Open Source C# 3D Rendering Software

The Irrlicht Engine is an open source high performance realtime 3D engine written and usable in C++. It is completely cross-platform, using D3D, OpenGL and its own software renderers.

glTFast enables use of glTF™ (GL Transmission Format) asset files in Unity. It focuses on speed, memory efficiency, and a small build footprint while also providing 100% glTF 2.0 specification compliance. glTFast supports the full glTF 2.0 specification and many extensions. It works with Universal, High Definition, and Built-In Render Pipelines on all platforms. Move or copy glTF files into your project's Assets folder, similar to other 3D formats. glTFast uses custom shader graphs that you have to include in builds in order to make materials work. If materials are fine in the Unity Editor but not in builds, chances are some shaders (or variants) are missing.

NaroCAD is a fully fledged and extensible 3D parametric modeling CAD application. It is based on OpenCascade.

Open-source, cross-platform 3D rendering engine for .NET and Mono. The Axiom Engine is a high-performance C# port of the powerful OGRE engine and provides full support for DirectX, OpenGL and XNA on Windows, Linux, Android, iPhone and Windows Phone.

GLTF/GLB Windows Shell Extension: This shell extension automatically adds thumbnail images to .glb files in Windows File Explorer and provides a right click menu option to generate a 3D preview image for .gltf files. Supports multi-file select and directory processing. Pre-built Windows x64 installer available at https://buymeacoffee.com/nathancrews/e/255640 LAS/LAZ Pointcloud Windows Shell Extension: This "quick viewer" shell extension provides a Windows File Explorer right click menu option to quickly generate 3D preview images for large and small .las and .laz files. (Disclaimer: Processing time depends on compute hardware) Typical processing time for 100mb .las is about 2 seconds. 25mb .laz file process in about the same times. Files are processed in parallel using available CPU cores. Pre-built Windows x64 installer available at https://buymeacoffee.com/nathancrews/e/255641

OpenArena is a 3d game creation engine. It is a rendering system that can be used for more than just games but it is targeted at games. The basic use being create some game media textures models maps and config files for physics and rules.

As of 2012-10-02, the well-known Tao project became officially abandoned and superseded by another project called OpenTK. However, since OpenTK follows a different way than Tao did, this project tries to carry on with the original design and ideas, but with cutting edge features. The ultimate goal is to have a 1:1 OpenGL binding for .NET, which supports OpenGL 4.x. The project tries to keep as much of the original goals as possible, including licensing, etc.

The first 3D game engine built in C# for .NET, predecessor to the Visual3D Game Engine (https://www.poweraccess.net/visual3d-game-engine), an All-in-One Game Development Tool for Next-Gen 3D Games, MMOs, Simulations and Virtual Worlds powered by Microsoft XNA.

MaxDream is a cross-platform open source game(/simulation) framework based on OpenGL and GObject. MaxDream aims to be compatible with any game techniques, so you can use MaxDream, without changing your OpenGL methodology.

A tool for finding missing or corrupt images in a sequence. Also generates basic statistics from Exif data. Targeting time-lapse and render-farm users when using post-processing tools such as After Effects.

VTK.NET is a .NET wrapper for the Visualization Toolkit. With it, you can write Windows Forms applications in C#, managed C++, Visual Basic, or J#. It includes a Windows Forms Control for drag and drop design of forms.

ClutterFlow is a CoverFlow clone for the Banshee media player. ClutterFlow uses the Clutter toolkit to harness the OpenGL powers. For more info: http://gitorious.org/banshee-community-extensions/pages/ClutterFlow

ColladaLoader is a free open source C# Library that enables developers to load and display Collada 3D Model files (.DAE) in DirectX 10 using the SlimDX SDK. Partitial .X file support. More info: http://www.tomsdevshack.be/projects/colladaloader

Spark3D - A simple C#.net graphics engine, providing a base for managed 3D rendering.

CsGL is OpenGL for the .Net Framework, providing support for OpenGL 1.1 - 1.4 and numerous extensions.

2licht's aim is to provide a collection of wrappers for the popular Irrlicht Engine (http://irrlicht.sf.net/). It is still in development; the first wrappers to be released will be the C and Object Pascal interface; followed by a .NET library.

This was going to be a 3D CRPG written in c++, now it will probably be some sort of CRPG written in C# with DriectX 9.

CamelotSharp is a realtime packet analyser / parser for the game Dark Age Of Camelot.

A 3D graphics engine for use in 3D games and other real-time rendering applications using managed code (C#) and the .NET framework and supporting both the OpenGL and Direct3D APIs

A cross-platform terrain rendering engine that uses advanced techniques such as dynamic tessellation to render complex landscapes at high frame rates. Suitable for use in games, engineering, simulation, etc.

Icarus Scene Engine is a cross-platform, CLS-compliant 3D framework, integrating open source APIs into a cohesive all-open-source, all .NET solution. For Windows, MacOSX & Linux. Uses OpenTK, OpenGL, OpenAL APIs for graphics and audio. Runs on Mono/.NET. Links to FFMpeg for streaming video, and FreeType as a temporary conversion mod to bring fonts into a native XML format. Binary builds of Icarus will be infrequent, roughly every 18 months or so, the GIT code updates regularly on a weekly or twice-weekly basis (or faster if there are urgent issues).

The OpenSource Metaverse Project allows anyone to create and publish their own three dimensional virtual world, such as an MMORPG, a social virtual world, or a metaverse. New forums: http://manageddreams.com/osmpbb

a 3D game development framework base on Microsoft XNA. it contains game level editor, 3d model exporters and some other tools which is helpful to create a 3d interactive game^^ (Moved to CodePlex)

UPDATE 2014-06-01: As there are still lots of weekly downloads I need to clarify the TXna status. The Xna 3.1 based version is no longer developed, there are no commits for over two years. Instead a port to MonoGame is in progress. Please use the TXnaGE from the \branches\monogame folder! The monogame version is based on mongame 3.2.2 and has most of TXna features except: shadowmapping, modelscenenodes and instancing - those features are in development! Titanium Xna Game Engine is a Xna 3.1 based game engine written in c#. Complex scenes can be build in just few lines of code. The developer is free to combine TXna features and standard Xna techniques without any limitations. Please use the svn checkout or update feature to get the latest source and compile from source. The engine is not released frequently but only after major source updates. Chances are that by downloading a release you will get a rather old copy.