

Can I use Robosynx with Isaac Sim, Gazebo, MuJoCo, or ROS2?

Accepted Answer

Yes. Robosynx generates and converts files that are directly compatible with NVIDIA Isaac Sim (URDF/SDF), Gazebo Classic and Gazebo Harmonic (SDF), MuJoCo (MJCF), and all ROS2 URDF-based workflows. Outputs include the correct format tags, plugin references, and physics parameters for each simulator.

Question 6

Is Robosynx free to use?

Accepted Answer

Yes. Robosynx is completely free to use with no signup required. All tools — the AI robot generator, format converter, physics validator, and 3D viewer — are available without an account.

URDF ↔ SDF ↔ MJCF Format Converter — Lossless Robot File Conversion