This grass patch scene node for Irrlicht is a simple way to add foliage to the built-in geomipmap terrain scene node. It works by dynamically adding blades as you approach and removing them as you retreat from a tile. The approach is fixed function, meaning it will work on very old machines and mobile platforms where geometry shaders are not supported. The magic is entirely in the performance options, you can configure it to spend minimal time rendering a patch, set draw distance and refresh rate according to the specs of your user’s machine. The wind is accomplished using Perlin noise, thanks to Asger Feldthaus.
I’m pretty proud of this node, it’s been featured in a few indie games including an online RPG. You can get the latest source from the irrExt svn repository along with the docs or download a Windows demo for your viewing pleasure.