diymirage said

The formula is pretty short, actually
(Feel free to Google it, if it doesn't make sense)

exp(-((x-4)^2+(y-4)^2)^2/1000) + exp(-((x+4)^2+(y+4)^2)^2/1000) + 0.1exp(-((x+4)^2+(y+4)^2)^2)+0.1exp(-((x -4)^2+(y- 4)^2)^2)

Click to expand...