Plot3D[x^3/(x^2 + y^2)^2, {x, -1.7, 1.7}, {y, -3.16, 3.16},
PlotRange -> {-0.5, .5}, ClippingStyle -> None]
ClippingStyle就是控制曲面超出约束范围时的样式的~如图：
PlotRange->All
