STEP file not correctly importing

Coreform Cubit
#1

Coreform Cubit Version: 2024.3
Platform: Windows 11

Issue
I have a STEP file that contains many line segments. When I import this file into Cubit 2024.3 (first image below), it seems to be missing approxiamtely half the lines in the file. Importing the exact same file into Cubit 2021.5 (second image below) it imports correctly. Is this a potental bug?

image
image1063×869 13.9 KB

image
image970×830 17.7 KB

few-lines.stp (42.4 KB)

#2

Hi @johnsonha,
yes this looks like a bug. I will report this to the devs.

#3

Thank you @Norbert_Hofbauer.

I was also wondering if there was a way in Cubit to merge these line segments such that they are a single curve. I’ve tried using the Create Curve combine curve command with no success.

#4

Hi @johnsonha,
create curve combine curve all only works for connected chains of ACIS curves. In your step file they get imported as spline curves.

Here is a short example.

reset
create curve arc radius 1 center location   0 0 0 normal 0 1 0 start angle  stop angle  
split curve all fraction 0.5 from start 
split curve all fraction 0.5 from start 
split curve all fraction 0.5 from start 
split curve all fraction 0.5 from start 
create curve combine curve all

grafik