Add smoothness to your meshes using remeshing! 3D 101 Video Lecture | What is 3D Printing: Basic Knowledge - IT & Software

in today's video I'm going to show you
how to turn this into this using mesh
simplification or re meshing let's get
straight into it I'll come back to make
this music ice my name is Angus and say
we're going to look at how you can use
reassuring algorithms to add detail and
smoothness back into models that might
not have already had it so as a perfect
example here I have a deathclaw pulled
from Fallout 4 and it in games model
meshes have quite a low what's called
polygon or triangle count because they
need to be kept light and efficient and
then the game will add textures on top
and use very sophisticated bump maps to
kind of add that detail back in but when
you pull them out of the games you end
up with what's what looks like this
if I press W to show the wireframe you
can see the triangles are very obvious
so if I 3d printed this it would look
like this it would look lo polygon which
is a look sometimes people like but in
my case I wants look smooth and for some
people you might think are printed and
then sand it or something like that you
can actually add smoothness back into
your models before you even commit them
to a 3d printer or another purpose and
that's going to talk about in this video
today so let's select the head within
mesh mixer by just clicking around it
like this there we go so I've got the
head selected there and we're going to
go to edit and re mesh now I'm not going
to pretend I understand all the
different kinds of algorithms used in
rematching tools but all I know is that
they're very powerful but do need a bit
of tweaking to get them working right
for your application so for example the
default here is definitely not what we
want so let's go to perhaps let's have a
look at linear subdivision linear
subdivision if I press W will be the
most it's the most common and simple
kind of remesh Inge it's simply
subdividing the triangles but why would
you want to add more triangles without
actually changing the geometry well in
my experience mesh mixer actually likes
to have more triangles to work with when
doing boolean operations so if you're
trying to mesh mix two things together
with a Berlin Union or a billion
subtraction for example or intersection
adding more triangles might make that
result a little bit better but in our
case we actually want to
geometry so let's go through the other
options may be relative density let's
try that so that's gonna smooth out
things a bit which actually looks pretty
good we're losing a lot of detail in the
eyes there that's not really what we
want
what about adaptive density let's have a
look at that there we go we've got a bit
more detail back in the eyes and it's
not perfect but when you print this it
will certainly look a lot smoother then
if you printed it as it was before as
you can tell remission can be quite
labor-intensive on your computer so
always keep that in mind that when you
do a command maybe just sit back and let
it do its thing so there we go
45% density that is a lot more triangles
than we had before but you can see it's
tons smoother and that'll print a lot
smoother than it would have beforehand
but how did I achieve this model if I
press W that's a ton of triangles
compared to the original and actually
use mesh layer to do this and my
favorite remitting algorithm let's jump
over to mesh labs so the thing to note
about mesh labs is there's no undo you
can't go back if you want to change
something you have to just completely
reload it and it's very clunky to use so
I only use this software because it can
import a lot of different mesh formats
if I need to convert and because it's
really meshing algorithms second to none
so let me show you my favorite filter to
add detail back into a model like this
it's called butterfly subdivision so
let's go to filters and we want to go to
Rhema Sheen simplification and
reconstruction again as I said there is
so many different kinds so many
different research projects and and
thesis 'iz have gone into this the
software not gonna pretend I understand
them but I do know what I'm after
subdivision services butterfly
subdivision all right so as I said I
only know how to use the tools to do
what I want I don't fully understand how
they work but there's different
iterations which I far as I understand
the more you give it the more resolve
the the mesh becomes and the more
smoother it becomes and then you have
different units percentages so let's go
with maybe five and ten
I guess that didn't do much what about
one that's more like it
okay so one of the iterations of 10 and
a threshold of 1 and that seems to done
a pretty good job let's have a look at
what the mesh actually looks like and he
says it's smooth over everything but
it's actually kept some of the sharp
details it's kept the tongue and it's
kept all those which is really quite in
my opinion really unbelievably powerful
less than 0.5 there so that's that's
added a unbelievable amount of triangles
in and that has turned this model into a
ridiculously smooth model apply so now
we've got our model with all the extra
detail added in all you need to do to
get added meshlab is to go to file and
then export mesh as and obviously if
it's really printing it choose STL and
you're good to go
so the thing to keep in mind is the more
triangles you add the large of the file
size so in my second video in this
series I'm going to talk about mesh
simplification or decimation or in other
words getting a mesh that's very high
triangle count and making it a little
bit more manageable because sometimes
when you're using 3d scanners
specifically you'll end up with measures
that are gigabytes in size and obviously
manipulating those is very difficult the
detail they have in the Triangle density
is not even reproducible on a 3d printer
so you might actually want to get those
matches and take some of the triangles
out so you can work on them a little bit
easier so that's not going to talk about
in the second video in the series so if
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look forward to seeing again very
shortly here on maker's news
catch you later guys bye