> ## Documentation Index
> Fetch the complete documentation index at: https://manimvtk.mathify.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Animations

> Creating custom animation classes

## Creating Custom Animations

Extend Animation class:

```python theme={null}
from manimvtk import *

class CustomAnimation(Animation):
    def interpolate_mobject(self, alpha):
        # alpha goes from 0 to 1
        # Modify self.mobject based on alpha
        self.mobject.scale(1 + alpha)
```

## See Also

<Card title="Animations Guide" icon="wand-magic-sparkles" href="/concepts/animations">
  Animation concepts
</Card>