Tweencel for Aseprite

Tweencel - Advanced Tweening and Animation Control for Aseprite

Tweencel  is an Aseprite extension inspired by Godot’s tweening system, bringing a familiar and powerful workflow into pixel art animation.

It lets you create smooth transitions between frames with advanced controls for precision. Adjusting position, rotation, scale, or even color (HSLA).

While tools like Tween Machine and others also explore tweening in Aseprite, Tweencel was built to capture the flexibility of Godot’s approach, making your animations more fluid and dynamic.

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✨Key Features

 🌀 Easing Options

Choose from various easing functions like Linear, Ease In/Out, Bounce, Elastic, or custom swaying to control how the animations transition between frames.

📐 Transform Tween

• Tween Position: Interpolates the position of your sprite between frames.
• Tween Size: Gradually adjusts the size of your sprite.
• Tween Rotation: Smoothly transitions the rotation of your sprite.

Note: Rotating big images takes few seconds to process, so just wait for it to load.

🪄 Motion Path Options

Choose how your sprite moves between frames, beyond just straight lines:

• Straight - Basic linear interpolation.
• Arc - Adds a jumping arc or bounce feel to the motion.
• Wave - Wavy sinusoidal movement in any direction.
• Triangle (Zigzag) - Sharp snappy zigzag patterns using triangle waves.
• Shake - Random jitter for camera shake or chaotic motion.

 🏀 Squash & Stretch Support

Add cartoony energy and elasticity to your tweens. Enable squash and stretch to exaggerate motion dynamically, automatically adapting to the direction of movement:

• Horizontal motion - wider and flatter stretch
• Vertical motion - taller and thinner squash

This adds personality and physics-inspired realism to your sprite animations.

🏳️‍🌈 Color Tween

Use the slider to directly adjust the image, just like how you use Hue/Saturation in the default settings.

• Tween Hue: Adjusts the hue values of the sprite for color shifts.
• Tween Saturation: Gradually increases or decreases color intensity.
• Tween Lightness: Controls brightness transitions.
• Tween Alpha: Tweens the sprite's transparency.

⚙️ Extra Settings

• Expand Canvas:  Expand canvas to give you more space to do tweening off original canvas size
  
• Reverse Order: Reverses the tweening sequence, letting you create effects in reverse.
  
• New Layer: Places the generated tween cels in a new layer, keeping your original layer untouch.

🛠️ Create and Update Tween Buttons

• Create Tween Cel: Generates intermediate frames based on your tweening settings.
• Update Tween Cel: Modifies existing cels or tweens or updates their properties without starting over.

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🔧 How to Use:

1. Open Tweencel - Navigate to Edit>Tweencel in the top menu
2. Choose from one of the easing options
   
3. Select Your Cels:
   1.     You can select a specific range of cels.
   2.     Alternatively, select an entire layer to include all its cels.
4. Prepare the First and Last Frames:
   1.     Ensure there is an image in both the first and last frames of your selection.
   2.     These two cels will act as the start and end points for your animation.
5. Apply Tween:
   1.     Create Tween Cel Button:
      Tweencel will automatically generate the in-between frames based on your selected tween option.
   2.  Update Tween Cel Button:
       Allows you to modify an existing range of tweened cels without starting from scratch. This is perfect for making adjustments to your animation after it has been created.

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💬 Feedback & Support

I’d love to hear your thoughts and see how you’re using Tweencel in your projects! Drop a comment or contact me directly for questions, suggestions, or just to share your amazing art.

If you find this tool helpful, I'd really appreciate if you could take a moment to leave a rating. Thanks a lot!

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📜 See Also

🎨 Art Assets

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Tweencel License Agreement

By downloading or using the Tweencel extension, you agree to the following terms:

1. Personal and Professional Use: You may use Tweencel freely for personal, professional, and commercial projects.
2. Restrictions:
   • You may not re-sell, copy, transfer, or distribute this extension, in whole or in part, without explicit written permission from the creator.
   • You may not modify and re-distribute the extension or claim ownership of the extension or any of its parts.
3.  Liability: The creator of Tweencel is not liable for any damages or data loss resulting from the use of this extension. Use it at your own risk. By using the script included with this file, you understand that you are using it AS IS with no guarantees. Although the extension is not intended to cause harm, no warranty is provided. Please remember to save your work regularly.
4.  Attribution: If you share content created using Tweencel, attribution is appreciated but not required.
5. Modifications: You are free to modify the extension for personal use only. Sharing or distributing modified versions is prohibited.
6. License Revisions: Devkidd reserves the right to revise this license as needed. Revisions apply to new downloads or updates only and do not retroactively alter terms for previous users.

Simple Usage License / Rights © Devkidd 2024-2025. All Rights Reserved.