"MergeAllCoplanarFaces" for Cylinders

[CarlosFilho]

Sounds like a stupid question, but I think it gives a better idea of what I want to accomplish.

If I have a cylinder, and I extrude it on its lenght, Rhino creates/mantains a “seam line” on the point from where the extrusion started:

If I explode the geometry, it’s not considered as a single surface:

And if I use UnrollSrf (just after the extrusion, or after re-joining the surfaces), it’s considerated as 2 different surfaces (this is my biggest problem, as I nees to unroll the cylinders).

Is there a command similar to “MergeAllCoplanarFaces” to fix the surface of the cylinder, or does anyone know another method? (rebuild I think is kind of dangerous because you don’t get exactly the same geometry as before)

[wim (Wim Dekeyser)]

Hi Carlos -

@CarlosFilho

Is there a command similar to “MergeAllCoplanarFaces” to fix the surface of the cylinder,

This feature request is on the list as RH-10693 MergeAllFaces work on degree 2 surfaces

@CarlosFilho

or does anyone know another method?

A script was posted here:

Script alternatives to MergeFace & MergeAllFaces

xBrep_mergeFace.py and xBrep_mergeAllFaces.py in rhinopython/for_xBrep_mergeFace.zip at master · CADacombs/rhinopython · GitHub are alternatives to _MergeFace and _MergeAllFaces, respectively, that besides planar faces, willl also merge conical, cylindrical, spherical, toric, and some other NURBS-surface faces (https://mcneel.myjetbrains.com/youtrack/issue/RH-10693). There is no installation; place all .py files in the .zip into a Module Search Path for Rhino Python, e.g., %AppData%\McNeel\R…

-wim

[davidcockey]

MergeSrf is the simplest method to merge two open cylinders into a single cylinder if the seams are aligned. If the seams are not aligned use Srfseam to move on of the seams until it aligns with the other.

[markleichliter]

Use Scale1D on your original cylinder?

[CarlosFilho]

Thank you, I tried it in some straight cylinders to see how it works, and it will be very useful.

I’m not sure why it doesn’t work on the following shape:

I tried both mergeFace and mergeAllFaces.

[CarlosFilho]

Sorry but I probably didn’t explain well. It’s not a straight cylinder. I wanted to give a quick example, but in my case it’s actually a bended tube.

[CarlosFilho]

I tried on another tube similar to this one and it actually worked so threre’s probably some problem with that geometry. Thanks for the help`!