To
style the hair you manipulate either the Start or Rest curves to
achieve the look you want. In these next steps you first edit the
Start curves to create the basic hair shape. Then you set an initial
Rest position for the hair and style the hair by editing the Rest
curves.
To edit the Start curves to create the
basic hair shape
- Display the Start curves. (
Hair > Display > Start
Position).
- Tumble the camera so you’re looking at
the side of Marion’s head.
- To select the Start curves on the front
half of Marion’s face, do the following:
- On the Status Line,
click the Object Selection Mask button
and choose All Objects Off from the drop-down
menu that appears.
- On the Status Line,
click to highlight the icon
to restrict the selection to curves.
- Drag around the front half of Marion’s
head to select the Start curves as shown in the following image.
- Now tumble the camera so Marion is again
facing you.
- To trim the Start curves in the front,
do the following:
- Select
Hair > Modify Curves > Lock
Length. This allows you to manipulate the curve while
maintaining the curve’s hull length.
- Click the in the Status
Line to display the curves’ CVs.
- Using the Lasso Tool , select
CVs in an inverted U-shape around the front of Marion’s face, as
shown in the following image.
- Press Delete to remove the selected CVs.
- To curl under the ends of all the Start
curves, do the following:
- Click the button
to display the curves and then drag around Marion’s head to select
all the Start curves.
- Click the button
to display CVs and then, using the Select Tool, select
the CVs in the bottom half of all the curves.
- Select
Hair > Modify Curves > Bend > .
- In
the Bend Curves Options window,
set Bend Amount to 0.5 and Twist to 1.0
and then click Bend Curves.
The selected CVs are
bent under towards Marion’s neck. To fix any unruly hairs, you could
select them and then select
Hair > Modify Curves> Smooth.
- Click
the button
to display the curves.
- Change the display to include the Start
curves and the Current Position. (
Hair > Display> Current
and Start.)
- Click the Play button
to play the hair simulation.
Even though you styled
the Start curves, notice how they fall straight and lose the bend
at the end. Start curves only define the position of the hair at
the Start frame of the simulation; once the simulation is started
the Start curves are affected by the dynamic forces applied to the
hair system. To “hairspray” a hairstyle, you need to style Rest
curves and adjust dynamic hair system settings. In the next steps
you create Rest curves from the Start curves.
- Click the Stop button
to stop the simulation.
To create
and modify the Rest curves to achieve a hairstyle
- To create Rest curves from the shaped
Start curves, do the following:
- To see the new Rest curves, select
Hair > Display> Current
and Rest.
- Select
all the hair curves and then click the Play button
to play the simulation. Watch how the Current position hairs flop
down because the Gravity value is quite high
(2.5).
- To see what the hair would look like
without any gravity, go to the Dynamics section
in the hairSystemShape1 tab and change the Gravity value
to 0.
Watch the hair try to
achieve the Rest position.
- After the hair reaches the Rest position,
change the Gravity value back to 1.0.
- As
the hair starts to fall due to gravity, increase the Stiffness value
to 0.2.
If
some Rest curves won’t relax and stabilize, increase Length
Flex and Iterations in the hairSystemShape1
tab.
- Once the hair stabilizes, click the Stop button
to stop the simulation.
- You can further “hairspray” the curled ends
of the Rest curves using the Stiffness Scale attribute.
The curve in the Stiffness Scale graph illustrates the
amount of stiffness applied along the hair curve from root (left
side of the graph) to tip (right side of the graph). Go to the Dynamics section
in the hairSystemShape1 tab and change the Stiffness
Scale attribute as shown in the following image. These
changes add more stiffness to the end of the hair, which will hold
the bend more firmly.
- Play the simulation to see the effect
of the changes to Stiffness Scale.
- Stop the simulation once the hair relaxes
as in the following image.
- To reset the Start curves from the simulation,
select
Hair > Set Start Position> From
Current.
- Click the button
to rewind to the beginning of the simulation.