Rendering effects

The following scripts dynamically update the fog, precipitation, and environment map settings used by the Dark Engine's renderer.

• KDTrapEnvMap
• KDTrapFog
• KDSyncGlobalFog
• KDTrapWeather

Transitions

The fog and weather scripts can provide smooth transitions between the old and new values. The transition parameter specifies the length of the transition. If that parameter is undefined or set to 0, the transition will be instantaneous. The curve parameter specifies the shape of the interpolated curve, from among the values below. (t is the progress of the transition in the range [0.0, 1.0], while α is the multiplier used to interpolate between the starting and ending values at that time.)

linear

Straight line: α = t (solid black line)

quadratic

Parabolic curve: α = t² (solid red curve)

radical

Radical curve: α = √t (solid blue curve)

log_10

Logarithmic curve (base 10):
α = log₁₀(0.9t + 0.1) + 1 (solid green curve)

pow_10

Power curve (base 10): α = (10^t - 1) / 9 (solid orange curve)

log_e

Logarithmic curve (base e):
α = log_e((1 - 1/e)t + 1/e) + 1 (dashed green curve)

pow_e

Power curve (base e): α = (e^t - 1) / (e - 1) (dashed orange curve)

The usual trap control flags, locking, and timing (before the start of the transition, not its length) are also respected by these scripts.