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Tutorials » 3D

Object VR In Flash MX
Author: Tim Murray | Website: http://www.gmg.com.au |

Making the driver handle any movie length

Throughout all of our examples here, I have focussed on only one QTVR movie: the one supplied by the Western Australian Museum. It has 36 frames in it and runs at 1 fps. Your Object VR will inevitably have a different length and changing the magic numbers of 36 and 37 that we have used here to other magic numbers that relate to the number of frames in other movies will only lead to pain. So let's fix that.

The _parent object has a _totalframes property which lets us know how many frames are in the parent Movie Clip. In our case, when we use the code _parent._totalframes in our driver clip's enterFrame event handler, Flash MX looks at the qtvr clip and checks to see how many frames it has (36 for ours, yours will probably be different).

Replacing 36 with _parent._totalframes, and 37 with (_parent._totalframes + 1) gives us our new code:

onClipEvent (enterFrame) {
     framePos = int(_xmouse / 100 * _parent._totalframes);
     if (framePos < 0) {
         _parent.gotoAndStop(_parent._totalframes + 1 - (_parent._totalframes + ((framePos + 1) % _parent._totalframes)));
     } else {      
         _parent.gotoAndStop(_parent._totalframes + 1 - (1 + (framePos % _parent._totalframes)));
     }
}

This lets our driver clip handle any length QTVR movie as long as we have the same number of frames in the driver and mov layers. If the driver layer has more frames than the mov layer, the Object VR will disappear for some frames. If the mov layer has more frames than the driver layer, the Object VR will get stuck when it hits a frame where the driver doesn't exist.

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