8

590 Chapter 8: Modifiers
2. When dealing with MultiSegment seams , the
orderofcreationisimportant.Ifyouattempt
to create seams in the wrong order, you might
get a “Seamline topology is wrong” error,
and the seams will not be created. When
dealing with MultiSegment seams, create the
minimum number of seams necessar y to make
the MultiSegment seam match the topology of
theotherpiecetothatyouaregoingtoconnect.
In this case, you have an arm seam that is open
at the bottom, and a MultiSegment that is open
at both the top and the b ottom. If you closed
thesideofthegarment,you’dendupwith
the situation illustrated in the center image
below, where the seam is twisted (it cannot
be “untwisted” by reversing the seam). By
closing the top of the armhole MultiSegment
w ith a seam at the shoulder, you’ll create proper
topology to make the MultiSegment seam.
3. Next, you can seam up the sleeve to the
armhole. See the leftmost image below.
4. Finally, you can add the seam down the side of
thegarmentandacrosstheundersideofthe
sleeve (the order is irrelevant here).
Left: Seamcreatedforshoulderfirstandthenforthe
MultiSegment, producing the desired result.
Middle: Seam created at the bottom of the body
MultiSegment first, resulting in an irreversible MultiSegment
seam from t h e arm to the b ody.
Right: No seams made on the body to connect its
MultiSegment, resulting in a seam topology error.
Internal Seam Lines
When drawing panels, you can use extra open
splines to define seam lines within the panels,
also known as internal seam lines. Triangulation
always occurs along these internal seam lines, s o
youcanusethemtohelpdefinethestructureof
the cloth panel, and as
crease lines .Also,youcan
specify that an internal seam line should be
cut ,
so that the cloth separates along the line during
the simulation.
To create an internal seam line, simply specify
a Material ID of 2 for the internal spline, which
should not be closed. Also, for best results, keep
its endpoints away from other splines in the shape.
And, as with outside seam lines, an internal spline
should not cross over itself or other splines.
Left: Open spline, set to Material ID 2, specifies internal
seam line.
Center: At Garment M a ker > Curves or Seams sub-object
level, se am line is selected and Cut is turned on.
Right: Cloth separates along cut line during simulation.
Procedure
To place garment panels automatically:
The Garment Maker modifier provides tools
for positioning garment panels on a humanoid
character model. This automatic placement is
approximate; further adjustment is typically
necessar y.
1. Load or create your character model.
2. Create your panels as s pli nes or NURBS curves
paralleltotheworldXYplane(thatis,create
them i n the Top viewport).