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IDProjectCategoryView StatusLast Update
0002245FreeCADBugpublic2016-08-12 11:35
Reportertarrow Assigned Towmayer  
Status closedResolutionfixed 
PlatformWindowsOS10OS VersionPro
Product Version0.15 
Fixed in Version0.16 
Summary0002245: BRep File cannot be written
DescriptionAfter editing and saving files, errors in Report View show problem with saving BRep files in the temporary directory. On reopening the file, parts are not being rendered and some are moved. Was working ok in Windows 8.1. It appears as if the data in the temp files are not being written to the saved file since it is smaller than the original. This is likely related to problem 0001211.
Steps To ReproduceOpen EngineBlock.FCStd in /data/examples/
Save File or Save As File
Numerous write errors appear in Report View window, such as:
Shape of 'Crankcase Billet' cannot be written to BRep file 'C:/Users/Bruce/AppData/Local/Temp/FCTA3CE.tmp'
Additional InformationThe file, after saving, with these errors is attached. I ran FreeCAD as administrator and this didn't help. The FreeCAD_xxxx.lock file appears in the temp directory so there shouldn't be a problem with write access.
TagsNo tags attached.
FreeCAD Information


duplicate of 0001211 closedwmayer ... cannot be written to BRep file ... Error on saving a model 
has duplicate 0002376 closed FreeCAD Unable to Save Files Properly 
has duplicate 0002666 closed Error on Save File 



2015-09-09 15:18


EngineBlock.FCStd (Attachment missing)


2015-09-09 22:04

administrator   ~0006376

There are many problems in that files that create problematic shapes... I guess some shapes cannot be written because their data is wrong...

Deleting the wrong objects (those marked with a red ! in the tree view) makes the file valid and, probably, savable again. I can't confirm because here I'm able to save your original file, even containing the errors.


2015-10-17 15:22

administrator   ~0006500

Last edited: 2015-10-17 15:23

I guess the problems are related to your HDD. When writing the project file then the shapes are tmp. stored in an extra file and then read back to be written to the zip file. And sometimes files are rather small and must be written and read very quickly.

In the API there is also a way to write/read everything directly. But the reason for the more complicated way is that there is no guarantee that the cad kernel is compiled with the same compiler version as FreeCAD. If this is not given the application will crash.

In the attached changeset there is now a way implemented to directly write to/read from the zip stream. In order to activate this go to the parameter editor and create under "BaseApp/Preferences/Mod/Part/General" the boolean key "DirectAccess" and set it to true.

Related Changesets

FreeCAD: master ad96714f

2015-10-17 17:13:27


Details Diff
+ issue 0002245: BRep File cannot be written Affected Issues
mod - src/Mod/Part/App/PropertyTopoShape.cpp Diff File

Issue History

Date Modified Username Field Change
2015-09-09 15:18 tarrow New Issue
2015-09-09 15:18 tarrow File Added: EngineBlock.FCStd
2015-09-09 22:04 yorik Note Added: 0006376
2015-09-09 22:04 yorik Status new => feedback
2015-10-17 13:43 wmayer Relationship added duplicate of 0001211
2015-10-17 15:14 wmayer Changeset attached => FreeCAD Master master ad96714f
2015-10-17 15:22 wmayer Note Added: 0006500
2015-10-17 15:22 wmayer Status feedback => closed
2015-10-17 15:22 wmayer Assigned To => wmayer
2015-10-17 15:22 wmayer Resolution open => fixed
2015-10-17 15:22 wmayer Fixed in Version => 0.16
2015-10-17 15:23 wmayer Note Edited: 0006500
2015-12-25 10:04 wmayer Relationship added has duplicate 0002376
2016-08-12 11:35 wmayer Relationship added has duplicate 0002666