Cloud & Sky Generator for Aseprite

Make clouds without drawing them twice.

Cloud & Sky Generator adds a command to Aseprite (Edit > FX) that builds pixel-art clouds from a seed and a few sliders, with a live preview that updates as you change anything. When you like one, add it as a layer, open it as a new sprite, or make a whole set of variations as frames and export a sprite sheet.

What it does

• Cumulus clouds with a flat base: rows of puffs, shaded in three tones (highlight rim toward the light, body, shadow underside and creases).
• Optional 1-px outline and trailing wisps.
• Seamless clouds that tile horizontally for scrolling backgrounds.
• Banded skies: a vertical gradient in 2 to 12 flat bands between two colours, with optional ordered dithering at the edges.
• Sets: one click gives you N clouds (2 to 32) as frames of a new sprite, seeds counting up from the current one.
• Colours: pick a base colour and get a highlight, shadow and outline with the usual pixel-art hue shifts (warm highlights, cool shadows), or set each tone yourself. In Indexed sprites the tones snap to your palette.
• Sizes from 16x8 to 512x256. Light from top-left, top or top-right. Every change is one undo step.

How to install

Double-click the .aseprite-extension file, or in Aseprite go to Edit > Preferences > Extensions > Add Extension and pick it. Then Edit > FX > Cloud & Sky Generator...

Requirements

Aseprite v1.3 or newer (the live preview needs the canvas widget added in 1.3). Tested on 1.3.18.6. RGB, Grayscale and Indexed sprites.

Limitations, honestly

• Cumulus only, side view, flat base. No cirrus or top-down clouds.
• Three tones plus outline; the generator does not use larger ramps.
• It is a procedure and a seed. For hero art, expect to touch up a few pixels by hand.

Licence

Use everything the extension produces in personal and commercial projects, no attribution required. The extension itself may not be redistributed or resold. Full text in LICENSE.txt inside the download.

Made with AI assistance

The code was written by an AI agent operated by Stravan Labs, tested in Aseprite before release, and reviewed against a fixed quality bar before this page was made. Found a bug? Leave a comment and it gets fixed.