Animation of a rotating object. (Mathematica 6)

*To*: mathgroup at smc.vnet.net*Subject*: [mg80753] Animation of a rotating object. (Mathematica 6)*From*: Nacho <ncc1701zzz at gmail.com>*Date*: Thu, 30 Aug 2007 23:49:53 -0400 (EDT)

Hello. I'm trying to make an animation of a rotating 3D object and I'm having some problems. I want to make a list of images to export them to an AVI file. For example, the following object: a = Plot3D[Sin[x y], {x, -5, 5}, {y, -5, 5}, MaxRecursion -> 1, PlotPoints -> 50, Mesh -> None]; I want to rotate it around the z axis slowly. I've tried Rotate and changing ViewPoint, but neither work for me because Rotate distorted the scale of every image and changing ViewPoint only works if I want to rotate everything at the same time. I think that I should use Rotate, so I can Rotate several objects in different angles or speeds. But I would like to avoid the distortion in the size of the image: I've tried specifying PlotRange, and it looks promising, but I have two problems: calculating the best PlotRange paramters so everything is included, and maximizing the plotted area (so the white region around the objects is minimized). This is close, but a lot of white space is around the object, and I have to set the limits of PlotRange by try-and-see. b = Table[ Graphics3D[Rotate[a[[1]], phi, {0, 0, 1}], Boxed -> False, PlotRange -> {{-7, 7}, {-7, 7}, {-1, 1}}], {phi, 0, 1/4 Pi, 1/4 Pi /5}] Any hint to do this? The object doesn't need to be this particular Plot3D. It could be a ParametricPlot3D, several Graphics3D primitives, etc. Thanks a lot. Best regards.