Watermill

A wooden undershot waterwheel dips its paddles into a flowing stream, converting the water's kinetic energy into steady rotation that historically powered a mill's grindstones. The stream surface is a displaced vertex mesh simulating flow.

• 16-paddle, 8-spoke wheel, 3-unit radius, mounted on a wooden axle frame
• Water surface uses layered sine-wave vertex displacement, not a texture
• Small splash particles spawn where paddles strike the water
• Wheel rotation speed is decoupled from but visually matched to stream flow speed