Is this a bug or is this supposed to happen?

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foundmarble
Posts: 91
Joined: Fri Nov 05, 2004 12:33 am

Is this a bug or is this supposed to happen?

Post by foundmarble » Tue Nov 05, 2013 8:28 pm

I was experimenting with a few things and noticed something a little odd about the triangle shape and point animation.

Here's what I did:

1. Create a triangle with the draw shape tool - Frame 0.
2. add a key frame for all three points on frame #1.
3. On Frame 12 translate all 3 points to another location.
4. Scale the three points up a bit on frame 15.
5. Frame 25, translate the three points to another location.

I have all keyframes set to smooth interpolation.

Play the animation. The top point drags behind. Why is this?

I tried using other shapes (star, rect, circle) using the exact keyframe senerio and this dragging does not happen.

If I was a betting man, I would bet this has to do with the scaling of the points. (if you try this without the scaling, it doesn't drag the top point)

The thing that baffles me, is the other shapes are not behaving in this manner.

THanks!
sbtamu
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Joined: Tue Dec 15, 2009 5:05 am
Location: Texas
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Re: Is this a bug or is this supposed to happen?

Post by sbtamu » Tue Nov 05, 2013 8:50 pm

It must be the way the translation is calculated with smooth interpolation because It does not do this with linear or ease in/out.
Sorry for bad animation

http://www.youtube.com/user/sbtamu
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foundmarble
Posts: 91
Joined: Fri Nov 05, 2004 12:33 am

Re: Is this a bug or is this supposed to happen?

Post by foundmarble » Tue Nov 05, 2013 9:35 pm

I noticed that also. But again, why just the triangle?

When I create my own triangle, the manually created triangle works as it is supposed to.
Anyway, I wouldn't lose sleep over this. It was more puzzling than anything else.
JCook
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Location: Cape Cod, MA

Re: Is this a bug or is this supposed to happen?

Post by JCook » Tue Nov 12, 2013 2:25 pm

I tried this just as you described and I didn't see the effect you're talking about. Then I looked at the key frame interpolation and it was set to Bezier by default. When I set it to smooth I saw what you described, so it must somehow be a Smooth interpolation problem.

Jack
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