The S_Clouds filter comes from the Emmy award winning Boris FX Sapphire filter set.

Render.

To select a preset, pick one from the Presets window.

The effect is advanced in time.

The spatial frequency of the clouds. Increase to zoom out, decrease to zoom in. Very high values of Frequency are clamped internally so the grain size is no smaller than a few pixels.

The relative horizontal frequency of the texture. Increase to stretch it vertically or decrease to stretch it horizontally.

The number of summed layers of noise. Each octave is twice the frequency and half the amplitude of the previous. A single octave creates a smooth texture. Adding octaves makes the result approach a fractal (1/f) noise texture.

Used to initialize the random number generator. The actual seed value is not significant, but different seeds produce different results and the same value should give a repeatable result.

Translation offset of the texture. Since the texture is procedurally generated, it can be shifted with no repeating units or seams occurring.

Scales the brightness of Color1. Increase for more contrast.

The color of the brighter parts of the texture. The colors of the result are determined by an interpolation between Color0 and Color1.

The color of the darker parts of the texture.

Adds this value to color0. Decrease to a negative value for more contrast.

The image brightness is scaled by this value before being combined with the clouds.

Determines how the texture is combined with the Background.

Renders only the clouds texture with no Background.

The texture is multiplied by the Background.

The texture is added to the Background.

The texture is blended with the Background using a screen operation.

The result is the difference between the texture and Background.

The texture is combined with the Background using an overlay function.

Enables/disables the on-screen control for adjusting the Shift Start parameter.