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I'm working on a bathroom interior, and I was trying to shape the shower curtain by following this tutorial:
Modeling with Cloth Simulation in Blender

For some reason, after I selected the pinned verticies group, and ran the simulation, the cloth was affected by the pinned verticies, and also sagged, but all the movement was done in one plane, so there were no wrinkles. How can I fix this? Here is an image of one of my tests so you can see what is happening:

incorrect cloth simulation

Here are my Physics Settings (As far as I know, they are the same as what he has, and also, I have animated shape keys so that the cloth would fold).

Physics Settings

Here is the .blend: https://drive.google.com/file/d/0B5Rj7h_MP4waeU5yc3ZyV0VZQlU/view?usp=sharing

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    $\begingroup$ Could you screenshot your cloth settings? $\endgroup$ – TARDIS Maker Jun 6 '15 at 2:57
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    $\begingroup$ Do you have force fields? $\endgroup$ – VRM Jun 6 '15 at 2:58
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    $\begingroup$ Does that mean only the top are assigned? If that wasn't the problem, I would change the preset to silk. This won't be at all what your looking for, but it will show if the problem is the stiffness. $\endgroup$ – TARDIS Maker Jun 6 '15 at 3:08
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    $\begingroup$ Okay, can you upload a .blend than? I don't think anyone can really tell the answer here without playing with the scene your playing with. And it doesn't have to be the actual scene. As long as it shows off the problem it will work. $\endgroup$ – TARDIS Maker Jun 6 '15 at 3:11
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    $\begingroup$ Try activating self collision, and change and put the key frames closer together. I don't know exactly why it's doing what it's doing, but that seems to help for me. $\endgroup$ – TARDIS Maker Jun 6 '15 at 3:24
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The problem was that I was trying to do a cloth simulation inside a scene with several objects already inside. Many people had the same problem in the comments on this video:

Modeling with Cloth Simulation in Blender

The trick was to do the cloth sim in a different scene and then import the mesh into the scene you want to use it in.

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    $\begingroup$ Too many collision objects in the Scene slowed the simulation down? I don't understand what the issue was. $\endgroup$ – Luis B Jun 26 '15 at 16:24

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