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Assigning a Paint Effects brush to the hair
Lesson 2: Creating a dynamic non-hair simulation
Rendering the curtain scene
Setting up constraints
In
these next steps you tie up the middle section of the beaded curtain
by first modeling the Start curves into a bound position and then
creating a constraint to hold the curves in that position during
playback. With a Hair to Hair constraint the hair curves stick together
at the constraint locator, but also dynamically move from root to
tip when forces or collisions occur.
To
model the curtain into a tied-back position
- Dolly
and tumble in the scene until you are facing the curtain directly.
- Drag
to select all the hair curves and then select
Hair > Convert Selection >
To Start Curves.
- Select
a block of Start curves in the middle of the curtain.
- Select
Hair > Modify Curves >
Lock Length. This ensures the entire curve is modified when you
transform CVs in the next steps.
- Click the
button
on the Status Line to display the
CVs on the curves.
- Select
the middle three rows of CVs on the selected hair curves and then, using
the Scale Tool, scale the CVs inwards
so the hairs are pulled together.
To
constrain the curtain in the tied-back position
- Click
the
button
on the Status Line to display the
Start curves (not the CVs).
- With
the bound hair curves still selected, select
Hair > Create Constraint >
Hair to Hair.
A constraint locator is created and
connected to the selected curves.
- In
the hairConstraintShape tab in
the Attribute Editor, set the constraint attributes
as follows:
- Stiffness to
0.5 (default)
- Glue Strength to 1.0 (default)
- Point Method to Nearest
(default) (Since the constraint locator is created in
the middle of the bound hair, the locator is “nearest” the bound
area to be constrained.)
- Change
the hair display to the Current Position (
Hair > Display >
Current Position).
- Rewind
to the start frame and play the simulation.
When the sphere passes through the bound curtain
it collides with all the bound hairs.
The bound part of the curtain relaxes within
the first several frames, but in the next steps you reset the position
of those Start curves so they look more natural at the beginning
of the simulation.
To
reset the Start position
- Display
the Start curves and the Current Position (
Hair > Display >
Current and Start).
- Rewind
to the start frame and play the simulation.
- Stop
the simulation as soon as the curves relax below the constraint,
but before the collision occurs.
- Select
the bound Start curves (these are the bound curves that are not blue)
and then select
Hair > Set Start Position >
From Current.
You may have to repeat steps 2 to 4 a few times
until you are happy with the look of the bound curtains at the beginning
of the simulation.
