Acceleration Field Simulation

This is a simple simulation of an acceleration field with a terrain based on an elevation function.

The elevation function takes three arguments: x, y and t (time). The terrain is updated every frame.

Input

• Input argument (optional): RPN of the elevation function, e.g.: "0.01 x * 0.1 y * + t * sin 0.01 y * 0.1 t * + sin +" (the default)
• Space button: freeze/unfreeze the terrain
• Left mouse button: drop a ball, the ball will follow the terrain and find a local minimum

Displayed:

• topographic map (red is high, green in the middle, blue is low)
• acceleration field (arrows pointing towards the local minimum)
• balls