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Why is there no collision on my Flipbook?

  • 4.7

  • Windows: 8.1

I am making a Paper2D project at the moment and I might have found a bug with Event Hit when using a Flipbook.

Not Working

Now this doesn't work. It's a Flipbook Component.


But this works, and that's a Sprite.

So I have a suspicion that it doesn't work for Flipbooks. Below is a video of the lowest picture setup working as intended:



After further inspection Hit and Overlap doesn't work for the Flipbook.

Product Version: Not Selected
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asked Mar 22 '15 at 11:59 PM in Bug Reports

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Hi Vipar,

I wasn't able to reproduce this in 4.7.3. Do you have collision set in your flipbook asset?

alt text

If so, can you show me the collision settings for your Blueprint which contains the flipbook component? Thanks!

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answered Mar 23 '15 at 08:42 PM

avatar image OmniOwl Mar 23 '15 at 09:21 PM

I guess that was the problem. Strange. It's set to collision per default on Sprites. Might have to change the default values on Flipbooks to be First Frame Collision as well?

avatar image Ben Halliday STAFF Mar 23 '15 at 09:40 PM

The default is set to No Collision because it's less expensive to use a standard collision box component in a Blueprint instead of using Flipbook collision, and it's generally better practice for performance not to use it if it's not necessary.

For reference, first Frame Collision will use the collision from the first frame of the flipbook, and Each Frame Collision will update the collision to match each Sprite used in the Flipbook. The latter is obviously expensive as it recreates the physics state every frame.

avatar image OmniOwl Mar 23 '15 at 10:52 PM

I see. Why is not using the Collision Box I gave it in the Sprite Making process?

avatar image Ben Halliday STAFF Mar 24 '15 at 12:36 PM

If you enable Collision Source in your Flipbook, it does use the collision from your Sprite. Depending on the setting, it will use the collision from the first Sprite in your Flipbook, or it will update to match the collision from each Sprite in the Flipbook.

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