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#!/usr/bin/env python
# -*- coding: utf-8 -*-
from vtkmodules.vtkCommonCore import (
vtkMath,
vtkPoints,
)
from vtkmodules.vtkCommonDataModel import vtkBoundingBox
from vtkmodules.vtkCommonSystem import vtkTimerLog
import sys
# Test speed, serial versus threaded, of compute bounds in
# vtkBoundingBox.
# Control model size
baseSize = 1000
threadingCrossover = 750000
timer = vtkTimerLog()
math = vtkMath()
# Uncomment if you want to use as a little interactive program
#if len(sys.argv) >= 2 :
# res = int(sys.argv[1])
#else:
# res = baseSize
# Compares serial to threaded computation of the bounding box. The current
# crossover point is hardcoded in the code (vtkBoundingBox.cxx) so this test
# may need to be updated in the future. (The crossover point, expressed in
# terms of number of points, is used to switch between a serial computation
# for smaller data, versus a threaded computation for larger data, due to the
# cost of spinning up threads.)
serialPoints = vtkPoints()
serialPoints.SetDataTypeToDouble()
serialPoints.SetNumberOfPoints(threadingCrossover - baseSize)
numSerialPts = threadingCrossover - baseSize;
for i in range(0,numSerialPts):
serialPoints.SetPoint(i, math.Random(-1.0,1.0),
math.Random(-1.0,1.0),
math.Random(-1.0,1.0))
threadedPoints = vtkPoints()
threadedPoints.SetDataTypeToDouble()
threadedPoints.SetNumberOfPoints(threadingCrossover + baseSize)
numThreadedPts = threadingCrossover - baseSize;
for i in range(0,numThreadedPts):
threadedPoints.SetPoint(i, math.Random(-1.0,1.0),
math.Random(-1.0,1.0),
math.Random(-1.0,1.0))
serialBox = [0.0,0.0,0.0,0.0,0.0,0.0]
threadedBox = [0.0,0.0,0.0,0.0,0.0,0.0]
bbox = vtkBoundingBox()
timer.StartTimer()
bbox.ComputeBounds(serialPoints,serialBox)
timer.StopTimer()
serialTime = timer.GetElapsedTime()
timer.StartTimer()
bbox.ComputeBounds(threadedPoints,threadedBox)
timer.StopTimer()
threadedTime = timer.GetElapsedTime()
print("vtkBoundingBox::ComputeBounds():")
print("\tSerial Time: {0}".format(serialTime))
print("\tBounds: {0}".format(serialBox))
print("\tThreaded Time: {0}".format(threadedTime))
print("\tBounds: {0}".format(threadedBox))
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