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I am working on a plane for a mod and want to know: How can I create a separate interior mesh, basically making it a solid object. How can I do this without using the solidify modifier?

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One possible solution would be to:

  • Go to Edit Mode
  • Duplicate the mesh you want an interior for with Shift+D and press Right Click to apply.
  • With the duplicated mesh selected, press Alt+S to evenly scale down the duplicated Mesh and right click to apply.
  • Now press Shift+N to flip the face normals. Check/Uncheck the inside option for the desired result. enter image description here

Additionally you can enable 'Backface Culling' to visually see if the interior has the correct face orientation.

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Also addtional you can enable face orientation for this. Red means backface, Blue means the correct front face.

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  • $\begingroup$ Thank you for the suggestion, however there is the problem of the separate mesh being visible through the windows. $\endgroup$
    – Jameson4279
    Commented Jul 9, 2022 at 21:42
  • $\begingroup$ Yea, you'll have to cut make the same holes for the interior mesh as well. $\endgroup$
    – Asura_Sloth
    Commented Jul 10, 2022 at 11:45

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