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This is my mesh in Blender:

enter image description here

And this my mesh when placed in UDK:

enter image description here

As you can see it doesn't have the human head/chest part, parts of the hood are invisible, and it has some white lines. Why?

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  • $\begingroup$ It looks like the normals of the human are inverted, try selecting all in edit mode and pressing Ctrl+N $\endgroup$ – gandalf3 Jan 31 '14 at 1:08
  • $\begingroup$ It worked , but i still have those other bugs and as u can see it's like the part where the hood connects to the cloth dissappears when u look it on some directions , why ? $\endgroup$ – user2087 Jan 31 '14 at 1:14
  • $\begingroup$ That is because the mesh has no thickness. Try adding some thickness to the mesh. The fastest way is probably the solidify modifier. $\endgroup$ – gandalf3 Jan 31 '14 at 1:17
  • $\begingroup$ Cool , but i still have those white lines and why is my model a "non-collision" model ? $\endgroup$ – user2087 Jan 31 '14 at 1:25
  • $\begingroup$ I don't know, that sounds like something to do with UDK. $\endgroup$ – gandalf3 Jan 31 '14 at 1:32
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It looks like:

  • The human mesh's normals are flipped. You can correct that by selecting all of it in edit mode (A) and then pressing CtrlN

  • The hood/robe mesh has no thickness, so parts of it will disappear due to backface culling. You can fix this by adding some thickness with the Solidify modifier.

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