Welcome to my blog! I’m Karl, a researcher, teacher and activist somewhere at the intersection of landscape perception, graphics programming, open source, and climate change. I teach programming and game development at the HTL Spengergasse and research landscape perception and visualization at the BOKU. Here you’ll find posts around these topics.
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Godot Shader for Beginners: Lightning Strike Effect using step and smoothstep
In this post we’ll go through the process of making a simple lightning VFX using a shader, from conception to implementation. In the process, we’ll learn about step() and smoothstep, both very important and popular functions to achieve all kinds of effects in shaders, as well as (Signed) Distance Fields, which sound intimidating but are really quite simple. First, let’s think about what kind of effect we want to achieve. A lightning strike mainly consists of a bright, thin line....
Introduction to Shaders
Overview Shaders are everywhere, but these days you rarely have to write them yourself. Game engines come with a multitude of shaders which do everything from moving objects, scaling and rotating them, to coloring and texturing them, calculating lighting (perhaps using a physically-based rendering approach), and applying post-processing effects like bloom or HDR. But sometimes these built-in features are not enough: perhaps you’re going for a certain lighting aesthetic, want to create a unqiue special effect, or just need to improve the rendering performance....