c3d-grading

Automate Civil 3D grading workflows with grading groups and daylight criteria.

3|Updated Feb 17, 2026
One-click install
npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-grading
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: c3d-grading
Source: https://github.com/hebackus/c3d-api-plugin/tree/main/skills/c3d-grading
Command: npx skills add https://github.com/hebackus/c3d-api-plugin --skill c3d-grading

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Civil 3D grading is complex and time-consuming due to the need to manage grading groups, footprints, surfaces, and volumes; without a structured workflow, projects risk inconsistencies and delays.

Core Features & Use Cases

  • Create and manage grading groups linked to site objects and generate automatic surfaces.
  • Define GradingCriteria sets for daylighting, cut/fill, and volume calculations.
  • Apply feature line footprints to drive grading projections and compute volumes for site design.
  • Use cases include parking lot grading, road alignments, and landscape grading with volume validation.

Quick Start

Create a grading group for a site, add a feature line footprint, define daylight criteria, and update the grading surface.

Frequently Asked Questions about c3d-grading

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

FAQPage Schema
How do I automate Civil 3D grading workflows for parking lot site development?

Automate Civil 3D grading workflows by creating grading groups, setting daylight criteria, and generating automatic surfaces and volume calculations directly from feature line footprints.

Can I calculate cut and fill volumes from feature line footprints in Civil 3D?

Yes, calculate cut and fill volumes by applying feature line footprints to drive grading projections and compute volumes using defined GradingCriteria sets for daylighting.

Do I need Civil 3D API access to create grading groups and generate surfaces?

Yes, you need Civil 3D API access within a CivilDocument context to manage GradingGroup, Grading, and FeatureLine objects for generating surfaces and volume calculations.

What is the best way to manage grading criteria for road widening and landscape grading?

Manage grading criteria by defining GradingCriteria sets for daylighting and volume calculations, then applying feature line footprints to drive projections for road widening and landscape grading.

Does this grading automation approach work without manually managing surfaces and volumes?

Yes, it creates grading groups linked to site objects that generate automatic surfaces, eliminating the need to manually manage footprints and volume calculations for site design tasks.