# 3D and masking problem

**URL:** https://forum.kirupa.com/t/3d-and-masking-problem/307320
**Category:** flash
**Created:** [April 1, 2010, 3:24pm UTC](https://forum.kirupa.com/t/3d-and-masking-problem/307320 "2010-04-01T15:24:41Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![FlashFish](https://avatars.discourse-cdn.com/v4/letter/f/b9e5f3/32.png) [@FlashFish](https://forum.kirupa.com/u/FlashFish)
#### Post date: [April 1, 2010, 3:24pm UTC](https://forum.kirupa.com/t/3d-and-masking-problem/307320/1 "2010-04-01T15:24:41Z")

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I’m dabbling with 3D tweens but I’ve hit a snag. The tween works fine on it’s own and also with a simple mask on it. My issue is when I add a second keyframe to the mask layer to create a different shaped mask. When it reaches that frame my 3d tween goes crazy and flies off.

![](http://www.mediadisplays.tv/van%20media/maskproblem.gif)

Any thoughts would be appreciated!