Clipping Planes within Grasshopper

Replies to This Discussion

Permalink Reply by peter fotiadis on May 22, 2017 at 12:38am

http://www.grasshopper3d.com/forum/topics/object-as-clipping-elemen...

Permalink Reply by CC Chiang on May 22, 2017 at 3:37pm

Thanks! But I'm not sure if this is applicable. Is there no way of

Permalink Reply by peter fotiadis on May 22, 2017 at 11:55pm

You haven't finished your sentence: is there no way of ... what?

BTW: You can use any Plane(s) you want

Permalink Reply by CC Chiang on May 23, 2017 at 2:10am

Sorry! I meant to ask if there's any way to reference a clipping plane within Gh but you've answered that by noting that any plane will do.

Permalink Reply by peter fotiadis on May 23, 2017 at 5:20am

This build uses either an internal demo plane or as many planes you want (defined for the occasion via a facet dome).

Pay attention to the flip boolean option:

Why? because the "visible" slice per plane orients // to plane's Z: meaning that you may have defined a zillion of planes but if they point to the wrong direction (in relation to the visible objects)  ... blah, blah.

Here's no clipping planes + a Rhino object (white) + a GH object (blue box: not visible since is "inside" the white one:

And here's what happened if you activate 16 planes simultaneously:

Rhino file contains some instance definitions: place a zillion around and have fun .

Bad news: In real-life ... well .. effectively managing the planes requires code that deals with items in collections (volatile data management).

This is far and beyond of what someone not familiar with coding could master

Note: GH objects behave differently in comparison to Rhino objects (no "heal", that is: switch off the white and observe the blue)

Attachments:

• Clip_planes_V1B.gh, 125 KB
• Clip_planes_V1.3dm, 1.6 MB

Permalink Reply by peter fotiadis on May 23, 2017 at 6:11am

BTW: This "global" delete policy maybe makes some sense more (replace the Purgexxx Method):

private void ClearClipPlanes(ref int removed){
    RhinoObject[] objsPrev = RhinoDoc.ActiveDoc.Objects.FindByObjectType(ObjectType.ClipPlane);
    if (objsPrev != null){
      removed = objsPrev.Length;
      foreach (RhinoObject obj in objsPrev)RhinoDocument.Objects.Delete(obj, true);
    }
  }