Sewing with higher tolerance values - Forum Open Cascade Technology

Lahiru Dilshan
Thu, 07/27/2023 - 09:58

Forums:

Hi All,
I have a question regarding the sewing operation.
I have a shape size of 10m in length, 20m in height and 30m in width. I'm supposed to use "sewing" operation with a 10mm tolerance value.
What I want to know is does Open CASCADE can handle that kind of big tolerance value. Is that going to deform the shape?

For sewing do we need to use tolerance values like 1e-3mm always? Is that the best way?

It would be very helpful if anyone can give me an explanation about how to use sewing algorithm.

Thank you.
Lahiru.

Dmitrii Pasukhin
Mon, 07/31/2023 - 17:31

Hello,

The tolerance value is adaptive for your purposes. You are free to choose the own tolerance. If you face up with some problem, you are welcome to bugtracker.

To check by DRAW command you can try the next command:

sewing result shape1
---help---
Use: sewing result [tolerance] shape1 shape2 ... [min tolerance] [max tolerance] [switches]
To set user's value of min/max tolerances the following syntax is used: +<parameter> <value>
- parameters are identified by letters:
  mint - min tolerance
  maxt - max tolerance
Switches allow to tune other parameters of Sewing
The following syntax is used: <symbol><parameter>
- symbol may be - to set parameter off, + to set on
- parameters are identified by letters:
  s - mode for creating sewed shape
  a - mode for analysis of input shapes
  c - mode for cutting of free edges
  n - mode for non manifold processing
  p - mode for same parameter processing for edges
  e - mode for sewing floating edges
  f - mode for sewing faces

Best regards, Dmitrii.