Pipeline Breaks When Hidden Objects Included

Replies to This Discussion

Permalink Reply by Nik Willmore on May 12, 2015 at 5:22am

Indeed, Python to the rescue:

import rhinoscriptsyntax
import scriptcontext
import Rhino

OBJECTS_CONTAINER = []

scriptcontext.doc = Rhino.RhinoDoc.ActiveDoc # Speak directly to Rhino

ALL_OBJECTS = rhinoscriptsyntax.ObjectsByLayer("Nik_Mesh_Cocoon_NURBS_Solids_Input") # Get GUIDs of each object.

for q in ALL_OBJECTS:
  EACH_OBJECT = rhinoscriptsyntax.coercebrep(q) # Grab actual objects from GUIDs "coerced" as breps.
  OBJECTS_CONTAINER.append(EACH_OBJECT)

ObjectsFromInputLayer = OBJECTS_CONTAINER

scriptcontext.doc = ghdoc # Return Python state of speaking to Grasshopper

Based on: http://www.grasshopper3d.com/forum/topics/use-objectsbylayer-in-pyt...

Now how do I leave out Hidden Objects at will? Delving into rhinocommon.chm....

Permalink Reply by djordje on May 12, 2015 at 5:35am

Hi Nik,
rhinoscriptsyntax module itself has a IsObjectHidden function. You check if an object is hidden before adding it to your OBJECTS_CONTAINER list:

import rhinoscriptsyntax
import scriptcontext
import Rhino

OBJECTS_CONTAINER = []

scriptcontext.doc = Rhino.RhinoDoc.ActiveDoc # Speak directly to Rhino

ALL_OBJECTS = rhinoscriptsyntax.ObjectsByLayer("Nik_Mesh_Cocoon_NURBS_Solids_Input") # Get GUIDs of each object.

for q in ALL_OBJECTS:
    if rs.IsObjectHidden(q) == False:
        EACH_OBJECT = rhinoscriptsyntax.coercebrep(q) # Grab actual objects from GUIDs "coerced" as breps.
        OBJECTS_CONTAINER.append(EACH_OBJECT)

ObjectsFromInputLayer = OBJECTS_CONTAINER

scriptcontext.doc = ghdoc # Return Python state of speaking to Grasshopper

Permalink Reply by Nik Willmore on May 12, 2015 at 5:40am

Ah, thanks, I only looked in rhinocommon.chm not also RhinoScript.chm!

Permalink Reply by Nik Willmore on May 12, 2015 at 5:53am

It's also in RhinoIronPython.chm.

Permalink Reply by Anders Holden Deleuran on May 12, 2015 at 5:58am

Just to round this one off. I'm fairly certain that rs.IsObjectHidden() is simple a wrapper around the RhinoObject property IsHidden. You can always check the RhinoScriptSyntax source directly, on my system it is located here:

C:\Users\adel\AppData\Roaming\McNeel\Rhinoceros\5.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript

Permalink Reply by Nik Willmore on May 12, 2015 at 6:05am

Indeed, in object.py is this:

def IsObjectHidden(object_id):
    """Verifies that an object is hidden. Hidden objects are not visible, cannot
    be snapped to, and cannot be selected
    Parameters:
      object_id: String or Guid. The identifier of an object
    Returns:
      True if the object is hidden
      False if the object is not hidden
    """
    rhobj = rhutil.coercerhinoobject(object_id, True, True)
    return rhobj.IsHidden

Permalink Reply by Anders Holden Deleuran on May 12, 2015 at 5:46am

I've noticed this bug before as well. As far as I can recall, checking both "Include Locked Objects" and "Include Hidden Objects" will get the Rhino doc objects though. The good thing about the Pipeline is that you do not have to monitor events yourself (which can be rather complex)..

Permalink Reply by Nik Willmore on May 12, 2015 at 5:50am

I'm already leaving the solver disabled to allow a Rhino user to work unencumbered by "creepy" Grasshopper until he manually issues a Recompute menu command to invoke a single cycle of Grasshopper. For any Grasshopper script that is rather slow it's the only way to go. It's not in the manual that Recompute still works with the solver disabled, but then there is no manual in the first place.

Permalink Reply by Anders Holden Deleuran on May 12, 2015 at 6:05am

Ah see. In that case it properly actually does make a lot of sense to explicitly manage when objects are loaded into Grasshopper from the the Rhino doc (using Python or one of the other scripting components). I've previously used this approach quite extensively using formalized Rhino layering conventions (naming, color, parent/child relationships) and a simple button to reload the Rhino objects at will.