×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Accuracy in finding intersection of lines and surfaces.

Accuracy in finding intersection of lines and surfaces.

Accuracy in finding intersection of lines and surfaces.

(OP)
I run into this occasionally, and can't find a solution to it.
Please see the attached image.  Briefly, the problem is that I am placing datum points at the intersection of a line and a curved surface.  The result is clearly not the intersection...it is quite a ways off.  I have my display quality in ProE W4 set to 10 (maximum) and my accuracy should be plenty (relative or absolute).

Thanks for any replies!

RE: Accuracy in finding intersection of lines and surfaces.

(OP)
I was wrong about the problem showing up in exported Wavefront files.  They're OK.  It IS just a display issue in ProE.  Still...is there any way to get it to go away?

RE: Accuracy in finding intersection of lines and surfaces.

Don't zoom in. Kidding aside, I have noticed this before and in my experience it is always just a visual issue. Increasing the line quality as well as the shade quality helps but if you zoom in a lot the discontinuity will appear.

RE: Accuracy in finding intersection of lines and surfaces.

(OP)
I spoke too soon.  The parts really DO intersect when they should just touch.  It appears to be related to accuracy somehow.  If I bring a surface in via CopyGeom, to act as a trimming surface, if that surface was not created to the same absolute accuracy as the "host" file, weird problems like this happen.

This is a bummer, because any part file will only give you a certain range of accuracy to work with.  So if you need to copy something from that file into a "host" file, often times its accuracy cannot be made to land within the allowable range of the file it is being imported into.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources