手绘地形生成器

Generate a jittered point set and build a Delaunay triangulation with its dual cells. Let a brush paint elevation targets into a low-resolution constraint texture, sample it per triangle and add noise for ridges. Sort cells along the wind direction to carry humidity, dropping rainfall on upslopes, then route water downhill to accumulate flow and draw rivers whose width follows flow. Render in WebGL with an oblique projection that offsets y by elevation, colour by elevation and moisture, and add outline and hatching passes for a hand-drawn look. Keep simulation in a worker.