GHPYTHON HATCHING

Replies to This Discussion

Permalink Reply by roy orengo on January 4, 2017 at 10:17am

hi tom,

thank you very much for your message.

your solution works perfectly.

anyway why I need to pass inside rhino baking the geometry to apply the hatch? the guide suggest to use the command directly in GH so I thought to see the hatch inside grasshopper before to bake it as others geometries. could you explain me why this is not (yet?) possible? 

thanks again,

roy

Permalink Reply by Giulio Piacentino on January 7, 2017 at 3:12am

Hi guys,

Grasshopper has no concept of Hatches, nor any other dimension/annotation for the time being. That is why you can only make them work if you use them directly in Rhino, which of course has support for them.

Giulio
--
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

Permalink Reply by Marios Tsiliakos on January 5, 2017 at 6:43am

Interesting,

How is syntax highlighting possible in Ning text boxes?

Permalink Reply by roy orengo on January 5, 2017 at 8:53am

I think elefront was did in c# as gh plugin, so you can do this easier in c# as in elefront and with more difficult in python? we need to translate others rhino common API to python or the problem is different?

Permalink Reply by Marios Tsiliakos on January 5, 2017 at 11:44am

Hmmm,

Interesting. Thanks

Permalink Reply by roy orengo on January 6, 2017 at 6:35am

tom, you're a genius.

to return an hatch instead of lines what do you think would we need? it's a problem of the limitation of rhino common API, grasshopper or what other limits ?

and why in the rhinoscriptsyntax there is this example as could be easy also to use hatches in GH?:

import rhinoscriptsyntax as rs
circle = rs.AddCircle(rs.WorldXYPlane(), 10.0)
if rs.IsHatchPattern("Grid"):
    rs.AddHatch( circle, "Grid" )
else:
    rs.AddHatch( circle, rs.CurrentHatchPattern() )

Permalink Reply by roy orengo on January 6, 2017 at 1:26pm

I did it, tom,  mixing your two solutions.

a output show the preview as lines, b output bake the hatch as hatch.

anyway what do you think about my last points?

Attachments:

• hatches_tom_roy.gh, 8 KB

Permalink Reply by Marios Tsiliakos on January 5, 2017 at 3:45am

You can add the following for picking through the available hatches.

active_doc = Rhino.RhinoDoc.ActiveDoc
h_patterns = active_doc.HatchPatterns
h_active = active_doc.HatchPatterns.CurrentHatchPatternIndex
h_cnt = h_patterns.Count

if style>cnt:
print("Not enough hatch patterns")
print("your current hatch pattern is " + h_active.ToString())
print("You can choose one from the hatches below:")
for j in range(h_cnt):
print(str(j)+ " = " + active_doc.HatchPatterns[j].Name.ToString())
active_doc.HatchPatterns.CurrentHatchPatternIndex = style

You need to register an int input named style

Ta,

M

Permalink Reply by roy orengo on January 5, 2017 at 5:48am

hi Marios,

thank you very much for your message.

so now I can see the list of the hatches that are inside the rhino active documents.

how can I use them in grasshopper? it's possible to apply them to a closed curve and see the current hatch's preview inside grasshopper?

and what about the fact that inside the rhinoscriptsyntax commands there is this example:

import rhinoscriptsyntax as rs
circle = rs.AddCircle(rs.WorldXYPlane(), 10.0)
if rs.IsHatchPattern("Grid"):
rs.AddHatch( circle, "Grid" )
else:
rs.AddHatch( circle, rs.CurrentHatchPattern() )

as it could be very simple to use this command?

Permalink Reply by Marios Tsiliakos on January 5, 2017 at 6:43am

Previewing is not possible. As Tom mentioned you might be able to hack your way around it. I haven't tried it.

if you merge Tom's snippet and mine you will something working.

Best,

M

import Rhino
from Rhino.Geometry import Hatch

active_doc = Rhino.RhinoDoc.ActiveDoc
h_patterns = active_doc.HatchPatterns
h_active = active_doc.HatchPatterns.CurrentHatchPatternIndex
h_cnt = h_patterns.Count

if style>h_cnt:
print("Not enough hatch patterns")
print("your current hatch pattern is " + h_active.ToString())
print("You can choose one from the hatches below:")
for j in range(h_patterns.Count):
print(str(j)+ " = " + active_doc.HatchPatterns[j].Name.ToString())
active_doc.HatchPatterns.CurrentHatchPatternIndex = style

if bake:
hatches = Hatch.Create(curves,style,0.0,1.0)
for i in range(len(hatches)):
Rhino.RhinoDoc.ActiveDoc.Objects.AddHatch(hatches[i])