Contents

1. GHPython – Intro
   1. Download and install
   2. UI
2. GHPython – Input Parameter
   1. Input variable declaration
   2. Access
   3. Type hint
3. GHPython – Output Parameter
   1. Output variable declaration
   2. “Out” value – Console
4. Rhinoscriptsyntax in GH
5. Practice
   1. Parametric spark model
   2. The Golden Spiral – convert Python code to Ghpython code

1. GHPython – Intro

1.1. Download and install

1. Download Ghpython from this site — http://www.food4rhino.com/project/ghpython?ufh(required Registration and Sigh up)
2. Drag and drop downloaded file to GH’s UI (= install)

1.2. UI

1. Set GHPython Component
   
2. GHPython Editer
   • Start-up　Ghpython Editer
     — Double Click Ghpython Component
   • Compare Python Editer and GHPython Editer

2. GHPython – Input Parameter

• Increase variable
  
• Name(Rename) variable
  
  
• Check input
  

Input value requires specifying “data Access type”

• Item Access — Python or GH’s single value
• List Access — Python’s List
• Tree Access — GH’s DataTree

Input value requires specifying “Type hint”

3. GHPython – Output Parameter

3.1. Output variable declaration

Increase variable

Name(Rename) variable

Check output

Notice: Type hint of value “a” = int

3.2. “Out” value – Console

“Out” value is preset output value. Connecting to Pannel Component, It show cosole data.

4. Rhinoscriptsyntax in GH

5. Practice

Please send your program data to Shuta by the end of the day
→ Submission is closed.

5.1 Parametric spark model

Please draw Parametric spark model as folowing figure by GHpython scripting

• Random value
  • Lengths of spark’s lines
  • Angles of spark’s lines

• Input value
  • input value1 “n”:Number of spark’s lines
  • input value2 “l”:Max length of spark’s lines

import rhinoscriptsyntax as rs
import random as rnd
import math as m

obj = []
 
for i in range(0, n):
    r = l * rnd.uniform(0.5, 1.0)
    angle1 = rnd.uniform(-1.0, 1.0)*2*m.pi
    angle2 = rnd.uniform(-1.0, 1.0)*2*m.pi
    
    x = r*m.sin(angle2)*m.cos(angle1)
    y = r*m.sin(angle2)*m.sin(angle1)
    z = r*m.cos(angle2)
    
    pt = rs.AddPoint([x,y,z])
    
    obj.append(pt)

5.2 The Golden Spiral

Please convert Python code to Ghpython code.

• Input value
  • input value “n”:Number of Fibonacci terms
  • input value “x”:X value of start point
  • input value “y”:Y value of start point
  • input value “z”:Z value of start point
• Algorithm of drawing The Golden Spiral

  import rhinoscriptsyntax as rs
  
  roopNum = 10
  originPt = [0.0, 0.0, 0.0]
  
  for i in range(roopNum): 
      
      if i == 0 :
          fn1 = 0  #the initial term of Fibonacci number
          fn  = 1  #the first term of Fibonacci number
      else:
          fn = fn1 + fn0 #Fibonacci progression
      
      #Print Fibonacci Num
      print  fn
      
      #Replacement of data for originPt
      if not i == 0:
          if i%4 == 0:
              originPt[0] -= fn0
          elif i%4 == 1:
              originPt[1] -= fn0
          elif i%4 == 2:
              originPt[0] += fn0
          elif i%4 == 3:
              originPt[1] += fn0
      
      #Drawing Recrangle
      rec = rs.AddRectangle(originPt, fn, fn)
      rec = rs.RotateObject(rec, originPt, 90.0*i)
      
      #Drawing Arc
      arc = rs.AddArc(originPt, fn, 90.0)
      arc = rs.RotateObject(arc, originPt, 90.0*i)
      
      fn0 = fn1 #Replacement of data for next step (f0)
      fn1 = fn #Replacement of data for next step (f1)