Industrial Pipe Bending Simulator

A high-performance, real-time 3D simulation software for industrial CNC pipe bending machines. Built with **Rust** and the **Bevy** game engine, this project bridges the gap between low-level CAD topology analysis and real-time kinematic simulation.

🚀 Key Features

🏗️ CAD & Computational Geometry

• STEP File Import (ISO 10303): Custom implementation of a STEP parser using ruststep. Extracts complex B-Rep topology (Shells, Faces, Oriented Edges) directly from raw CAD data.
• Topology Analysis: Algorithms to recognize geometric features such as cylindrical segments and toroidal bends from NURBS/B-Spline curves.
• Automatic "Unbending" Algorithm: Mathematically analyzes bent pipe models to calculate the raw straight pipe length and generates the precise LRA (Length, Rotation, Angle) bending schedule for CNC machines.
• Adaptive Triangulation: Dynamic tessellation of curved surfaces (tori/cylinders) with adjustable segment count for optimal balance between accuracy and performance.

🏭 Physics & Kinematics Simulation

• Finite State Machine (FSM): Manages the complex lifecycle of the CNC robot, handling states like Feeding, Rotating, Bending, Clamping, and Unclamping.
• Virtual Machine Registers: A digital twin architecture that maps physical motor parameters (positions, angles, velocity) to the 3D visual representation in real-time.
• Collision-Aware Movement: Simulates the physical constraints and mechanical interactions of machine parts (mandrels, wipers, pressure dies).

🎨 Rendering & Architecture

• Bevy ECS Architecture: Highly modular design separating logic (MachineControl), rendering (PipeView), and data processing.
• Procedural Mesh Generation: Generates machine parts (rollers, dies) and deformable pipe meshes on the fly using truck_meshalgo and truck_modeling.
• Custom Shaders: Specialized WGSL shaders for technical drawing lines (LineMaterial) and auxiliary geometry.

🛠️ Tech Stack

• Language: Rust
• Engine: Bevy (ECS, Rendering)
• CAD Kernel: truck ecosystem (Topology, Meshing, Boolean operations)
• Math: cgmath, glam
• UI: bevy_egui
• Data Parsing: ruststep

🎮 Controls

The simulation features a CAD-style camera controller:

Input	Action
Right Mouse Button + Drag	Orbit / Rotate Camera
Middle Mouse Button + Drag	Pan Camera
Mouse Wheel	Zoom In / Out

🧩 Architecture Overview

The project is structured around the Entity Component System (ECS) pattern:

1. MachineRegisters Resource: Acts as the "brain" of the CNC machine, holding the current state of all axes (Y-rotation, Z-feeding, Bend Angle).
2. **`LRACLR