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So I have three splines (3 vertical lines for example) and I want to make them cylinders with different randomized profiles. enter image description here

enter image description here

This is the basic idea of what I have. I want with every repeat to spawn a cylinder of random radius on one of the splines, not on every one. (I know this can be done easily by making three separate curves, but my set-up requires a loop to generate a random profile. I pick random length segments of the curve multiple times and make a random-radius profile mesh. I just need to do it on each spline separately so they look different)

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  • $\begingroup$ Do everything inside the loop, including the line creation. $\endgroup$ Commented Feb 18 at 18:33
  • $\begingroup$ I plan to apply quite a lot of transformations on the curve before meshing it, I would really like to avoid putting all that in a loop if possible. There has to be a way to modify splines in a curve separately. I tried doing it by id but couldn't find a set-up that works. $\endgroup$ Commented Feb 19 at 3:21
  • $\begingroup$ Similarly to what you did with the random ID, you need to have an index (which could actually be the ID) to use a "separate geometry" node (so you can take a single spline to work on). Currently you're modifying all splines at once, more than once. You may also need to realize instances since you created the splines via instancing. $\endgroup$ Commented Feb 19 at 5:38
  • $\begingroup$ Thing is I want to apply the transformation multiple times per spline, just not on all of them at the same time, so that each spline is unique. I don't want to create a new spline each time. I tried realizing the instances and separate geometry, but I can't figure out how to control the selection of Separate Geometry node so it cycles through the three splines each loop. $\endgroup$ Commented Feb 19 at 6:14

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A suggestion to avoid loops:

Example

Nodes

You can make use of the spline index (index evaluated on spline domain) to get random values or make calculations instead of separating each in a loop.

  • Height:
    • By selecting only the end points (with the endpoint selection node), you can change only the end point positions
  • Radius:
    • Each point on a spline has a "radius" attribute, which is 1 by default
    • If you "Set Curve Radius", you can use a circle of radius 1 and it will be multiplied by the spline point radius attribute
    • Index connected to "Evaluate on Domain: spline" take the index of each spline instead of the point indices
    • With the indice of the spline as ID, you can take one random number per spline
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  • $\begingroup$ It is cleaner this way for this example, but I use loops for the transform in my project (random arc section, thanks again for that one too). Would've been too clustered so I tried to showcase the problem with an easier example. $\endgroup$ Commented Feb 19 at 14:26
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Ok, so I got it working. I added a Separate Geometry node before the transformation. As for the Selection, a Compare node set to equal, did the trick. As one input I used an Index node, I don't know why but it wouldn't work with the index from a Spline Parameter node. Now with each loop it applies the transform to only one spline, iterating through them for a constant number of transforms/spline. Thanks again Daniel!

Picture if needed: Geo nodes for individual looped transform on splines in curve

Be sure to set Separate Geometry to spline and realize the instances before looping.

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