Creating SDF Fonts For Daggerfall Unity

Introduction

All the way back in September, I upgraded font rendering in Daggerfall Unity to support Signed Distance Field (SDF) fonts. This enabled smooth high-resolution font replacements which can operate under the same “layout rules” as classic Daggerfall’s pixel fonts, with a substantial improvement to reading comfort as this comparison screenshot demonstrates.

 

Rather than storing individual display pixels of a text glpyh, SDF fonts store a distance value that can be turned into display pixels later at any resolution using a custom graphics shader. Unlike regular pixel fonts that become quite pixelated at high resolutions, SDF text can use those distance values to generate sharp detail even at UHD resolutions and beyond. If you’re interested in the inner workings of Signed Distance Fields, there are loads of great resources out on the web.┬áThis tutorial doesn’t look very deeply at SDF concepts, only the process of creating new SDF fonts for Daggerfall Unity.

 

Resources

There are a few resources you will need to work through this tutorial.

You can use whatever font or tools you like to generate your SDF font atlas. This is just the process I’m using that will generate known-good output for Daggerfall Unity. If you do use a different toolchain, the only thing that matters is the output image is a proper SDF texture and the glyphs are laid out in a specific way.

 

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