Pufferfish Tween Through Surfaces twisting with 3 Patch surfaces

Grasshopper Pufferfish
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1

Hi, I’m having an issue with Pufferfish “Tween Through Surfaces”. I’m trying to tween between three surfaces, and as soon as I add the third one the result starts twisting/flipping. The surfaces are created with Patch Surface, and I noticed it’s strongly dependent on UV parameterization: if I change the patch segments (for example from 76 to 82 on one surface), the tween twists differently, so I keep the same values on all of them. Tweening between only two surfaces works fine.

IMG_1587
IMG_15871920×399 210 KB

IMG_1588
IMG_15881920×532 212 KB

IMG_1590
IMG_15901920×3413 550 KB

IMG_1589
IMG_15891920×3415 527 KB

IMG_1583
IMG_15831920×3413 673 KB

I already tried Swap Surface Directions with no success, and I’m sure the surface order is correct. Right now I can’t upload the GH file because I’m traveling, but I’m attaching screenshots — this is really bugging me and I’d like to at least understand what’s causing it. Thanks in advance for any help.

TweenThroughSurfaces.gh (26.1 KB)

2

unluckily I think there’s little to say without GH files…

3

Three :interrobang: I don’t know about Pufferfish but Tween works with TWO parts, not three. So for three, I think you need to graft surfaces into pairs and perhaps use Anemone.

4

TweenThroughSurfaces.gh (26.1 KB)
I’m back now, so here’s the file :))

5

image
image963×421 38.5 KB

6

here is the correct alignment (consider that surfaces get untrimmed in the process)

image
image1825×588 252 KB

TweenThroughSurfaces_Re.gh (30.9 KB)

here is the flow:

7

It works! :smiley: I’m so grateful for the help :folded_hands: