Live 3D Plotting

function: function可以是x,y的函数,如sin(x)*cos(y);也可以是用逗号分隔的参数方程, 如sin(x)*cos(y),sin(x)*sin(y),cos(x).
鼠标拖动图形可以旋转观看;按住Shift键,拖动鼠标可以缩放图形。
x from: to
y from: to
Number of points to plot: