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Lets say I want to decrease the height of the back of the chair, or all of its legs, how is the easier way to do it? I mean without cutting each of them into two pieces and deleting the remaining parts.

If I choose all the bottom faces of the legs, press E , and then drag up, it will create hollow spaces. Same thing probably applied for the back of the chair.

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    $\begingroup$ blender.stackexchange.com/questions/51729/… blender.stackexchange.com/questions/50780/… blender.stackexchange.com/questions/8639/… $\endgroup$
    – Timaroberts
    Commented Dec 30, 2020 at 14:45
  • $\begingroup$ it's not clear what you mean by intrude, could you please show what you mean with a second picture? There's a new tool called Extrude Manifold (Alt E) but I'm not sure it's what you're looking for $\endgroup$
    – moonboots
    Commented Dec 30, 2020 at 14:56
  • $\begingroup$ @moonboots if its not clear then read the entirety of the post, if its not clear by second picture then read the whole thing $\endgroup$
    – Agil GA
    Commented Jan 2, 2021 at 16:32
  • $\begingroup$ I thought you wanted something else than just move down the faces, "intrude" sounds like the opposite of "extrude", and in Blender extrude is this particular operation than you get pressing E, there's no "intrusion" per se, except lately with alt E > Extrude Manifold, but I was not sure this is what you wanted and actually it was not ;) $\endgroup$
    – moonboots
    Commented Jan 2, 2021 at 16:40

2 Answers 2

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The answer is to simply just grab all the faces on the bottom of the chair, press G to grab them, and press Z afterwards to pull the faces only vertically. This isn't intruding, but just moving faces. Simply put, drag the faces up without pressing E, in the case of the chair legs. I hope this answers your question!

On another note... if you press I, then inset faces, and then extrude, moving up into the mesh, it will create a hollow space with depth, rather than just 4 faces with no cap. This second response probably doesn't answer your question, but this is probably what 'Intrude' means in Blender.

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  • $\begingroup$ sorry, it doesnt work in this version of my chair i.imgur.com/gV1I6f8.png In this, using G + Z creates hollow spaces like with E. $\endgroup$
    – Agil GA
    Commented Dec 30, 2020 at 15:56
  • $\begingroup$ You have already extruded, meaning that there are new vertices that are being grabbed. Grab the face, press 'x' and click on 'delete faces'. Depending on how many times you extruded, you need to repeat this process until there isn't a face on the bottom of the chair. then grab the edges around the bottom of the chair, and press 'F' to fill. This will make a new face, and grab that face and move it $\endgroup$
    – Relevred
    Commented Dec 30, 2020 at 17:33
  • $\begingroup$ Sorry I dont really understand here. And you probably mixed up "select" with "grab" there in your comment $\endgroup$
    – Agil GA
    Commented Jan 1, 2021 at 15:44
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Maybe what you are searching is Extrude Manifold. You can activate it with Shift+Space, then Shift+4. Or just click and hold over the extrude icon and select Extrude Manifold.

When you have a face that is surrounded like this, it basically does Inset + Extrude.

Like thisto this

When it doesn't have an adjacent face it does this:

enter image description hereenter image description here

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