Eigendrum - Draw any shape and hear it as a real drum
Show HN: Eigendrum - Draw any shape and hear what it sounds like as a drum
Eigendrum is a web-based tool that lets you draw any shape and hear it as a real drum. It solves the eigenvalue problem for the shape's vibrations, accurately simulating the drumhead's modes and frequencies. You can strike the drum at different points, play individual modes, or even define shapes using mathematical formulas. The tool is tested against known spectra, ensuring accuracy, and includes famous isospectral drums to explore the question 'Can one hear the shape of a drum?' Everything runs locally in your browser, with no installation required.
Striking a spot drives each mode in proportion to how much that mode moves there. Hit a line where a mode stands still and you cannot excite it at all. That was not programmed in; it falls out of projecting the mallet onto the modes.