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VfxFloatEasingDriver

16.4

Inheritance 2 ancestors · 24 siblings

Class Documentation

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A float driver that returns an easing curve over a time source. On every evaluation:

  1. If duration is 0 or less, the driver writes nothing.
  2. The driver reads the time source frequency.
  3. If the time is greater than duration, the driver takes the remainder of the time divided by duration. So the curve repeats every duration.
  4. The driver divides the time by duration, clamps the result to 0-1 and applies EasingFunction to it.

Most curves go from 0 at the start of a period to 1 at its end. A time exactly equal to duration is not wrapped and returns 1, and a negative time returns the value at 0.

Properties

Easing

U8 = 0
Removed in 16.5
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EasingFunction

U8 = 0
16.5
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The curve shape. t is the time divided by duration, clamped to 0-1. Every listed shape returns 1 at t = 1. Each InOut shape runs its In shape over the first half of the period and its Out shape over the second half.

Value Name Result
0 kLinear t
1 kSnap 1 for every t
2 kSmoothStep t * t * (3 - 2 * t)
3 kSmootherStep t * t * t * (t * (6 * t - 15) + 10)
4 kQuadraticEaseIn t * t
5 kQuadraticEaseOut t * (2 - t)
6 kQuadraticEaseInOut ease in to the middle, then ease out
7 kCubicEaseIn t * t * t
8 kCubicEaseOut (t - 1)^3 + 1
9 kCubicEaseInOut ease in to the middle, then ease out
10 kQuarticEaseIn t^4
11 kQuarticEaseOut 1 - (t - 1)^4
12 kQuarticEaseInOut ease in to the middle, then ease out
13 kQuinticEaseIn t^5
14 kQuinticEaseOut (t - 1)^5 + 1
15 kQuinticEaseInOut ease in to the middle, then ease out
16 kSineEaseIn 1 - cos(pi * t / 2)
17 kSineEaseOut sin(pi * t / 2)
18 kSineEaseInOut (1 - cos(pi * t)) / 2
19 kCircularEaseIn 1 - sqrt(1 - t * t)
20 kCircularEaseOut sqrt((2 - t) * t)
21 kCircularEaseInOut ease in to the middle, then ease out
22 kExponentialEaseIn 2^(10 * (t - 1)), and 0 at t = 0
23 kExponentialEaseOut 1 - 2^(-10 * t)
24 kExponentialEaseInOut ease in to the middle, then ease out
25 kElasticEaseIn an oscillation that grows toward the end
26 kElasticEaseOut an oscillation that decays from the start
27 kElasticEaseInOut ease in to the middle, then ease out
28 kBackEaseIn t^3 - t * sin(pi * t): drops below 0 before it rises
29 kBackEaseOut the mirror of kBackEaseIn: rises above 1 before it settles
30 kBackEaseInOut ease in to the middle, then ease out
31 kBounceEaseIn the mirror of kBounceEaseOut
32 kBounceEaseOut a series of bounces that settle at 1
33 kBounceEaseInOut ease in to the middle, then ease out
other - 0

The Elastic and Back shapes leave the range 0-1 between the ends.

duration

F32 = 1
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Length of one period of the curve, in the units of the time source: seconds for the sources 1, 3 and 7, a fraction for the others.

looping

Bool = false
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Not read. The curve repeats whatever the value is.