reducing meshes and joining bodies ?

[diego.nunezM32NZ]

Hi, everyone im having trouble with a stl file, so im working on a backpack in fusion i was having trouble doing some curves, so i turned it into a obj and modified it on mesh mixer, everything seemed fine i exported back to fusion, i reduced to number of mesh iterations but when it converted to a b rep, my shape changed and i have this big chunks of triangles all over it, i tried to stick them together but that did not work, could someone help me get rid of those triangles, i will post both iterations of the model the original.

I screwed up the names, but the one that only contains 1 back pack is the original. (weighs 9513 kb)

Thanks

[LeonardoBN]

Hi, @diego.nunezM32NZ. What operations did you have to do in Meshmixer? Are they related to the curves you cited before?

[TrippyLighting]

I've looked at both files. Please help me understand: You took a design from FUiosn 360 which is constructed from BRep and NURBs surfaces and through .stl export turned it into a triangulated mesh(es)?

Here's a little primer:

.stl files were never designed to function as an input to a design process that requires accuracy. .stl files contain triangulated mesh data and initially were devised as output to the first stereolithography 3D printers. 

Note: This article does not cover quad meshes. 

Triangulated mesh files, in particular, have a finite resolution and lack topology in a mathematical sense. CAD geometry, on the other hand, is represented in the form of NURBS surfaces or  BRep containing analytic geometry and NURBS surfaces.

Those are mathematically precise, resolution free descriptions of 3D geometry and include topology.

When a triangular mesh is created from CAD geometry information is lost and cannot be fully re-created. 3D scanning also often is a source of triangulated mesh data.

Depending on how the triangulated mesh was created and the geometry described by it, reverse engineering precise geometry from a triangulated mesh is often not trivial and can require expensive software and the skill to do so.

[diego.nunezM32NZ]

i could not the strap of the backpack so i went into mesh mixer to created, and i thought i could be an easier solution but i guess it was not.