Re: Animate drawing of a ruled surface?

*To*: mathgroup at smc.vnet.net*Subject*: [mg122920] Re: Animate drawing of a ruled surface?*From*: "Oleksandr Rasputinov" <oleksandr_rasputinov at hmamail.com>*Date*: Wed, 16 Nov 2011 04:45:41 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <j9tg85$n8r$1@smc.vnet.net>

On Tue, 15 Nov 2011 10:51:49 -0000, Dmichael <pwaslo at yahoo.com> wrote: > Hi, > > I want to animate the drawing of a ruled surface. > > So, for example, say I want to animate the drawing of a helix. > > I create the surface with this command: > > ParametricPlot3D[{u*Cos[v], u*Sin[v], (1/2)*v}, {u, -1, 1}, {v, 0, 2 > \[Pi]}] > > Then I want an animation of the surface being drawn as the line sweeps > out the surface. So I try this which shows the line but doesn't animate > the drawing of the surface. > > Animate[ParametricPlot3D[{u*Cos[v], u*Sin[v], (1/2)*v}, {u, -4, 4}, > PlotRange -> 6], {v, 0, 4 \[Pi]}] > > Any ideas? Thanks! > How about Animate[ ParametricPlot3D[ {u*Cos[v], u*Sin[v], (1/2)*v}, {u, -1, 1}, {v, 0, vmax}, PlotRange -> {{-1, 1}, {-1, 1}, {0, Pi}}, PerformanceGoal -> "Quality" ], {vmax, 0, 2 Pi} ] ?