Path2GCode Component

Overview

The Path2GCode component converts Grasshopper curves into G-code commands suitable for CNC machines, plotters, and 3D printers. It handles pen-up/pen-down movements automatically and optimizes toolpaths for smooth operation.

How It Works

Curve Processing

• Accepts curves organized in data trees (multiple toolpaths)
• Converts complex curves to polylines with adaptive sampling
• Maintains curve sequence and grouping through tree structure

G-Code Generation

• Generates standard G-code commands (G0, G1, G28, etc.)
• Automatic pen lifting between separate curves
• Configurable feed rates for drawing vs. travel moves

Motion Planning

• Optimizes travel moves between curve endpoints
• Handles Z-axis movements for pen-up/pen-down operations
• Uses invariant culture formatting for numeric precision

Inputs

• Curves (C): Tree of curves to convert to G-code
• Lift Height (H): Z-height for pen-up travel moves
• Z Down (Z): Z-height for drawing operations
• Feed Rate (F): Speed for drawing moves (mm/min)
• Travel Rate (T): Speed for travel moves (mm/min)

Outputs

• G-Code (G): Complete G-code as multiline string

Technical Features

Curve Sampling

• Automatic polyline conversion with length-based segmentation
• Maintains curve fidelity while optimizing for machine capabilities
• Handles both simple and complex curve geometries

Command Structure

G28          ; Home axes
G21          ; Set units to millimeters  
G90          ; Absolute positioning
G1 Z[lift]   ; Initial pen lift
G1 X[x] Y[y] ; Travel to start
G1 Z[down]   ; Pen down
G1 X[x] Y[y] ; Draw moves
G1 Z[lift]   ; Pen up

Precision Control

• Uses CultureInfo.InvariantCulture for consistent number formatting
• Configurable decimal precision (0.###)
• Prevents locale-specific formatting issues

Use Cases

• Converting Grasshopper designs to plotter drawings
• 2D cutting operations on CNC machines
• Artistic plotting and drawing automation
• Educational G-code learning and visualization