edwin wrote: ↑Tue May 10, 2022 21:15
It's all about playing around with UV coordinates.
I attached a patch that uses the UV Texture and UV Map nodes to implement a simple Blow effect.
The UV Map uses a UV Texture to determine where to sample the pixels. The red channel of the UV Texture determines the X coordinates and the green channel determines the Y coordinate.
By altering (in this case clamping) the red and green channels you can manipulate the x,y coordinates uses to sample the pixels.
BlowNoShader.zip
Blow.png
Edwin, would you know how to pull this off live? Presumably with an ISF?
https://www.instagram.com/reel/Cxib3gdM ... BiNWFlZA==
Where the Blow effect is radial, yet the sampled coordinates are the edges of an image regardless of shape.
This ISF does the simple radial Blow without the cool edge sampling:
https://editor.isf.video/shaders/159
I assume instead of using a circle shape (or solid line etc), you'd somehow mask a shape onto itself for the sample coordinates?
Curious your thoughts, thanks!