yesbird wrote:

> Not sure that this is the most important thing to do now,
> but could you give an examples of the modern systems with adjustable
> precision and method they use to calculate it ?

(I wasn't making a value judgement about its importance or timeliness, I was
just making an observation.)

I guess various packages have "tolerance" and "decimation error" settings.

https://help.autodesk.com/view/PWRS/2025/ENU/?guid=GUID-465F277C-E3AE-4D83-B14E-0832137FCF4D

https://www.open3d.org/docs/latest/python_api/open3d.t.geometry.TriangleMesh.html


Simplify mesh by Threshold: This is an easy way to reduce the file size of a
mesh for manufacturing. This block will create the mesh with the least amount of
faces. A good starting point for the threshold is 1/4 to 1/8 of the
manufacturing tolerance.
Simplify mesh by Amount: This block generates a mesh that is smaller than the
original based on the specified amount. For example, a value of 0.9 will create
a mesh with 90% fewer faces, and as a result 90% smaller file size.
https://www.ntop.com/resources/blog/meshing-in-fea-cfd-manufacturing/

https://help.altair.com/inspire/en_us/topics/implicit/visualization_r.htm#:~:text=This%20is%20usually%20seen%20in,doing
%20this%20is%20shown%20below.

https://support.carveco.com/hc/en-gb/articles/19604059276316-3D-Design-Creating-Triangle-Mesh-For-Exporting#:~:text=The
%20two%20settings%20work%20hand,tolerance%20low%20and%20optimisation%20enabled.

https://nexus.hexagon.com/documentationcenter/en-US/bundle/VISI_2025_2_FLOW_Online_Help/page/Content/CadMeshTolerance.h
tml

Lots of search results for "triangle mesh decimation"

This would probably be the biggest file-size optimizer, because there's no
reason to have a cube with 10,000 coplanar triangle faces when 2 would
indistinguishably do the job - probably with more accuracy and fewer artifacts
to due to floating point noise.


How to calculate it?
Rounding and truncation, I would imagine.

> I see that C4D gives 14 digits (attached).

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