Working on Windows 7 platform, I'm interested in creating an app that could run on Android devices (phone or tablet), IOS devices (iPhone, iPad), and the web. First target would be Android.

Do you remember those old Arthur Murray footstep diagrams to teach dancing? I want to do the same thing, but animate the steps, so the user can play them all, as well as step forward or backward thru them at their own pace. Perhaps one could generate an animated GIF and then play it on the platform.

So there would seem to be two parts to this: 1) A good way to generate the animation images. I can, for example, see using SketchUp - something I know - for this. But is there something better it would be worth investing in? And, 2) How to play the result, including options for playback speed control, and even forward/backward stepping? Ideally a single, or easily adaptable player to the three different OS platforms.