Re: [script] Comparing two transforms

["Bernard Lebel" <3dbernard(at)gmail.com>]

Hi everyone,

Thanks a lot for the advice. I've done some timing comparisons between
the 3 techniques (mine, Guillaume's and Joe's).

Basically I'm calling each comparing functions 1000 times.
For function "compare4", I've made integrated Joe's approach into
Guillaume's one, and it made a significant difference.
Here is the code:



import time
import win32com

xsi = Application
xsimath = win32com.client.Dispatch( 'XSI.Math' )




def timer( oT1, oT2, functionName ):
	time1 = time.clock()

	for i in range(1000):
		functionName( oT1, oT2 )

	time2 = time.clock()
	xsi.logmessage( '%s : %s' % ( functionName.__name__, round(time2 -
time1, 3) ) )



def compare1( oT1, oT2 ):
	
	if round( oT1.PosX, 4 ) != round( oT2.PosX, 4 ):
		return False
	elif round( oT1.PosY, 4 ) != round( oT2.PosY, 4 ):
		return False
	elif round( oT1.PosZ, 4 ) != round( oT2.PosZ, 4 ):
		return False
	elif round( oT1.RotX, 4 ) != round( oT2.RotX, 4 ):
		return False
	elif round( oT1.RotY, 4 ) != round( oT2.RotY, 4 ):
		return False
	elif round( oT1.RotZ, 4 ) != round( oT2.RotZ, 4 ):
		return False
	elif round( oT1.SclX, 4 ) != round( oT2.SclX, 4 ):
		return False
	elif round( oT1.SclY, 4 ) != round( oT2.SclY, 4 ):
		return False
	elif round( oT1.SclZ, 4 ) != round( oT2.SclZ, 4 ):
		return False
	else:
		return True



def compare2( oT1, oT2 ):
	
	oMatrixA = xsimath.CreateMatrix4()
	oT1.GetMatrix4( oMatrixA )
	
	oMatrixB = xsimath.CreateMatrix4()
	oT2.GetMatrix4( oMatrixB )
	
	for i in range(0, 4):
		for j in range(0, 4):
			
			if round( oMatrixA.Value(i, j) ) != round( oMatrixB.Value(i,j) ):
				return False
	
	return True





def compare3( oT1, oT2 ):
	
	if abs( oT1.PosX - oT2.PosX ) > 0.0001:
		return False
	elif abs( oT1.PosY - oT2.PosY ) > 0.0001:
		return False
	elif abs( oT1.PosZ - oT2.PosZ ) > 0.0001:
		return False
	elif abs( oT1.RotX - oT2.RotX ) > 0.0001:
		return False
	elif abs( oT1.RotY - oT2.RotY ) > 0.0001:
		return False
	elif abs( oT1.RotZ - oT2.RotZ ) > 0.0001:
		return False
	elif abs( oT1.SclX - oT2.SclX ) > 0.0001:
		return False
	elif abs( oT1.SclY - oT2.SclY ) > 0.0001:
		return False
	elif abs( oT1.SclZ - oT2.SclZ ) > 0.0001:
		return False
	else:
		return True





def compare4( oT1, oT2 ):
	
	oMatrixA = xsimath.CreateMatrix4()
	oT1.GetMatrix4( oMatrixA )
	
	oMatrixB = xsimath.CreateMatrix4()
	oT2.GetMatrix4( oMatrixB )
	
	for i in range(0, 4):
		for j in range(0, 4):
			
			if abs( oMatrixA.Value(i, j) - oMatrixB.Value(i,j) ) > 0.0001:
				return False
	
	return True









oSel1 = xsi.selection(0)
oT1 = oSel1.Kinematics.Global.Transform

oSel2 = xsi.selection(1)
oT2 = oSel2.Kinematics.Global.Transform


aFunctionNames = [ compare1, compare2, compare3, compare4 ]

for oFunctionName in aFunctionNames:
	timer( oT1, oT2, oFunctionName )




Now here are the results:

#INFO : compare1 : 0.088 -> My function
#INFO : compare2 : 1.897 -> Guillaume
#INFO : compare3 : 0.085 -> Joe
#INFO : compare4 : 1.551 -> Joe's suggestion integrated into Guillaume's


Joe's the big winner by a few milliseconds  :-D




Cheers
Bernard
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