The Speed Vary behavior is useful for objects whose velocity changes at random as they move, such as sightseeing tourists. Its parameters let you specify how often a delegate should change speed, what speed range it should look at for a new speed, and how long it should accelerate to get to that new speed.
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Create panel > 
(Helpers) > Object Type rollout > Crowd > Setup rollout > Behaviors group > Click the New button. > Select Behavior Type dialog > Speed Vary Behavior
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Select a Crowd object. >
Modify panel > Setup rollout > Behaviors group > Click the New button. > Select Behavior Type dialog > Speed Vary Behavior
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Select a Crowd object. > Modify panel > Setup rollout > Behaviors group > Choose Speed Vary from the drop-down list.
Interface
Time group
- Period
- Specifies how many frames should elapse before a new speed is chosen.
- Deviation
- Specifies the maximum amount by which Period should vary.
Each time a period ends, character studio takes a random number between the negative and positive values of the Deviation setting, multiplies it by the Period setting, and adds the result to Period. Default=0.5. Range=0.0 to 1.0.
Speed group
The mathematical formula for the new speed is as follows: new speed = (delegate's Average Speed*Center)*(1 + RN*Center Deviation), where RN is a random number between –1 and 1.
- Center
- Specifies the speed the delegate should change to. Center is a multiplier: A value of 0.0 means to stop, a value of 1.0 means to move at its average speed, and a value greater than 1.0 means to move faster than its average speed. Default=1.0. Range=0.0 to 99,999.0.
- Deviation
- Specifies the maximum amount by which the delegate's calculated speed (Average Speed*Center) should vary.
Each time a period ends, character studio takes a random number between the negative and positive values of the Deviation setting, multiplies it by the calculated speed, and adds the result to the calculated speed. Default=0.25. Range=0.0 to 99,999.0.
- Accel Period
- Specifies the rate at which the delegate's speed should change in relation to the period length.
A value of 0.0 means that the transition to the new speed will proceed as quickly as possible, and a value of 0.5 means the transition will take half the period. A value of 1.0 means the transition will take the entire period. Default=0.5. Range=0.0 to 1.0.
- Deviation
- Specifies the maximum amount by which acceleration should vary.
Each time a period ends, character studio takes a random number between the negative and positive values of the Deviation setting, multiplies it by the Acceleration setting, and adds the result to Acceleration. Default=0.5. Range=0.0 to 1.0.
- Seed
- Specifies a value for randomizing the Speed Vary behavior.