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May be you can compute a vector field with a direction along the tube and some noises to create point trails procedural_roots_000.hiplc

Thank you again for reaching out Tesan, in the end the solution, AS EXPECTED, was terribly straightforward: a- correctly spelling in the blast node: @id=`detail("../metadata","iteration",0)` (i was missing the back ticks, stupid me, so the blast node wasn't reading it properly); b- adding a second block begin (if you lay down a for each number preset, you'll get it right away) and set it to fetch input and make it stream down to block end of your loop, and then attach the blast node from a-, so that it keeps the correspondent piece/iteration only, so now you can reference it to whatever you want to do in your "main" stream of the loop. I'm just writing it down so that anybody in the future will solve the problem, still, thank you for you effort!!!! Best wishes!

You can spherify a grid based on its bounding box using VOP's 'from polar'-node. spherify_grid.hipnc

Just a detail but as is, the bend values don't reflect the actual bending proportions. (bend1 angle x1 bend2 angle x2) If you constrain the capture length to the grid size, then you get correct proportions, and most importantly you can change the grid size freely Grid_to_Sphere F.hiplc