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I am making a model of Helicopter. Its comparatively low in polygons. I want to create a cutout in it. Deleting faces or doing boolean operation on major portion of model, my model becomes a mess and shape drastically changes. Can anyone suggest what is the correct way to do it.

Highlighted faces I want to delete so I can create Window for Helicopter There

Shape after deleting the faces

Adding more geometry also causes the shape to change.

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The "problem" is caused by the subsurface modifier. it's the expected behavior.

You have a few options here:

— proximity loops: use ctrl + r to create supporting geometry around the edges of the hole

– edge crease: select the edges around the hole and press shift + e to change the crease weight (the edges become red)

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  • $\begingroup$ Is there way to freeze the Mesh. $\endgroup$ – Shabbir Merchant Oct 30 '17 at 5:05

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