V7 [image] V8 [image] V9 [image] MAF.3dm (620.1 KB) ** sys info.txt (3.5 KB) **

hi @Piotr thanks for reporting, I logged: RH-83072 MergeAllCoplanarFaces is broken in Rhino 9 WIP ps: the object is an invalid Brep, but that is not why it is failing.

I thought it may be invalid by SelBad finds nothing.

SelBadObjects works here in 7 8 and 9 to flag that object.

What do you see if you run What on that object? I see: [image]

It is valid here: :sweat_smile: [image]

interesting… are you sure you’re looking at the same file you posted?

I’ve sent an V7export after copy-pasting it from V9. Strangely, it is valid in V9 on the whole scene and becomes invalid when opened solo.

I don’t remember how it was created but, for sure, Rebuild wasn’t involved.

Strange results of Merge All Faces

Serengeti (Rhino BETA)

davidcockey (David Cockey) July 22, 2024, 12:29pm 10

Could this be related to the mess that results in V8 and V9 when Rebuild is used on a single surface in a polysurface? Rebuild and sub-objects

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Strange results of Merge All Faces

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