The Spin Operator produces a dynamic effect that usually
occurs when an object is experiencing a force that has an offset from
its pivot point. This also includes objects sliding on a plane, since
they too can create rotational motion around any axis.
ON - (Bool) This input data
stream determines whether the operator is considered 'on' or 'off'. You
can connect other operators to this input channel such as a Bool
Helper to activate/deactivate the whole operator.
Time - (Time) This input data stream is used to define the local
time for the operator when the user wants to override the default system
time.
Particle - (Particle) This input data stream reads in the currently
selected particle group that is to have its particles be affected by spin
forces. The data stream MUST be connected and will be
highlighted yellow if it is not.
Rotation - (Rotation) This input data stream sets the absolute
rotational value of the particle. The rotation is performed around the
axis selected below in this operator.
Attack Time - (Frame) This input data stream is used to override
the Attack Time spinner value.
Spin Time(s) - (Scalar) This input data stream is used to override
the Spin Time per second spinner value.
Spin Time Variation - (Scalar) This input data stream is used
to override the Spin Time Variation % spinner value.
Phase - (Angle) This input data stream is used to override the
Phase deg. spinner value.
Phase Variation - (Scalar) This input data stream is used to override
the Phase deg. Variation % spinner value.
Bearing Friction - (Scalar) This input data stream is used to
override the Bearing Friction spinner value.
Speed Dependence - (Scalar) This input data stream is used to
override the Speed Dependence spinner value.
Size Dependence - (Scalar) This input data stream is used to override
the Size Dependence spinner value.
Axis Type - (Integer) This input data stream takes an integer
value that represents the Type of Axis that will control the particles'
spin. Valid input values are 0 through 2, where:
Axis - (Direction) This
input data stream is used to override the three Axis spinner values. This
value is only used when the Axis Type is set to User Defined.
Axis Variation - (Angle) This input data stream is used to override
the Variation deg. spinner value.
No Operator Outputs.
Use this rollout menu to control the Spin effect of a particle.
Attack Time - Increase this
spinner's value to give the particles a little bit of reaction time before
they reach their full spinning speed. The value is set in frames.
Spin Time [s] - This parameter
sets the amount of time it takes to do a full 360 degrees rotation for
each single particle. For example, a value of 10 for example will make
the particle do a single revolution in 10 seconds. Lower values will produce
faster spin rates, while higher values will create slower spinning.
Variation % - Increase this value to assign different spinning
speed rates to each particle. Higher values will add more variety to the
spin speeds between particles.
Phase deg - This spinner sets the starting angle for a particle.
Usually the spin of a particle starts at a 0 degree angle. You may shift
this starting angle with the help of the Phase parameter.
Be aware that this angular setting is only applied at the birth time of a particle.
Variation % - Increase this
value to assign a different phase value to each single particle. Higher
values will add more variety to the angular phase when particles are born.
Bearing Friction - This spinner value sets the time it takes until
the particle starts spinning.
NOTE: This value is only used when any of the Dependence
values are set to a non-zero value. Higher values increase the time it
takes to start spinning while lower values do not have as much effect
on the time it takes to start spinning.
thinkingParticles is able to simulate real world effects like spinning
particles or objects. Imagine an exploding car - heavy parts (like the
engine block) need higher energy values to get accelerated by the blast
wave while smaller parts such as doors, screws, tires, debris and so on
receive a much higher angular acceleration from the same blast.
Therefore, the two Dependency types like you connect the spinning speed
of a particle to the size of the particle or even the actual particle
speed. The idea behind this feature is that usually bigger parts (size)
are heavier than smaller parts and also faster moving particles are lighter
than slower moving particles.
Speed - This spinner controls how much dependence the spin speed
has on the velocity of the travelling particle. Faster particles will
spin faster than their slower moving counterparts. A value of 1.0 will
make the spin speed fully speed dependent. All values higher than 1.0
will act as a multiplier for the spin speed dependence.
Size - This spinner controls how much dependence the spin speed
has on the relative sizes of the particle. Smaller particles will spin
faster than their larger counterparts. A value of 1.0 will make the spin
speed fully speed dependent. All values higher than 1.0 will act as a
multiplier for the spin speed dependence.
Choose the spin axis that you want to use for your DynamicSet from this
drop down list.
Random - Choosing this option applies a random axis to each particle
as it is born for spinning.
Direction of Travel - Choosing this option creates a spin axis
that is perpendicular to the direction the particle is traveling. This
is good for things like bullets, where you want the particle to be spinning
and not tumbling end over end. A good way to visualize the direction of
travel is to select the particle Group in the Particle Group Tree View
and set the display to Drops. This will show you the relative paths each
particle is taking.
User Defined - If you need to set a specific spin axis for each
particle, you can do so by choosing this option. When you choose this
option, the three axis spinners become active so you can set the axis
manually. By default, the particles rotate around their local Z-Axis (0,0,1).
If you want to spin the particles around their Y-axis you would set the
parameters to 0,1,0 and so on.
Variation deg - To prevent all particles from spinning around
the exact same user defined angle, use this spinner to increase the angle
variation.