Accuracy in finding intersection of lines and surfaces.

[treddie]

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!

 

[treddie]

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?

 

[aafuni]

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.

 

[treddie]

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.