Sometimes it is confusing in the Rhino3D software in between the "Unroll", "Smash",
"Create UV Curve". I would like to take a look on all of this three all together
today, and tell you the difference between those three. Hi I'm PJ Chen, an
authorized Rhino trainer. Let's get started. In the Rhino3D "Unroll", "Smash", and
"Create UV Curve". They both serve the same function for trying to flatten the surface,
so you can work it on flat. People use "Unroll" doing some paper crafts, if we go
to google and then you can search for the "pepakura". Pepakura in Japan is
meaning papercraft. You can see a lot of people using pepper craft, which is a
software. It can flatten your 3D image into 2D, and then also giving the tabs, so
you can kind of glue it back together after laser, glue it back together, so
you'll get a 3D object and once you work on those you can use a fiberglass and
make them into the mask, and make it harder sort of things so a group of
people is working on this beautiful craft skill by using pepakura, however, in
the Rhino you can achieve the same thing using "Unroll". Okay, so right here I
have a block I'm gonna use "Unroll" command, so write a command I type it "unroll"
"UnrollSuf" and once you type it you have the option if you want to
explode it. we don't want to explode it at this point and then we don't want to
label. okay and then once you click it, it usually happen where at zero,
zero point. You have something like this. that means all the surface right
here is now flat, and then if you kind of fold it
back together, and put a tab, you can kind of make a paper craft out of it.
okay so what happened if I use the command "Smash" on the same object here.
here we go. We will use the "Smash" and then you can type "smash" or you can go
to the surface tool. under the surface edit tool you have a
look like a cat been run over. Alright, so we're gonna use the smash tool and
then we're working on... we don't want to explode it and then let's see what
happened it come up the same result here. so we're saying if you have the surfaces
completely flat it doesn't matter which
command that you use. okay, let's take a look on our second one. The second one is
a little bit twist on this surface so we're gonna use the same command. it's
called unroll surface and then we're gonna click on this object and we hit... we
don't want to explode it, and then we hit "enter". okay, you'll see the object right
here but before we are doing more action let's enlarge this area for our... you can
go back to look at the command that you did. right here, it says 2.65
percent bigger after unroll, so the surface... if you have this surface. let's
say I'm gonna move this surface here, and I'm going to explode it, and then all the
pieces if you try to glue it back together it will be 2.65 (percent)
bigger than this one on the model. okay, so let's take a look again with "Smash"
that's type it "smash" and it will ask you which surface and
then we want to pick up the whole second solid and then we hit "enter", and
again, you will come up with the same thing 2.65 (percent) bigger than (original) surface
bigger than the original surface so that means in this case I'm using "Unroll" and
using "Smash", they are the same. okay whether you have the flat surface or you
have one have them twist a little bit now let's take a look on this one
the shape is coming from a sphere and I just chopped off the top and the bottom
so that's you the "Unroll" command so type it here unroll surface and it says you
can unroll this surface because has a "doubly curved", alright so unroll surface
it doesn't apply to the surface has doubly curved. That means I'm curving from
this direction from the top to the bottom and also right to the left.
so I have 2 curves and then that doesn't work let's try to command for smash this
doubly curved alright so we're going to use the command "s-a-m-s-h" "smash" and then
we'll pick up our surface and then we hit "enter" and right there, it gives you a
surface. but let's take a look on our command bar. right here it says it is
39.15 percent smaller after unrolling and means this surface
is actually 40 percent smaller than what our original surface is. okay so it's not
accurate when it applied to the doubly curved surface. Alright,
in this case, we need to use the "Create UV Curve". "Create UV Curve" living under
the curve tool and then you have "curve from the object" and you have "create UV
curves" okay then we will select our our surface
and when you hit "Enter", it give you two boxes, and why is that, because I was
originally create this sphere and trimmed top in the bottom off, so the
computer will remember what was it, so the one on the top represent entire
sphere and the one in the middle is represent the surface that we have there (green)
okay so let's do a comparison. I'm gonna make this smaller. and then I'm going to
make this into the surface first by the "planar curves" here okay so that's that's
to analyze we're going to "analyze" and we go into "mass property" in the "area "okay
so I'm going to click on this one. alright, let me bring up the
bar a little bit bigger. so this one's saying it is 3.58 square millimeter
okay let's take a look on this one. this one is 2.17 it which is
much smaller and let's take a look on this one it's 4.14 square
millimeter so we know this one after smash is almost 40 percent smaller
this one is currently 4.14 square millimeter. so I just did the
calculation. it's like 15 percent bigger than what we have here. Alright and why
this is important is because a lot of time, we are working on the graphic in 2D
and then we want to flow it back to the surface
let's do a test here I'm going to draw a simple... let's just draw a circle. I'm
gonna put a circle right here and type it
2.5 so put a circle roughly in the middle and I'm gonna put a circle right
right here roughly in the middle with the same size we are going to use the
command for "Flow Along the Surface" to make this circle flows it back to the
green surface so here's what we do. We'll go to the "Transform"- "Flow Along Surface"
It will ask you the object. We want to pick up this object and then we hit "Enter". We
pick up one of the corner and then we come into this surface, and we pick up
one of the corner. okay right here you will see the ring is actually stretch a
lot. so you're no longer that ring it's a circle the circle stretch a lot so you
kind of understand that 40 percent different when you doing a very delicate
design flow it back. it will kind of totally stretched okay
so let's take a look on this one. I'm going to do this one twice, because I
want to show you there's a little differences that people always forget to
pick. I'm gonna use the surface which is really similar to our green surface okay
the same command we're going to use here is "Flow Along Surface" pick up the
object "enter" pick up one of the corner, and then we'll come in here, and we pick
up one of the corner. and then it give me this curve. and you say hey PJ it is only
15 percent different why stretched that much. when you use the UV curve,
Rhino will remember what was the original size, even though you already
trim it off. that's why it gives you two square here. so when you flow it back you
need to remember to use the original one so let's do another test. I'm going to
use the same command, which is "Flow Along Surface" is
living under the "Transform" and then you will pick up the object which is this
circle "enter", and you pick one of the corner. then we want to come back
here, and we pick one of the corner now you can see the circle that I have is the
third circle. it's much close to the original even though it is stretch a
little bit, but it's about 15 percent stretched. okay, so this is the difference
by using those three (commands). you may be curious why am I leaving those two blank. it's
because the "Create UV Curve" doesn't work on the polysurface. it only works on a
single surface, one at a time. even though I wanted to have this be flattened
I'll better to use "unroll" or "smash" but let me show you what I'm talking about. I
want to use the "Create UV Curve" on this block, so I'm going to the "Curve"- "Curve
from the Object" - "Create UV Curves" then it will ask me the surface to create a UV
curve and I'm clicking on the whole thing, but you only let me select one of
the surface. it's because it doesn't apply to the polysurface. Alright,
so then you will need to have.... you will come up this, and one at a time. so to do
it faster. In this case, "Unroll" and the "Smash" it's better than "Create UV Curve"
and just give you a recap. the reason we cannot have "Unroll" here is because it's
doubly curved surface so it doesn't work for "Unroll", and will only work for the
flat surface. Leave a command below, let me know what do you think about the
video, and what would you like to learn for Rhino3D software. I will do my best
to make a video for you. Please like and comment and share my video, that helped
me to make more free video for. you thank you for watching I'll see you next Monday.