so this happens when I use the subdivision modifier. any explanation?
mesh without any other modifier:
after subdivision surface modifier:
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possible duplicate of https://blender.stackexchange.com/questions/6425/keep-sharp-edges-when-using-subdivision-surface – yann Jun 17 '18 at 14:49
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actually no it's a different issue – orion Jun 17 '18 at 15:24
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It is exactly the same issue. All you need to know is in gandalfs excellent answer. Your model lacks holding/supporting edges. Also you have huge n-gons that don't subdivide well (they get triangulated) on the front and back side of your model. A quick fix would be a bevel modifier before your subdiv modifier, but this only hides the topology inaccuracies. Look into basic modeling and topology tutorials and try to stick with quad only topology. – yann Jun 17 '18 at 15:41