9. Interpolation

Interpolation is a powerful concept in animation. At its core, it's the process of filling in the in-between stages of an animation to produce smooth transitions between keyframes. Here's a dive into how it works and the benefits it offers.

1. Introduction to Interpolation

• A fundamental principle in animation, used for creating intermediate frames.
• Allows for smoother transitions between two keyframes.

2. Auto Interpolation

• Automatically generate interpolation frames between two keyframes.
• Only an option if the two keyframes are very similar to each other.
• It's not frequently used but can be a timesaver in certain situations.

3. How to Use Auto Interpolation

1. Create an initial shape, such as a circle.
2. Move or modify that shape in a subsequent keyframe.
3. With multi-frame switched on, select both keyframes.
4. Choose the 'interpolate' option from the grease pencil dropdown in Edit mode to automatically generate the in-between frames.

4. Things to Keep in Mind

• Ensure consistency in the vertices. The start and end keyframes should have the same number and type of vertices for effective interpolation.
• While the tool may seem simplistic, if used correctly, it can produce surprising results. However, deviations in shape or complexity can result in unexpected outcomes.

5. A Practical Example

Even with slight variations in shape, the interpolation tool may still work, but it's not always guaranteed. In instances where you expect it to falter, it might just surprise you. However, always proceed with caution and ensure backup for your keyframes before experimenting.

6. Summary

Interpolation is a significant time-saver, especially in animations with consistent and simple shapes. But, as with all tools, it requires an understanding of its limitations. Mastering this can save countless hours in creating intricate animations.