QuickTime 4 Reference

Cloud

kCloudCodecType ('clou')

The cloud effect uses a fractal noise generator to simulate a cloud formation. This can be transparently overlaid on an image. The cloud formation's colors can be controlled, and the cloud randomly changes shape over time.

Example:

The cloud effect takes no sources and has two parameters.

Parameters

Use the descriptions below to help you understand what the parameters do. To learn how to use parameter atoms, see "Adding Video Effects to a QuickTime Movie"

Name	Code	QTAtom Type	Description
Cloud color	`'fgdc'`	`kParameterTypeDataRGBValue` Can be a tween	The foreground color of the cloud.
Background color	`'bckc'`	`kParameterTypeDataRGBValue` Can be a tween	The background color of the cloud.
Rotation	`'rotc'`	`kParameterTypeDataDouble` Can be a tween	The vertical rotation of the cloud around its axis. Legal range is 0 to 360.

Name

Code

QTAtom Type

Description

Cloud color

'fgdc'

kParameterTypeDataRGBValue

Can be a tween

The foreground color of the cloud.

Background
color

'bckc'

kParameterTypeDataRGBValue

Can be a tween

The background color of the cloud.

Rotation

'rotc'

kParameterTypeDataDouble

Can be a tween

The vertical rotation of the cloud around its axis. Legal range is 0 to 360.