# "Learning how to write a 3D soft engine from scratch in C#, TypeScript or JavaScript"

• Posted: Jun 19, 2013 at 6:00 AM
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Today's wild Wednesday project is from, David Rousset, who walks us through creating a software based 3D engine, in C#, TypeScript and JavaScript. In short pick the language that's best for you and follow along with him as he talks 3D, matrix math and code...

## Tutorial series: learning how to write a 3D soft engine from scratch in C#, TypeScript or JavaScript

I’d to like to share with you how I’ve learned to build what’s known as a “3D soft engine” through a series of tutorials. “Software engine” means that we will use only the CPU to build a 3D engine in an old school way (remember Doom on your 80386 ?). I’ll share with you the C#, TypeScript and JavaScript versions of the code. In this list, you should then find your favorite language or at least something near your favorite one. The idea is to help you transposing the following samples & concepts on your favorite platform. You’ll find the Visual Studio 2012 C#/TS/JS solutions to download at the end also.

So why building a 3D soft engine? Well, it’s simply because it really helps understanding how modern 3D works with our GPUs. Indeed, I’m currently learning the basics of 3D thanks to internal workshops delivered within Microsoft by the awesome David Catuhe. He’s been mastering 3D for many years now and matrices operations is hard-coded in his brain. When I was young, I was dreaming to be able to write such engines but I had the feeling it was too complex for me. Finally, you’ll see that this is not – that - complex. You simply need someone that will help you understanding the underlying principles in a simple way.

Through this series, you will learn how to project some 3D coordinates (X, Y, Z) associated to a point (a vertex) on a 2D screen, how to draw lines between each point, how to fill some triangles, to handle lights, materials and so on. This first tutorial will simply show you how to display 8 points associated to a cube and how to move them in a virtual 3D world.

By properly following this tutorial, you will have the following result at the end:

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## Tutorial part 2: learning how to write a 3D soft engine from scratch in C#, TS or JS – drawing lines & triangles

Now that we have built the core of our 3D engine thanks to the previous tutorial Tutorial series- learning how to write a 3D soft engine from scratch in C#, TypeScript or JavaScript, we can work on enhancing the rendering. The next step is then to connect the dots to draw some lines in order to render what you probably know as a “wireframe” rendering.

In this tutorial, you will learn how to draw lines, what a face is and how cool is the Bresenham algorithm to draw some triangles.

Thanks to that, at the end, you will know how to code something as cool as that:

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- C# : SoftEngineCSharpPart2.zip
- TypeScript : SoftEngineTSPart2.zip
- JavaScript : SoftEngineJSPart2.zip or simply right-click –> view source on the embedded iframe

In next tutorial, you will learn how to export some Meshes from Blender, a free 3D modeler tool, into a JSON format. We will then load this JSON file to display it with our wireframe engine. Indeed, we already have everything setup to display much more complex meshes like these one:

Here's a snap of the C# version (which is also a Windows Store App);

And its Project;

While not Halo, in the end, if you follow along, you'll still be one step ahead...