opencsg-net

opencsg-net is a skill for Claude Code, Codex from znlgis/opengis-skills. It costs 82 tokens per session (1,930 once invoked), scanned A, original, MIT.

A .NET library for building 3D shapes from cubes, spheres, and cylinders, then combining or cutting them with set-like operations. CSG, or constructive solid geometry, means creating complex solids from simpler shapes.

In plain words
What is it for?
Use it in C# programs to move, rotate, scale, union, subtract, or intersect solids and export the result as an ASCII or binary STL file for 3D workflows.
Why use it?
It removes the need to implement basic solid modelling and shape-combination calculations yourself.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it in C# programs to move, rotate, scale, union, subtract, or intersect solids and export the result as an ASCII or binary STL file for 3D workflows.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/znlgis/opengis-skills/opencsg-net
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add znlgis/opengis-skills --skill opencsg-net
Clone the repo
git clone --depth 1 https://github.com/znlgis/opengis-skills

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for opencsg-net

README.md
[![agentmods](https://agentmods.dev/badge/skills/znlgis/opengis-skills/opencsg-net/github.svg)](https://agentmods.dev/skills/znlgis/opengis-skills/opencsg-net)
Your own site
<a href="https://agentmods.dev/skills/znlgis/opengis-skills/opencsg-net"><img src="https://agentmods.dev/badge/skills/znlgis/opengis-skills/opencsg-net/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for opencsg-net

Your own site · 80×15
<a href="https://agentmods.dev/skills/znlgis/opengis-skills/opencsg-net"><img src="https://agentmods.dev/badge/skills/znlgis/opengis-skills/opencsg-net.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 82 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,930 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00082 $0.01930
Opus 5 $0.00041 $0.00965
Sonnet 5 $0.00016 $0.00386
Haiku 4.5 $0.00008 $0.00193

Measured 2d ago against content hash 493be7b29726, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

opencsg-net scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

3d/opencsg-net/SKILL.md · 219 lines

How it starts

The opening of the file, as written. The whole thing — 219 lines — stays where its author put it; the contents beside it link to each section on GitHub.

项目地址: https://github.com/znlgis/OpenCSG.NET

NuGet: https://www.nuget.org/packages/OpenCSG.NET

许可证: MIT

概述

OpenCSG.NET 是一个面向 .NET 的 构造实体几何(CSG)建模库。提供基础形体(立方体、球体、圆柱体)、布尔运算(并集、差集、交集)以及 STL 文件导出。零依赖,netstandard2.0,MIT 授权

核心特性

特性 说明
零依赖 无任何外部 NuGet 依赖
跨平台 netstandard2.0,支持 .NET 6/7/8/9+
CSG 布尔运算 Union / Subtract / Intersect
基础形体 Cube / Sphere / Cylinder
变换 Translate / RotateX/Y/Z / Scale
STL 导出 ASCII + Binary 两种格式
BSP 树 迭代式 BSP 树实现(非递归)

上游关系

OpenJsCad csg.js (JavaScript)
└── praeclarum/Csg (手工 C# 移植)
    └── hypar-io/Csg
        ├── Csg (Union 原点居中修复、NaN 校验)
        └── DotNetCsg (二进制 STL、迭代 BSP、RotateX/Y/Z)
            └── OpenCSG.NET (本项目 — 合并两者改进)

环境准备

安装

dotnet add package OpenCSG.NET

前置条件

  • .NET Standard 2.0+(库本身)
  • .NET 8+(构建/测试/示例)
  • 构建解决方案需要 .NET 9+ SDK:dotnet build OpenCSG.NET.slnx

核心 API

基础形体

using Csg;
using static Csg.Solids;

// 立方体
var cube = Cube(size: 2, center: true);
var cube2 = Cube(x: 3, y: 2, z: 1);        // 自定义尺寸

// 球体
var sphere = Sphere(r: 1, center: true);

// 圆柱体
var cylinder = Cylinder(r: 0.5, h: 3, center: true);

布尔运算

// 并集
var union = Union(cube, sphere);

// 差集
var difference = cube.Subtract(sphere);

// 交集
var intersection = cube.Intersect(sphere);

变换

var transformed = cube
    .Translate(x: 5, y: 0, z: 0)
    .RotateZ(45)
    .Scale(0.5);

// 单独旋转
var rotated = cube.RotateX(30);
var rotated2 = cube.RotateY(45);
var rotated3 = cube.RotateZ(60);

STL 导出

// ASCII STL
using (var fs = File.Create("output.stl"))
using (var wr = new StreamWriter(fs))
{
    union.WriteStl("union", wr);
}

// Binary STL(更小的文件体积)
using (var fs = File.Create("output.stl"))
using (var wr = new BinaryWriter(fs))
{
    union.WriteStl("union", wr);
}

典型工作流

创建机械零件

using Csg;
using static Csg.Solids;

// 创建一个带孔的圆柱体
var cylinder = Cylinder(r: 2, h: 3, center: true);
var hole = Cylinder(r: 0.5, h: 3.1, center: true);  // 稍高确保穿透
var part = cylinder.Subtract(hole);

// 添加侧面凸台
var boss = Cylinder(r: 0.8, h: 1.5, center: true)
    .RotateY(90)
    .Translate(x: 2, y: 0, z: 0);
var result = part.Union(boss);

// 导出
using var fs = File.Create("part.stl");
using var wr = new BinaryWriter(fs);
result.WriteStl("mechanical_part", wr);

Read the full file on GitHub · 219 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 8d ago Changed 43da62d80402
  2. 12d ago First seen · 219 lines · 82 tokens per session scan A 493be7b29726

Subscribe to this mod's changes

opencsg-net is a skill published in the GitHub repository znlgis/opengis-skills (61 stars, last pushed today), licensed MIT. It adds 82 tokens to every session and 1,930 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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