Boundingbox Size of Point selection

Helper

On 21/12/2015 at 02:34, xxxxxxxx wrote:

Hi, I am trying to get the Size of a Pointselection...basically what obj.GetRad() is for Objectsize...but for selected Points.

Is there an easy way?

Helper

On 21/12/2015 at 03:28, xxxxxxxx wrote:

The easy way is to calculate it. It's simple for a given set of points. Just make sure you use a copy of
the starting point, otherwise you'll have two times the same vector and that will lead to wrong results.

minv = c4d.Vector(points[0])
maxv = c4d.Vector(points[0])

Helper

On 21/12/2015 at 03:35, xxxxxxxx wrote:

I tried this...whats not working here?

def GetSelectionSize(op) :
  
  
    sel = op.GetPointS()
    points = [(i, point)
          for i, point in enumerate(op.GetAllPoints())
          if sel.IsSelected(i)]
  
    if not points:
      return
  
    selsizemin = min(c4d.Vector(point[1]) for point in points)
    selsizemax = max(c4d.Vector(point[1]) for point in points)
    selsize= selsizemax-selsizemin
    return selsize

Helper

On 21/12/2015 at 04:10, xxxxxxxx wrote:

You have to find the min/max for each **component (x, y, z) **of all points, not the min/max of all points.

Helper

On 21/12/2015 at 04:11, xxxxxxxx wrote:

Also, why do you write point[1] ? That'll give you the Y component of the Vector.

Helper

On 21/12/2015 at 04:11, xxxxxxxx wrote:

I guess you are right

Helper

On 21/12/2015 at 04:56, xxxxxxxx wrote:

This Works now. I guess its more complicated than it could be

def GetSelectionSize(op) :
  
  
    sel = op.GetPointS()
    points = [(i, point)
          for i, point in enumerate(op.GetAllPoints())
          if sel.IsSelected(i)]
  
    if not points:
      return
  
    selsizeminX = min(point[1].x for point in points)
    selsizemaxX = max(point[1].x for point in points)
    selsizeminY = min(point[1].y for point in points)
    selsizemaxY = max(point[1].y for point in points)
    selsizeminZ = min(point[1].z for point in points)
    selsizemaxZ = max(point[1].z for point in points)
  
    boundbox= c4d.Vector(selsizemaxX,selsizemaxY,selsizemaxZ)-c4d.Vector(selsizeminX,selsizeminY,selsizeminZ)
    selsize=boundbox.GetLength()
    return selsize

Helper

On 21/12/2015 at 05:00, xxxxxxxx wrote:

Just a question, because Im instrested in: Wouldnt it be better to do all in one for-loop?

Helper

On 21/12/2015 at 06:05, xxxxxxxx wrote:

I tried it out. Im not sure if its the best practice, but the results.

import c4d  
from datetime import datetime  
#Welcome to the world of Python  
  
class stopwatch() :  
    
  def __init__(self) :  
      start = datetime.now()  
        
  def start(self) :  
      self.start = datetime.now()  
      return self.start  
        
  def stop(self) :  
      return datetime.now()-self.start  
    
def GetSelectionSize(op) :  
  
  sel = op.GetPointS()  
  points = [(i, point)for i, point in enumerate(op.GetAllPoints())if sel.IsSelected(i)]  
  
  if not points: return  
  
  selsizeminX = min(point[1].x for point in points)  
  selsizemaxX = max(point[1].x for point in points)  
  selsizeminY = min(point[1].y for point in points)  
  selsizemaxY = max(point[1].y for point in points)  
  selsizeminZ = min(point[1].z for point in points)  
  selsizemaxZ = max(point[1].z for point in points)  
  
  boundbox = c4d.Vector(selsizemaxX,selsizemaxY,selsizemaxZ)-c4d.Vector(selsizeminX,selsizeminY,selsizeminZ)  
  selsize = boundbox.GetLength()  
  return selsize  
  
def GetSelectionSize2(obj) :  
  v_min = None  
  v_max = None  
  for i, sel in enumerate(obj.GetPointS().GetAll(obj.GetPointCount())) :  
      if sel:  
          p = obj.GetPoint(i)  
          if v_min == None: v_min = c4d.Vector(p.x, p.y, p.z)  
          if v_max == None: v_max = c4d.Vector(p.x, p.y, p.z)  
            
          v_min.x = min(v_min.x, p.x)  
          v_min.y = min(v_min.y, p.y)  
          v_min.z = min(v_min.z, p.z)  
          v_max.x = max(v_max.x, p.x)  
          v_max.y = max(v_max.y, p.y)  
          v_max.z = max(v_max.z, p.z)  
            
  boundbox = v_max - v_min  
  selsize = boundbox.GetLength()  
  return selsize  
    
    
def main() :  
  obj = op.GetDown()  
    
  t1 = stopwatch()  
  t1.start()  
  size = GetSelectionSize(obj)  
  print t1.stop()  
  print size  
    
    
  t1 = stopwatch()  
  t1.start()  
  size = GetSelectionSize2(obj)  
    
  print t1.stop()  
  print size  
  
  return None

Pointcount 600.001 and 300.000 selected:
GetSelectionSize(obj) : 0.022sec.
GetSelectionSize2(obj) : 0.017sec.

Pointcount 1.500.001 and 750.000 selected:
GetSelectionSize(obj) : 0.469sec.
GetSelectionSize2(obj) : 0.137sec.