Hello everyone. Welcome back to PJ Chen Design. Today we're gonna talk about
how do I get into this really flow form. Look like it is done by Tspline, but
it is just barebone Rhino. Are you ready? Let's get started!
so the idea for this form is from one of my YouTube subscribers sending couple
image one of architecture look like jewelry. As we can see this form. It's a
continued piece right in the middle. It look like I have some sort of curve on
the top and some sort of curve on the bottom, and it can be done by loft, so
let me show you how I draw this line correctly into those three sections. Let
me starting with the circle here, so we're gonna have a circle right here, and
I'm going to cut it out the same angle. so it's easier when the center is right
at the 0,0. You can have a different opening if you want to. I'm
just gonna eyeball it roughly about this angle and we can also change it later.
By using those two, I'm going to trim the bottom off. Okay so let's acting one of
the circle there. Let me go ahead and move this circle down become like this.
We need to have this circle repeating, so I'm going to using
the polar array, and let's put the center as zero, and let's do three of them for
360 degree. So that is that. We also need to have this arc coming over here.
And again it's hard to know like exactly if I am doing the symmetrical. So
always starting with the circle if I just do the arc it may not be 100% correct
so I'm roughly going to get something
look like this. and I'm gonna coming over here draw again a straight line
roughly something like this. Have this one mirror to the other side like this.
This time we want to pick the shorter one. so let's go ahead to trim the longer one
here, and here. Now with this arc, it's not in the right position we need
to move it over here, so that's go ahead to use the rotate tool. Set it up the
center right at the 0 right here, and we want to rotate this some way along
here. So the degree I am looking for is 360 divided by 6. so I'm gonna type it
-60 so that will be right there. okay and let's do a test and see if this
is the curve that we are looking for. I'm gonna use the blend tool and we are
going to blend from here to here, and that gives us some adjustment. We can do by
changing those and/or changing those so to fine whatever you like. If you feel
like this is too tall you can change it. And I'm going to stay with something
like this. I'm also going to do the same thing on the other side, and then
you okay something like this, and you can start take a look on this one, because we
could have those, very simply just polar array. Center with the 0, and polar
array three times, 360 degree, and then we get something like that. Again everybody
gonna come up something slightly different, and see how you like it.
and then if you don't like it, for example, we're gonna go back one more
step, and then we can have this one going mole off like bigger or smaller or close
or whatever that you are going to like. Alright so I did a little bit adjustment.
I find whatever shape that I like. Now they are in little sections.
In order to create a continual form, we need to have them become one single
curve. If you just join it. Let me explain to you what is the difference between
just joining, and after that you rebuild it. Here is a curve that we have,
and then I draw that, and I'm going to draw another curve right here.
So those are two curves, and if I join them together, it looked like they become one
single curve, but what happened is if I have that curve and then I try to
extrude it. Let's go to the surface, we want to extrude this curve going top
like this. It look like nothing is wrong, but look
this is seam right in the middle. and how do I know? you can tell that this is
darker line over here, right at this point. If I turn into the
black one might be easier for you to see. Now you see that darker line. That means
I can explode it this one become two surface, and that's because this is a
joint over there. and you can also join back. And you will say PJ
what's the differences between this one a continue
piece is because, if you look at the property over here. It says open polysurface.
That means you cannot edit with the control point when you try to turn
on a control point. It says cannot turn on the control point for the polysurface
where you're on a command bar. So how do we fix this. Let me do
one more time, we have this curve right here, we want to do a rebuild. Once we
rebuild, you can you see the number bump up so much from 9 to 45. It's because it
tried to trace every single curve as possible to match the original one, if
you keep it as 9, you can see that the curve is changing.
Everywhere is changing, and here is the largest deviation over here, so it will
show you your curve is changing. We try to keep it as same as possible but we
don't want a big number. Let me try 20 there. It's nice. You have it like
something like this. It's not too much of the difference, and then we click OK.
Now we cannot do exactly the same thing. We're gonna go to these
surface and extrude curves straight. All of sudden you see
a very uniform surface, and you can turn on the control point on this one, if you
want to. That way you can edit, if you want to. Let's go back to what we have
here. Since we want to do the editing, we need to make sure this is a single curve
as possible. Let's go ahead to do a "rebuild". In the rebuild command,
you can see all the sudden it becomes so weird shape, so we need to bump
up the number. If we pump up the number close to whatever it had, then you're
gonna have 63 point and it's getting really really close.
or you can reduce the number and see how much of a difference and if you
still like it. I'm going to stay with the same number as it suggests, and we're
gonna click okay. Now we got the new curve over here, so that's our curve.
