Zoom / Radial Blur COP

[kleer001]

Getting a zoom blur or spin blur in a COP network means writing the same wrangle: work out the aspect-corrected @P coordinate space, build the radial sampling loop, use volumesamplep so alpha doesn’t drop. It’s 30 lines of boilerplate for a basic result.

Zoom / Radial Blur COP is that node. Connect an image, pick a mode, done.

Blur modes: Zoom Blur (radial scale streaks from center) or Radial Blur (spin/arc smear at constant radius)
Center control: Screen Space (−1..1, 0 = image center) or Pixels (absolute coordinates, Y=0 at bottom-left)
Samples: 1–256, slider with strict minimum — raise for finals, lower for layout speed

Both modes share the same center controls. Switching modes hides the irrelevant parameter (Blur Pixels vs. Blur Angle). Alpha is preserved throughout via volumesamplep.

docs and download: https://kleer001.github.io/funkworks/zoom_blur_cop [kleer001.github.io]

Houdini 20.5+, any edition.
FX users: a build script is included to compile the HDA clean under your own license.

More free tools at FunkWorks Home [kleer001.github.io].