Multiple PCG Spline Meshes with Offsets break flush ends

[ArghCrazy]

Edit - i think i figured this out. below is the answer.

So basically, if you do a spline. have 1 mesh in the Center. then want to add meshes offset on the Y-Axis so you end up with the example picture of a road with sidewalks.
But notice the sidewalk isn’t flush with the road. The outside sidewalk is longer and the inside is shorter. which kind of makes sense but it doesn’t.

I achieved the offset using simple transform points.

EDIT - I overcomplicated this.
A fix I did come up with was to just filter out the first (or last for the other side) 2 control points. resample them with 0 subdivisions. and reinsert them. But this will only work if the meshes have the same distance increments, but it does work if that if thats not an issue.

Edit - The answer -
Instead, you literally just have to
Get Spline Data -
Sample Spline (any mode, distance/subdivision/samples) -
Create Spline -
Sample Spline (using subdivision mode with 0 per segment).
Then continue with offsetting.
and it fixes this. I believe it may even fix this with different sized increments ( i haven’t fully tested). which to me is insane. but it works. the only downside being it will slightly (<1) change your distances.

Edit - This idea is unnecessary now.
In the level viewport you can fix the issue by simply adjusting the tangent of the spline end points. it is extreamly tedious and would have to be with exact precision to get it perfect. so I imagine theres some way to calculate it in the pcg graph. but i dont know what that would be.
Any ideas?

[BRGEzedeRocco]

Hello @ArghCrazy ,

I don’t know much about PCG, but I did a bit of research and found this tutorial that might help you achieve what you’re looking for.

Creating a Procedural Road with Spline Sampler in Unreal Engine 5.5 #unrealengine #pcg #tutorial

I also found a few posts about creating Parallel Splines, which I thought were quite interesting and related to the issue you’re describing. They might serve as a useful reference or give you some ideas for implementing a solution.

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I’ve been trying to create parallel spline in blueprint, I was able to create parallel spline points, but don’t know how to correctly set the tangents, because spline sections between points are not parallel (white and pink line in picture 1) to the root spline. How can I fix it, please? Thank you for your help;)

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I am trying to create a spline with parallel points and tangents. I managed to make the points parallel, but I don’t know how to adjust the tangent scale, so the curves are not parallel. I’ve also tried scaling based on curvature, but the results are unsatisfactory. Is there anyone who is good at solving problems like this? [Curve] [Curve_Fix]

Hope it helps!