STEP short names format

Adrian Helcman's picture
Adrian Helcman
Tue, 01/21/2020 - 13:49
Forums: 
Data Exchange and Application Framework

hello,
attached step file, which uses the short names step format, is imported by import/export sample (oc 7.4) 1000x scaled (oc7.4.png).
the same file loaded to cad assistant (oc 7.4.1.dev) is shown in correct dimensions (cada.png, cada2.png).
would anybody explain, why oc 7.4 has this scaling problem? 
best regards,
adrian
 

Attachments: 
Binary Data 149.8_x_2_xx.stp
Image icon oc7.4.png
Image icon cada.png
Image icon cada2.png
Kirill Gavrilov's picture
Kirill Gavrilov
Tue, 01/21/2020 - 14:33

would anybody explain, why oc 7.4 has this scaling problem? 

It is not OCCT itself, it is just an MFC sample, which has a bug in this dialog.
The tool sets display units (AIS_Dimension::SetDisplayUnits()), but doesn't set model units (AIS_Dimension::SetModelUnits()), which are meters by default.
At the same time, STEP reader considers model units as millimeters by default ("xstep.cascade.unit" parameter).
So here is where 1000x scale factor appears.

Contributions to the proejct are welcome - you may prepare a patch or report an issue on Bugtracker:
https://dev.opencascade.org/index.php?q=home/get_involved