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I have found that blender doesn't allow to apply subsurf modifier after some shape keys have been created. So why does this happen?

For animation i can just leave subsurf unapplied in the right panel and my model will be fine in blender's 3d view and only here. But what if i need to export my model 'smooth' with right conditions of vertex groups. There is some tutorial for solving my problem (Shape keys and applying subdivision surface modifier), but anyway, is this fact inevitable for all versions of blender and we always must do it like in the article? Thank for your attention!)

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Сoncerned Citizen
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    This happens because shape keys work only when all the mesh data (amount of faces, vertices etc.) is the same once the key is created. If applying Subsurf (or any modifier) the mesh data won't be the same (hance it's the modifier). It's probably that you don't have to do it all over again everywhere; it's just that the generative modifiers should be applied to meshes before the animation with shape keys is done. – Mr Zak Dec 21 '16 at 21:22
  • Hmm, but it's funny when blender allows itself to manipulate with vertex data smoothed by subsurf, when i just left it unapplied for my animation:) – Сoncerned Citizen Dec 23 '16 at 16:30

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