Enum ColorGradientStopInterpolation

Defines the interpolation curve applied to the transition between a ColorGradientStop and its successor. When set to None, the gradient's global interpolation behavior is used.

Namespace: Scylla.Core.Util.Palette
Assembly: ScyllaCore.dll
Syntax
public enum ColorGradientStopInterpolation
Remarks

Per-stop interpolation overrides allow fine control over individual transitions within a gradient. The easing is applied to the local t parameter between two adjacent stops after midpoint remapping, before the color space interpolation.

Curves follow the standard Penner easing taxonomy. In variants start slow and accelerate; Out variants start fast and decelerate; InOut variants are symmetric S-curves. Higher-order polynomials (Quad < Cubic < Quart) and Expo produce progressively stronger ease shapes.

Integer-value contract. Every member is pinned to an explicit integer value. These values are part of Unity's binary asset serialization for any ColorGradientAsset on disk, so renumbering or re-ordering existing members will silently corrupt every saved gradient. When extending this enum, always append new values at the next free integer and never insert between or re-use existing slots. A previous Phase-17 redesign re-shuffled the layout when removing the deprecated Linear value (which was behaviourally identical to None); the current layout has been pinned to lock the contract going forward.

Fields

Name Description
CubicIn

Cubic ease-in (t^3). Stronger acceleration than QuadIn. The default "ease" curve in many web and motion-graphics tools.
CubicInOut

Cubic ease-in-out. Symmetric S-curve with stronger acceleration than QuadInOut.
CubicOut

Cubic ease-out (1 - (1-t)^3). Stronger deceleration than QuadOut.
ExpoIn

Exponential ease-in (2^(10*(t-1))). The strongest meaningful ease-in. Useful for HDR bloom curves, blackbody-style hot tails, and neon glow falloff. t = 0 returns 0 exactly.
ExpoInOut

Exponential ease-in-out. Strongest symmetric S-curve in the standard family. t = 0 and t = 1 return their exact endpoints.
ExpoOut

Exponential ease-out (1 - 2^(-10*t)). Mirror of ExpoIn. t = 1 returns 1 exactly.
None

Straight-line blend with no easing applied to the local transition parameter. The transition still happens in whatever color space the gradient is set to (RGB, HSV, or Oklab); "no easing" only means no curve is applied to t. This is the default value.
QuadIn

Quadratic ease-in (t^2). Starts slowly and accelerates.
QuadInOut

Quadratic ease-in-out. Mirrors QuadIn for the first half and QuadOut for the second.
QuadOut

Quadratic ease-out (1 - (1-t)^2). Starts quickly and decelerates.
QuartIn

Quartic ease-in (t^4). Used for heavy "long shadow" or "hot highlight" ramps where most of the transition concentrates near one end.
QuartInOut

Quartic ease-in-out.
QuartOut

Quartic ease-out (1 - (1-t)^4). Mirror of QuartIn.
SineIn

Sinusoidal ease-in (1 - cos(pi * t / 2)). Gentlest meaningful ease-in in the standard family; reads as softer than QuadIn without any acceleration spike. t = 0 returns 0 exactly.
SineInOut

Sinusoidal ease-in-out (0.5 * (1 - cos(pi * t))). Gentle S-curve that reads as softer than SmoothStep without the slight mid-segment acceleration of the cubic Hermite form.
SineOut

Sinusoidal ease-out (sin(pi * t / 2)). Mirror of SineIn. t = 1 returns 1 exactly.
SmoothStep

Hermite S-curve easing (3t^2 - 2t^3). Smooth ease-in-out that starts and ends slowly with acceleration through the middle.
SmootherStep

Perlin's quintic easing (6t^5 - 15t^4 + 10t^3). Smoother than SmoothStep with C2 continuity.
See Also