Title: Generative Terrain — Ridge and Valley Engine
Creative prompt: Build a reproducible mountain survey desk where every seed regrows the same range in moss, clay, and survey blue. Carve rivers, paint rain, and march hikers along the ridge trail. It should feel cartographic, earthy, and explorable.
Design description: A shadowed survey-desk header frames an instruction column (biome buttons, relief/river/seed sliders, legend, live info) beside a quadrant canvas with contour lines, dashed marching-ants trail, and hiker dots; three explainer cards close the desk.
Major visual techniques:
- Canvas seeded value-noise height field with biome transforms and river carving
- Marching-ants dashed trail via animated lineDashOffset, contour tracing
- Hard offset print shadows, mismatched card radii, legend swatches
Interaction model: Reroll or seed slider rebuilds identical ranges per number; biome buttons reshape height math; relief/river sliders recarve live; pointer paints rain lakes and surveys altitude; send-hikers marches dots along the mid-contour.