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I'm new to blender and I wanted to make a support beam for this roof but I don't want the beam to extrude beyond the roof and just end at the base of the roof. How would I go about removing the top portion of this cylinder?enter image description here

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2 Answers 2

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Give your cylinder a Boolean modifier with the plane as Object:

enter image description here

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    $\begingroup$ if you have problems as i had with moonboots solution and it cuts off the wrong half: select your plane, TAB -> edit mode -> mesh -> normals -> flip so get you get the right one ;) $\endgroup$
    – Chris
    Commented Mar 23, 2022 at 15:24
  • $\begingroup$ and i always thought boolean with planes won't work because it needs volume...+1 $\endgroup$
    – Chris
    Commented Mar 23, 2022 at 15:24
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    $\begingroup$ @ Chris, like you I was not sure but it worked ;) $\endgroup$
    – moonboots
    Commented Mar 23, 2022 at 15:29
  • $\begingroup$ Blender is just awesome. I am so often positively surprised what it is capable of....faszinating. $\endgroup$
    – Chris
    Commented Mar 23, 2022 at 15:32
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With these snap settings:

enter image description here

you can do this:

enter image description here

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