manifold extrusion what's up i'm jonathan and welcome to make tales where i'm sharing my maker
journey to help you go further in yours so don't forget to subscribe and hit that little bell icon
to never miss an opportunity to keep making this video is all about extrude manifold and internal
faces because let's be quite frank here everywhere on youtube is saying that extrude manifold
is the sketchup of blender and it isn't quite frankly it's a mess and if you don't know how
to use it and how to watch out for the pitfalls of it it can really muddle you up very quickly
so let's go ahead let's see how to use it what it can be used for and do we even need to use
it starting with a fresh blender file let's go ahead select everything delete it and bring in
ourselves a 10 millimeter cube we're going to talk about extrude manifold what exactly it is
why it sort of exists and do you really need to use it and why is everybody saying
this is the new sketchup way of modeling because i can tell you right now it isn't
so let's go here right click subdivide this and let's subdivide it by about that much yeah
let's go to subdivisions so extrude manifold is this a normal extrusion would not let you to do
this however an extrude manifold would let you do this but don't get
confused because extrude manifold will not let you do this go past an edge however what it has done
is you can select both of these edges and delete them like so okay now you could very much do this
with a normal extrusion and the way that it's done with a normal extrusion is you turn on
there are auto merging we also go over to our tools and we make sure that our auto merge
has split edge faces on and now here we're going to do a normal extrusion downwards
now you can select these faces right here and just delete the faces
there in a nutshell is extruded manifold it's not that special all it's really done is a couple of
operations without you noticing and the truth is it can be a bit of a catch because if you're not
truly aware of what extrude manifold does you might think that you can get away with doing this
grab this edge extrude manifold and drag it to there you currently have just created yourself
a problem and that is you have an internal face because you've just gone past an edge if you've
done this the normal way when i say normal way it's very limited let's go extrude normally go
this way remember that we have auto merging on we have created more geometry here to keep that as a
quad because when we do a manifold it removes that and we know that we've just moved over faces and
because we have moved over faces now let's just do a quick clean up we're going to do a search
for interior faces it's going to select them and then all you're going to do is x face delete
because we had these two faces underneath there all right now this type of modeling
in essence i would refrain from especially when you're doing the rough pass at the beginning
because what you're doing is you're stopping the ability of being able to use your loop selection
and loop cut tools and i would always say try and use as much as the loop work round and the quad
work way so to speak until you're happy with the overall shape then from there go limited dissolve
and go crazy getting your precision model in place but remember you do need to refine it
and define every edge just like we did in the last video okay so that there is extrude manifold
now don't get confused extrude manifold is not sketchup if you were to do an extrude manifold and
pull this all the way through your cube it doesn't do what you want it to i have a feeling they will
implement something like that in the future but not right now if you're gonna do things like that
just select the face on both sides do a control e and do bridge edge loops and that's going to now
bridge that hole right there extrude manifold can be very powerful but it can also be very
annoying let's see if i can get you to a problem that i had while i was researching for this
let's create ourselves a cube 10 millimeters once again and you would expect that you can
select one face go subdivide and put in 10 here because with an extrude manifold
you should be able to just go here extrude manifold pull it down it goes great okay so
i was thinking this would be a very nice quick and easy way to create something like this we
would be able to grab all of these all at once and then we're going to do a lovely extrude manifold
and things don't always work out yes it can be very powerful but just keep in mind that i have
a feeling that this is quite a work in development and use it in your own cases with a pinch of salt
just be aware that it can break things and to be aware for internal faces and internal faces
be aware of them whenever because it you could very easily go ahead right now
think that you were selecting all of this here then we're going to go and extrude this upwards to
here we've just created a whole bunch of internal geometry there we have all of these faces now here
going crazy so just be aware we have internal faces grab them delete them because they can
really screw up your workflow later on in the modeling process when we're using things like
modifiers and that's what i've got to say about extrude manifold i know it's a little
bit of a short video and quite frankly it might feel like it's just a throwaway but in reality
it's quite crucial all i want to do is give you all the knowledge out there so you can
really make your own knowledgeable decision on if you should or should not use extrude manifold
i know quite frankly i hardly use it at all because i find that i get more problems when
i'm using extrude manifold than any other tool in blender anyway a huge thank you to my patrons
you guys are absolutely awesome and it's the reason why i can make these videos right here
and if you're enjoying the videos that i'm making here and you think i'm worthy of
your support i would love to see you there too don't forget that we have a discord and that's
linked down in the description thank you for watching keep making and let the quest continue