Move over, metaballs, there's a new kid in town

Now I need to compare/contrast to perlin noise + contours...

This is the "linear binning" branch of d3-contour https://github.com/d3/d3-contour/pull/46

💖 that you just pulled in Harry's implementation. 😂

Our of curiousity, why did you turn off the quadtree optimization? It adds a few FPS on my machine.

it was a futile tweak at some point in trying to understand what was happening and I forgot to turn it back on. fixed, thanks for pointing it out!