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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].

Damn that's beautiful, thank you so much Paul. Was still working on a few other methods but wasn't really able to figure it out still. Definitely going to study this setup :) Thanks again for taking the time

Definitely there're many ways, more or less procedural or mathematically correct. I tried first a more simple and flexible way. climbing_rope_v01.hipnc

Nowadays you would rather use the group expand node, though: https://www.sidefx.com/docs/houdini/nodes/sop/groupexpand.html group_expand.hip

Hi, another method is that this group you created is your preselect group, so lets assume to call it preselect. Now put down another group sop, set it to points, turn off the enable toggle on the first page, go to edge tab, turn it on. Turn on edge depth, and in the points group field choose your preselect group, then adjust your edge depth accordingly. I use this all the time.