Smoothstep()

static constexpr Fxp SRL::Math::Interpolation::Smoothstep ( const Fxp & start, const Fxp & end, const Fxp & t )

inlinestaticconstexpr

Smoothstep interpolation for smooth acceleration and deceleration.

Implements Ken Perlin's smoothstep function using the formula: 3t² - 2t³

The smoothstep produces this behavior:

• Smooth acceleration from start
• Constant velocity at midpoint
• Smooth deceleration to end

Common uses:

• Camera transitions
• Smooth UI animations
• Particle system parameters
• Fade effects

Parameters

start	Starting value of the interpolation
end	Ending value of the interpolation
t	Interpolation factor, automatically clamped to [0,1]

Returns

Smoothly interpolated value

Note

Automatically clamps input t to [0,1] for safety