Geometry
Spiral warp
A twist that grows toward the centre: straight lines become spirals.
Controls
- centre x
- A number from 0 to 1, 0.5 by default.
- centre y
- A number from 0 to 1, 0.5 by default.
- turns
- How many times the picture winds around the centre. The sign picks the direction
- radius
- How far out the swirl reaches. Beyond it the frame is untouched — every real whirlpool has an edge
- falloff
- How the swirl dies out towards that edge. Below one it holds almost to the rim and stops abruptly; above, it gathers into the middle