Re: make a play button to play 3d animation

Your buttons need to call JavaScript referencing the 3D annotation, and the runtime.play() or runtime.pause() methods.

e.g. to replicate someone pressing the PLAY button on the 3D toolbar:

getAnnots3D(pageNum)[0].context3D.runtime.play();

If the 3D scene isn't configured with an active animation (the "PLAY" button on the toolbar is disabled), or it has several to choose from, you need to attach a JavaScript file to the 3D annotation (via the Advanced Properties dialog) that activates the one you want, e.g.:

var _anim = scene.animations.getByIndex(0); // choose the first sequence

scene.activateAnimation(_anim); // assign it to the PLAY button

It's all documented in the Acrobat SDK under JavaScript > JavaScript for Acrobat 3D Annotations  http://bit.ly/AXISDKH