MotionDesigner Reference & User Interface > Motion Laws

Phase 1: Acceleration : first ½ wave of a Sine function

Phase 2: Zero Acceleration : Constant Velocity

Phase 3: Deceleration : last ½ wave of a Sine function : 25% of the Segment Width

You CAN specify the:

•Start-Position

The Start-Position usually flows from the End-Position of the Previous-Segment.

•End-Position

You CANNOT specify the:

•Start-Velocity, End-Velocity

•Start-Acceleration, End-Acceleration

•Start-Jerk, End-Jerk

Segment Parameters

Start-Fraction × 100 = % of Segment-Width to accelerate from zero-velocity* to maximum-velocity

End-Fraction × 100 = % of Segment-Width to decelerate from maximum-velocity to zero-velocity**.

Start-Fraction + End Fraction 1

Constant-Velocity % = 1- Start-Fraction – End-Fraction

* assuming Start-Range is zero

** assuming End-Range is zero

Segment-Range

Start-Range - remove the start of the Ramp Motion-Law

End- Range- remove the end of the Ramp Motion-Law

0 ≤ Start-Range < End-Range ≤ 1

1 x Ramp Segment, Symmetrical

Applications

Asymmetric Segments, in which the Acceleration is longer or shorter than the Deceleration.

Motion with a long displacement, in which the maximum-velocity is less than other motion-laws.

EXAMPLE : see image below.

In the example:

•Start-Fraction ≠ End-Fraction

•Start-Fraction = 0.7

•End-Fraction = 0.3

•Start-Fraction + End-Fraction = 1

• Constant-Velocity % = 0%

E.g.: RAMP Segment: Start-Fraction = 0.7, End-Fraction = 0.3
(Constant-Velocity Fraction = 0)