curve/brep problem

Replies to This Discussion

Permalink Reply by Yoann Mescam (Systemiq) on May 25, 2011 at 8:12am

The intersections between your brep and the curves are points only.

Intersection overlap curves are not the parts of the curves inside the brep, but the ones intersecting the brep boundaries. Well I think.

Permalink Reply by Danny Boyes on May 25, 2011 at 8:38am

Have you seen the Ray Occlusion and Exposure components in the Mesh Tab?

 

Permalink Reply by Michael Lawlor on May 25, 2011 at 8:43am

Thanks for the replies, but I'm just trying to dispatch the curves into two lists--intersecting and non-intersecting

Permalink Reply by Danny Boyes on May 25, 2011 at 9:22am

I think this achieves what you need.

Attachments:

• IntersectRays.ghx, 110 KB

Permalink Reply by Sameer Kumar on May 25, 2011 at 10:41am

Danny,

What does the mass multiplication component do? How does it generate a culling pattern?

Permalink Reply by Danny Boyes on May 25, 2011 at 11:54am

If the lines have no intersections then they cannot generate a new line and so produce a Null value for the length component. The next component produces a True result if Null therefore all curves that do not intersect have a corresponding value of 1, but because there are three objects to intersect with, they have to be handled separately, so whilst a curve might not intersect two of the objects producing a 1 value on corresponding branches of two different trees the same location holds a 0 for the intersection of the third object. Thus when the path mapper is used to combine all corresponding branches together you get three items 1,1 and 0. Mass multiply for that branch (1*1*0) will result in a 0 and therefore that curve intersected at least one of the objects.

 

Permalink Reply by Michael Lawlor on May 25, 2011 at 10:47am

That's exactly what I was looking for! Thank you so much!