Sorting Curves/ Find Base Curve

Hello.

Does anybody have any idea, how it would be possible to find a base curve for a bunch of surfaces which together makes a pyramid?

This far I have tried to describe/ find a base curve by searching for similar curves to each surface's bounding box's base curve (closest to the ground) by angles close to 0 and 180 degree between BBox's base curve and surface curves. But unfortunately it doesn't work out.

As you can see in the image bellow, there are 4 surfaces which has been split into smaller pieces - to make more regular forms.

For each of these split surfaces I have to find a base curve which isn't possible by angles method described before nor closest to the ground method, because, as you can see in the image, needed base curves (with arrow) are positioned both in highest and lowest points.

Do you have any idea?

Replies to This Discussion

Permalink Reply by djordje on October 25, 2012 at 11:38am

What are the base curves? An outline of the lowest edges of the roof?

Permalink Reply by Otto Pile on October 25, 2012 at 11:46am

Yes, by curves I mean outline of the roof's surfaces.

No, not the lowest edges in all cases. Like you can see in the image - the surfaces in Purple color - one of them has a "base curve" as highest edge of the surface.

Permalink Reply by djordje on October 25, 2012 at 11:59am

Sorry I still do not understand what a base curve/outline is.

Permalink Reply by Otto Pile on October 25, 2012 at 12:11pm

Imagine, "roof" consists of 4 surfaces (4 colors in image), which are being split into smaller surfaces (triangles and rectangles). Each of these new made surfaces has 3 or 4 edge curves (depends on which figure is it) - these are the curves/outlines.

In each of these new surfaces I need to find which curves are the most parallel to ground. In triangles it is one curve, in rectangles - 2 curves.

After that, in rectangle surface's I pick lowest one as "base curve", but in triangle the only one "parallel" curve stays as "base curve"

Permalink Reply by Otto Pile on October 25, 2012 at 12:14pm

As you can see in the image, one of Purple color's triangles is upside - down. So the base curve for that triangle is highest curve - for others lowest.

Permalink Reply by Yoann Mescam (Systemiq) on October 25, 2012 at 12:01pm

Join Brep, Merge faces, Explode, Edges, Join

Permalink Reply by Otto Pile on October 25, 2012 at 12:17pm

Unfortunately, this is not what I am looking for. Please check the latest comments, where I describe more what I mean by base curves etc.

Permalink Reply by Yoann Mescam (Systemiq) on October 25, 2012 at 1:14pm

If what you need to find is the edges the more parallel to the ground, just sort them considering their angle between their projection to XY and themselves.

Unless I misunderstood you again hehe.