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c3d-featurelines

Create, edit, and export Civil 3D feature lines via the API.

3|Updated Feb 17, 2026
Search Tags:#api#export#grading#civil-3d#corridor#featureline#elevations
One-click install
npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-featurelines
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: c3d-featurelines
Source: https://github.com/hebackus/c3d-api-plugin/tree/main/skills/c3d-featurelines
Command: npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-featurelines

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Civil 3D feature lines (FeatureLine and CorridorFeatureLine) are powerful but complex to create, edit, and export across grading and corridor workflows. This skill provides a centralized approach to manage feature lines from creation to export, reducing manual steps and topology issues that can arise when working across sites, baselines, and surfaces.

Core Features & Use Cases

  • Create and manage FeatureLine (grading) from polylines or lines; access CorridorFeatureLine data for corridor design
  • Edit elevations, point types, and grade information; export outputs as Polyline3d, Alignments, or Profiles
  • Integrate with Site and Baseline objects to maintain topology and reuse feature lines across projects

Quick Start

Create a feature line from an existing polyline and adjust its elevations or export it to a corridor feature line.

Frequently Asked Questions about c3d-featurelines

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I automate Civil 3D feature line creation and elevation editing?▼

Automate Civil 3D feature line workflows by using API classes to create FeatureLine objects from polylines and edit elevations, point types, and grade information using data-driven methods.

How do I export Civil 3D corridor feature lines to alignments and profiles?▼

Export CorridorFeatureLine objects by utilizing the Civil 3D API to output data as Polyline3d, Alignments, or Profiles for downstream corridor design and grading projects.

What is the best way to manage feature line topology across sites and baselines?▼

Manage feature line topology by integrating FeatureLine and CorridorFeatureLine objects with Site and Baseline collections, maintaining geometric relationships and elevations across surfaces.

Can I create Civil 3D grading feature lines from existing polylines?▼

Create grading feature lines from existing polylines or lines by accessing the Civil 3D API FeatureLine collection, enabling automated elevation assignment and site integration.

Does this approach support exporting feature lines as Polyline3d for site development?▼

Yes, the approach supports exporting feature lines as Polyline3d, Alignments, and Profiles, facilitating data reuse across site development and corridor design workflows.

Why do feature line topology issues occur when working across multiple surfaces?▼

Feature line topology issues occur due to manual steps and complex relationships between sites, baselines, and surfaces, which centralized API management resolves by maintaining data integrity.

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