Clipping Planes with Hatches in Grasshopper

[chanley (Chris Hanley)]

Below is a WIP of a way to use/manipulate a clipping plane, and apply a hatch fill . Most of the code is from things I have posted before, (I will provide links below). It also uses the Human Plugin, (which I use all the freaking time!), for some line weight display . Also, maybe the make2d components can already do this?

It uses 4 custom components:
1 - Retrieve hatch patterns from active Rhino Doc (Human has this)
2 - Apply those hatch patterns to some boundary curves
3 - Apply a material from the active Rhino Doc to preview
4 - Create 1 clipping plane

Reference:
Material with GHPython - Code Example

GHPython, Rhino Materials and Custom Preview-supports texture/bump?!

First off, I can’t believe I missed this. I don’t use textures/materials in GH very often, (beyond basic coloring/shading so it wasn’t on my radar.). TLDR; spent afternoon writing up something for functionality that already exists…at least in the current Rhino 6 version) https://discourse.mcneel.com/t/grasshopper-custom-render-objects/44567 Someone asked me if we could use materials from their Rhino Document as preview materials. They were using an older material table plugin from Human an…

Hatch with GHPython - Code Example

Creating Hatches/Previewing Hatches From GH Python

Earlier this week I learned that I wasn’t understanding some fundamental programming concepts regarding GHpython/GH/Rhino, (thank you @piac for setting me straight!) As a result, I wanted to better understand what the GHPython component would need to display something like hatches. NOTE: Before going any further, if you want to do anything with hatches/layers/attributes…you should use Human or Elefront. Those plugins are much more robust/flexible/just plain better. But… for the sake of taki…

Clipping Planes in GH - Discussion

Creating clipping plane from Grasshopper?

after I restarted Rhino, it messed up my script I have to create it from scratch following the same step-by-step scenario. creating the clipping plane with ghpython OK add sticky with value clipping plane guid a = sticky (to create the clipping plane from the sticky) add in front of all a line to delete the clipping plane with guid that is equal to the sticky.

Make2D SDK

New approach with setting up projections is slowly (very slowly) getting there. There’s now 2 ways to set up a projection, either a Parallel one using a rectangle as frame (with proper preview, as shown above) or by referencing a Rhino named view or viewport.

Here is the current example code for the clipping plane from GHPython. (Type hint for Plane input set to Plane, Type hint for F, set to Boolean)
NOTE: this is off the cuff/bespoke code, and is just a working test. mileage may vary.

import Rhino
import scriptcontext as sc
import Grasshopper

if F and Plane:
    Plane.Flip()
try:
    # Check if exists in sticky, if not, Add the cutting plane, add GUID to the sticky dict, delete object
    if "cplaneID" not in sc.sticky: 
        AVGuid = Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.ActiveViewportID
        NewClipPlane = Rhino.RhinoDoc.ActiveDoc.Objects.AddClippingPlane(Plane, 25, 25, AVGuid)
        sc.sticky["cplaneID"] = NewClipPlane
        Rhino.RhinoDoc.ActiveDoc.Objects.Delete(Rhino.RhinoDoc.ActiveDoc.Objects.FindId(sc.sticky["cplaneID"]))
    # If it does exsist, delete it and create a new one each time this component updates
    else:
        Rhino.RhinoDoc.ActiveDoc.Objects.Delete(Rhino.RhinoDoc.ActiveDoc.Objects.FindId(sc.sticky["cplaneID"]))
        AVGuid = Rhino.RhinoDoc.ActiveDoc.Views.ActiveView.ActiveViewportID
        NewClipPlane = Rhino.RhinoDoc.ActiveDoc.Objects.AddClippingPlane(Plane, 1, 1, AVGuid)
        sc.sticky["cplaneID"] = NewClipPlane
        print sc.sticky["cplaneID"]
except Exception, ex:
    ghRunTimeMsgLevel = Grasshopper.Kernel.GH_RuntimeMessageLevel
    ghenv.Component.AddRuntimeMessage(ghRunTimeMsgLevel.Warning,str(ex))

a = Plane

[anon39580149]

Thank you , very useful
Is there a better way to create one clipping plane with specific id or store the first id and use it again?
Sometimes when i lock objects in Rhino or hide them the script create duplicate clipping plane.

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I use GetFillSurfaces to create hatch boundary

[MishaBro]

Hi Chris,

Thank you for your code.
I am trying to implement it with multiple hatches.
I tried different approaches for over three days, and still cannot figure out how to do it properly.
This is the closest I could get to my goal. (The circle isnt working yet).
multiCycleHatches.gh (14.5 KB)
.

I don’t really need hatches to be “Baked” onto the canvas, I just only need preview with the ability to change properties, without creating(overlapping) new hatches.