We're going to create another curve right here on the bottom. Let's
take a look for some experiment. I'm going to bring this one up with those
two curves. Let's give it a try for the loft, we're gonna loft from here to here.
and make sure that they are aligned. In this case, it's really hard to see they
actually are aligned. So I'm going to move it this to the quadrant, and move
this to the quadrant or possible quadrant over here, and make sure they
are facing the same direction. Okay so now we have them aligned. Let's take a
look at this. You will get something like this.
It doesn't matter what option that you choose from they all
look the same, it's because we have to curve right in order to get different
type of curve that you need to have a 3rd curve in the in the middle.
We're gonna stay with this, and we're gonna click OK. So this is really
not what we're looking for, because we want the body is a little bit puffy okay.
So I want to rebuild the surface, and for some reason he
doesn't let me rebuild, and if I look at this I do have the two-seam there.
it is weird because I already rebuild the top, and shouldn't have the problem
so what is the problem? The problem is actually the bottom curve. So why
is that. Let's take a look on this bottom curve, and we want to put it on Rebuild.
Notice that the count is the same but degree is 2. So that's a degree 2
curve even we have a degree 3 curve on the top, that is still not
gonna work. So we need to make sure that we can stay with the same count, but we
want to make sure that it's a degree 3 curve. Then I will click OK there.
Alright so we're gonna go back and do again, and I intentionally to show you
this, because some of you may face in the same issue, and you might ask me. So let's
go to do the loft. We're gonna go from here to here, and again we want to make
sure that they are aligned to the same place, facing the same direction, and
let's click enter, and then that's click ok. Now we only have one seam there
That's a good sign. ok if we want to turn on a control point
those are the point that we have, you can try to see if it work.
Let's go ahead to select everybody, and we're gonna do the scale, so using the
gumball holding the SHIFT and drag it, and then you will get this bowl looking
thing. Now if this is the shape that you want, you can go ahead to offset
the surface, we're gonna set the distance for 1.5, and then we are going
to make sure it's not solid, and this is what we get. You want to watch out
there's no folding sometime like this. You are folding into itself. This
could be the potential issue, when you try to print and it just tell you that
error and the whole piece is solid. I'm sure that
you have that experience.So sometimes offset is a great tool
sometimes it's not especially when you offset something
with the larger distance. So this is what I usually will do instead of doing the
offset on the surface. I always like to offset for the curve.
Let's go ahead to do exactly the same number, so we're gonna offset distance
for 1.5 and this is what we get there. we're gonna offset this one again for 1.5
So this is what we get there. I'm going to change the color to the red one,
so it's easier for you to see. Instead of doing an offset, we are
going to build a surface one more time with the loft. So let's go ahead to do
the loft from here to here. Make sure they are aligned. so we're gonna snapping
into a quadrant to the quadrant, and make sure they are the same direction. So
this is what we get. Let me turn into the red color, and not only it is intersected
you notice that the surface is a lot more complicated right. So let's go ahead
to turn on the control point and we're gonna do the same thing, and then we are
going to scale it up something like that. So now let's double check.
There's no folding. It's really nice over there.
There's no folding on the top, so this is good to go. Alright so now we need to
create we can do cap both top and the bottom. You can use the cap if you want
to, or you can use the blend tool. If you use the cab it's going to be flat.
so we're gonna pick up the first edge, second edge, and we click OK. Then it
give you this kind of like bumpy surface. And then you can change it. Say you
want a higher, lower or whatever you like. this will
be the surface, and once again make sure that nothing is twisting too
much over there. You can changing those options over here and see what kind of
result that you get, but if it does has the twist, you can always change into
this sweep 2 rails. So that is one. We also wanted to do the bottom one, and
then that is two, so once everything is done let's go ahead to join them and
double check is says closed solid polysurface on our property. Many of
you have being watching my video in the past year, and being really supported to
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keep going to produce more videos. Thank you for watching, I will see you next!