How do I install the C3d Class Reference skill?

Run npx skillmds@latest add hebackus/c3d-class-reference in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the C3d Class Reference skill do?

Quick reference for Civil 3D .NET API classes - instant class lookups It is listed under Integrations & APIs on SkillMD.

Is C3d Class Reference safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with C3d Class Reference?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is C3d Class Reference free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published C3d Class Reference?

hebackus (@hebackus) published this skill. Their other Agent Skills are listed on their SkillMD profile.

C3d Class Reference by hebackus — Agent Skill

Name: C3d Class Reference
Author: hebackus

File contents

Civil 3D .NET API Class Reference

Quick lookup for 959 classes across 19 namespaces

When to Use This Skill

Looking for a specific class name
Checking what classes exist in a namespace
Finding the right type for a task
Exploring available API surface

Core Namespaces (384 classes)

Autodesk.Civil.DatabaseServices

Main Civil 3D objects - Alignments, Surfaces, Profiles, Pipe Networks, etc.

Autodesk.Civil.DatabaseServices.Styles (163 classes)

Styles for all Civil 3D objects

Autodesk.Civil (241 classes)

Core types, enumerations, exceptions

Autodesk.Civil.Settings (86 classes)

Drawing and object settings

Autodesk.Civil.ApplicationServices (1 class)

Common Patterns

Get CivilDocument

using Autodesk.Civil.ApplicationServices;

CivilDocument civilDoc = CivilApplication.ActiveDocument;

Access Collections

using Autodesk.Civil.DatabaseServices;

ObjectIdCollection alignmentIds = civilDoc.GetAlignmentIds();
ObjectIdCollection surfaceIds = civilDoc.GetSurfaceIds();
ObjectIdCollection networkIds = civilDoc.GetPipeNetworkIds();
ObjectIdCollection pressureNetworkIds = civilDoc.GetPressurePipeNetworkIds();

Open Objects

using (Transaction tr = db.TransactionManager.StartTransaction())
{
    Alignment align = tr.GetObject(alignmentId, OpenMode.ForRead) as Alignment;
    Surface surf = tr.GetObject(surfaceId, OpenMode.ForRead) as Surface;

    tr.Commit();
}

Full Class Index

See api-reference/CLASS_INDEX.md for complete listing of all 959 types.

Related Skills

/c3d-api:c3d-project-setup - Setting up .NET project for Civil 3D development
/c3d-api:c3d-root-objects - CivilApplication, CivilDocument, settings hierarchy
/c3d-api:c3d-alignments - Alignment creation, entities, geometry
/c3d-api:c3d-surfaces - Surface creation, editing, data extraction
/c3d-api:c3d-profiles - Profile layout, PVIs, profile views
/c3d-api:c3d-pipe-networks - Gravity and pressure pipe network objects
/c3d-api:c3d-corridors - Corridor creation, baselines, regions
/c3d-api:c3d-points - CogoPoint, PointGroup, UDP access
/c3d-api:c3d-label-styles - LabelStyle, components, hierarchy
/c3d-api:c3d-custom-subassemblies - Subassembly SDK, CorridorState, geometry callbacks

---name: c3d-class-referencedescription: Quick reference for Civil 3D .NET API classes - instant class lookups---# Civil 3D .NET API Class Reference**Quick lookup for 959 classes across 19 namespaces**## When to Use This Skill- Looking for a specific class name- Checking what classes exist in a namespace- Finding the right type for a task- Exploring available API surface## Core Namespaces (384 classes)### Autodesk.Civil.DatabaseServices**Main Civil 3D objects** - Alignments, Surfaces, Profiles, Pipe Networks, etc.### Autodesk.Civil.DatabaseServices.Styles (163 classes)**Styles for all Civil 3D objects**### Autodesk.Civil (241 classes)**Core types, enumerations, exceptions**### Autodesk.Civil.Settings (86 classes)**Drawing and object settings**### Autodesk.Civil.ApplicationServices (1 class)## Common Patterns### Get CivilDocument```csharpusing Autodesk.Civil.ApplicationServices;CivilDocument civilDoc = CivilApplication.ActiveDocument;```### Access Collections```csharpusing Autodesk.Civil.DatabaseServices;ObjectIdCollection alignmentIds = civilDoc.GetAlignmentIds();ObjectIdCollection surfaceIds = civilDoc.GetSurfaceIds();ObjectIdCollection networkIds = civilDoc.GetPipeNetworkIds();ObjectIdCollection pressureNetworkIds = civilDoc.GetPressurePipeNetworkIds();```### Open Objects```csharpusing (Transaction tr = db.TransactionManager.StartTransaction()){ Alignment align = tr.GetObject(alignmentId, OpenMode.ForRead) as Alignment; Surface surf = tr.GetObject(surfaceId, OpenMode.ForRead) as Surface; tr.Commit();}```## Full Class IndexSee [`api-reference/CLASS_INDEX.md`](../../api-reference/CLASS_INDEX.md) for complete listing of all 959 types.## Related Skills- `/c3d-api:c3d-project-setup` - Setting up .NET project for Civil 3D development- `/c3d-api:c3d-root-objects` - CivilApplication, CivilDocument, settings hierarchy- `/c3d-api:c3d-alignments` - Alignment creation, entities, geometry- `/c3d-api:c3d-surfaces` - Surface creation, editing, data extraction- `/c3d-api:c3d-profiles` - Profile layout, PVIs, profile views- `/c3d-api:c3d-pipe-networks` - Gravity and pressure pipe network objects- `/c3d-api:c3d-corridors` - Corridor creation, baselines, regions- `/c3d-api:c3d-points` - CogoPoint, PointGroup, UDP access- `/c3d-api:c3d-label-styles` - LabelStyle, components, hierarchy- `/c3d-api:c3d-custom-subassemblies` - Subassembly SDK, CorridorState, geometry callbacks

Frequently asked questions

C3d Class Reference