Shift List Problem: points stacking on the seam

Hello forum,

I was doing this tutorial and everything was fine right until after the part with path mapper, this is what tutor has:

And this is what I have:

After all the manipulations with the graph mapper I've had to shift the list 4 items forward to match the overall point structure. But for some reason it didn't shift the points and the seam like I thought it would, also "nearest" to the seam points kept stuck together.

Here I show the original problem, you can see the cap is twisted and start/end points lie on the seam.

Is it a bug or did I do something wrong? Won't hide, path mapper is a bit tricky to understand, I could have screwed something up there.

Attachments:

Setting Up Geometry for Animation.gh, 15 KB

Replies to This Discussion

Permalink Reply by Vongsawat Wongkijjalerd on October 13, 2016 at 3:58am

I can kinda see what is going wrong I think?

The red seam gets counted twice (beginning and end), but its on the wrong side here.. So even when you Shift List (or the path mapping equivalent) you're never going to end up with the correct solution, as Path Mapper doesn't actually move any of the points around (and you've got double points in a place where you only want one)

The solutions I have are decidedly non-path-mapper related though..not sure if they are at all applicable for you sorry:
1) rotate the brep by 180 degrees.
2) get rid of the last point for all the breps, means you can Shift List without having to worry, and then
duplicate the first point and plonk it at the end of each list.

also, what is with that wormhole you've got just lying around there XD

Permalink Reply by Tim on October 13, 2016 at 4:10am

Thanks, Vonqsawat.

I was hoping to avoid extra steps and get an explanation for this problem. I think 'll stick to option 2, cull the duplicates and interpolate the surface from points component.

Still gonna wait for an explanation for a while, guy in the tutorial had everything fine, the ways of Brep generation are mysterious indeed.