Pick item from block instance

Rhino Developer
1

Hi there,

is there a way to extract an item from a block instance (blockreference) without exploding it?
I did not find any possiblity in Rhino.Input so far.
Maybe I simply did nto see it.
Otherwise I would have to explode a copy of the instance and then pick it, right?
Or is there an easier way?

Thanks,
T.

2

Hi @tobias.stoltmann,

Just hold the Shift key down when selecting:

import Rhino
import scriptcontext as sc

filter = Rhino.DocObjects.ObjectType.Surface | \
         Rhino.DocObjects.ObjectType.PolysrfFilter
         
go = Rhino.Input.Custom.GetObject()
go.SetCommandPrompt("Select surfaces and polysurfaces")
go.GeometryFilter = filter
go.GetMultiple(1, 0)
if go.CommandResult() == Rhino.Commands.Result.Success:
    print('{0} object(s) selected'.format(go.ObjectCount))

– Dale

1 Like
3

As always: works like a charm,@dale.
Is there any chance to get the instance reference the surface belongs to by any chance?

4

@dale, I do not even have to hold the Shift key to do so.

5

Hi @tobias.stoltmann,

Try this:

import Rhino
import scriptcontext as sc

go = Rhino.Input.Custom.GetObject()
go.SetCommandPrompt("Select surfaces and polysurfaces")
go.GeometryFilter = Rhino.DocObjects.ObjectType.Surface     
go.GetMultiple(1, 0)
if go.CommandResult() == Rhino.Commands.Result.Success:
    for objref in go.Objects():
        obj = objref.Object()
        if obj:
            print('Id = {0}, Type = {1}'.format(obj.Id, obj.ObjectType))
        srf = objref.Surface()
        if srf:
            print(' Degree "U" = {0}, "V" = {1}'.format(srf.Degree(0), srf.Degree(1)))

– Dale

6

@dale , thanks. Without testing (I will be able later), I guess I was a bit to inprecise. What I would need is the block definition or block instance this item is contained in to be able to replace it to it after modifying it.

7

Hi @tobias.stoltmann,

This is the instance object:

obj = objref.Object()

And this will get you the instance definition:

if isinstance(obj, Rhino.DocObjects.InstanceObject):
    idef = obj.InstanceDefinition
    if idef:
        print('Block name = {0}'.format(idef.Name))

– Dale

8

I have to admit I was always stuggling with the ObjRefs so far, but now I got the idea. :slight_smile:
THANKS!

9

@dale , I do not intend to carry this too far, but there is one last question.
This only works for “simple” block references, right?

If I am dealing with nested blocks, this will not work. As far as I tested it now, it always refers to the “superior” block.