After Reading the article about the clouds in RIO i thought of making a simple modelling tool that enables the artist to model the clouds in a easier way.Most of the cumulus clouds will have a tube (oriented in X axis) kind of structure which will be flat at the bottom.
Reference Image
The Basic idea is to scatter spheres on a tube whose radius will be controlled by the user with a Ramp which enables the artist to visualize the cloud's shape through the curves in the ramp.
In order to get the bumps and canyons another sphere is scattered over the previous one.So the tool has two layer Back to back with Two Ramps individually controlling the sphere radius.
Cumulus cloud Modeler-geometry
Cloud Rendered
Below is a small tool demonstration of cumulus cloud modeller
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