Ticket #3834 - Loss of coordinate systems during .stp (AP214) import/export

[easyw-fc]

The LCS should be then moved inside a Part

imported-w-LCS.png (84.23 KiB) Viewed 1902 times

It would be nice to have it in an Import/Export STEP code ...

[wmayer]

issue #3834

[whocares]

Great, i really appreciate your work.
I know this is not make a wish, but if the implementation is possible,
these Features wouldt be awesome too.
Add, move, orient, copy, name/rename and of course export these datum planes to a Step AP214.

For re/orientation i tried this -> plm.Placement.Rotation=App.Rotation(0,90,0,0)
and it worked so far.

Again, thank you!

[whocares]

Hello,
any News on this issue ?

[easyw-fc]

issue #3834

Hii wmayer,
would it be possible to switch from "App::Placement" to "PartDesign::CoordinateSystem"?
That would allow to work with assembly 4 approach, which is using "PartDesign::CoordinateSystem" to make assemblies...

Code: Select all

plm=App.ActiveDocument.addObject("PartDesign::CoordinateSystem","CSW")
plm.Placement.Base=App.Vector(31.8244952147467,33.7921260930763,-162.824495214746)
plm=App.ActiveDocument.addObject("PartDesign::CoordinateSystem","MCS")
plm.Placement.Base=App.Vector(15.925,31.8500000000002,-82.48178698)
plm=App.ActiveDocument.addObject("PartDesign::CoordinateSystem","PCS")
plm.Placement.Base=App.Vector(7.105427357601E-15,1.04449782156735E-12,1.4210854715202E-13)

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Moreover would it be possible to consider both import and export this LCS within STP?
Thx in advance
Maurice

exportwithnamedplanes-fc.FCStd

(13.71 KiB) Downloaded 42 times

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stp-with-LCS.png (79.85 KiB) Viewed 1784 times

[wmayer]

Moreover would it be possible to consider both import and export this LCS within STP?

Some months ago someone with a commercial CAD system already asked for this feature. It's listed in the bug tracker.

[whocares]

Hi, any Updates on this issue?
Kind regards

[realthunder]

I browsed through the OCC source code about this. I think it is quite doable. I'll add that feature once I got time.

[Kunda1]

Added ticket # to thread title and assigned ticket to @realthunder

[realthunder]

Copy my response from the other thread.

The STEP Axis information is part of the GD&T section. I did some research on how various other CAD handles this. I think FC is almost a blank in this area at the moment. Someone did a GD&T workbench some while ago based on Draft dimension, but was abandoned. And based on the look of the code, I decided not to continue the work. Instead, I plan to add basic GD&T support directly in Part workbench, maybe based on the existing Part measurement, to make them editable object and so on. But that is likely going to wait till the next release.

BTW, in case any one think its high priority and want to step in, you can checkout OCC source file XDEDRAW_GDTs.cxx, function DumpGDTs() to see how to extract various datum information from a XCAFDoc, which is what OCC imports STEP into.