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Why Edge Split doesn't dynamically apply its functions through animation?

Using it as a tool (Mesh->Edges->Edge Split) allows you to manipulate each face independently. However Edge Split modifier doesn't work like that. Yes it still increase vertex count but doesn't actually split geometry, unless click Apply button.

Setup:

1. Hook is binded to the top face with Sharp edge surrounding

2. Split Edge modifier is splitting top face

enter image description here

Now animated hook is trying to move it: There is no visible split. enter image description here

After pressing Apply in Edge Split modifer: Whole different picture enter image description here

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  • $\begingroup$ As the name of the modifier suggesting it is splitting edges. So it's completely normal that after applying it, edges aren't connected. You can try AutoSmooth instead. $\endgroup$
    – cgslav
    Commented Oct 23, 2017 at 11:37
  • $\begingroup$ The modifier only takes effect after your mesh is moved. That's with every modifier. $\endgroup$
    – Dimali
    Commented Oct 23, 2017 at 11:38
  • $\begingroup$ LukeD, so why it splits edges and at the same time keeps them connected before applying? Mr Zak, in edit mode select vertices and hit CTRL H $\endgroup$
    – Serge L
    Commented Oct 23, 2017 at 12:13
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    $\begingroup$ Because the nature of modifiers is that they are non-destructive tools. Same thing is for example with Subdivision Surface and Bevel. Both are creating additional faces/vertices but you can edit them only after applying modifiers. docs.blender.org/manual/en/dev/modeling/modifiers/… $\endgroup$
    – cgslav
    Commented Oct 23, 2017 at 12:18
  • $\begingroup$ When you edit a mesh, you edit its state before modification. So while the modifier is live, it will split the edges wherever you have put them. After application, you move the edges after they have been split. $\endgroup$
    – Robin Betts ♦
    Commented Aug 17, 2018 at 16:30

2 Answers 2

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so why it splits edges and at the same time keeps them connected before applying?

Edge split modifier actually split geometry. But you test this using wrong way. Try to add Susurf after Edge Split:

enter image description here

When you adding hooks it moves both arrays of vertex, that splitted by edge split modifier

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  • $\begingroup$ If it clones edges that are already binded to Hook, then why after applying these copied edges aren't belong to Hook? $\endgroup$
    – Serge L
    Commented Oct 23, 2017 at 12:26
  • $\begingroup$ Looks like new vertex lose some information about hooks, while applying. It looks like a bug, but not a rule $\endgroup$
    – Crantisz
    Commented Oct 23, 2017 at 14:23
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Yes, I understood your problem but i suggest you to split the only desired face by this method:

1:Select Step 1 Select

2:Press Ctrl+E

enter image description here

3: Click on Edge Split

enter image description here

And the results would be much better. By this only your desired face will be splitted as it also does not cause increase in unwanted geometery...

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    $\begingroup$ Main thing, why I am bothering with this modifier - is ability to merge this face back later in animation. If I split it in edit mode, I couldn't use Subsurf modifier for example or Bevel. Yes I can use Explode+Particle System, but I was hoping to find different approach. $\endgroup$
    – Serge L
    Commented Oct 24, 2017 at 16:33

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