[Bf-python] Incorrect checking for zero length vector

[Gilbert, Joseph]

Sorry cam about the headaches here with this method. Hope it's fixed
now. I was testing with this script:

import Blender
from Blender.Mathutils import *

v1 = Vector(10.0,0,0)
v2 = Vector(0,0,0)

try:
	angle = AngleBetweenVecs(v1,v2)
	print angle
except AttributeError, err:
	if v1.length == 0:
		print v1, ' has a 0 length'
	elif v2.length == 0:
		print v2, ' has a 0 length'
	else:
		print err
		print v1.length, v2.length

-----Original Message-----
From: bf-python-bounces at projects.blender.org
[mailto:bf-python-bounces at projects.blender.org] On Behalf Of Gilbert,
Joseph
Sent: Friday, October 07, 2005 10:37 AM
To: Blender Foundation Python list
Subject: RE: [Bf-python] Incorrect checking for zero length vector

I tried the following script:
import Blender
from Blender.Mathutils import *

v1 = Vector(10.0,0,0)
v2 = Vector(0,1,0)

try:
	angle = AngleBetweenVecs(v1,v2)
	print angle
except AttributeError, err:
	if v1.length is 0:
		print v1, ' has a 0 length'
	elif v2.length is 0:
		print v2, ' has a 0 length'
	else:
		print err
		print v1.length, v2.length

and got back that this is an error so I'll see if I can track this down.

-----Original Message-----
From: bf-python-bounces at projects.blender.org
[mailto:bf-python-bounces at projects.blender.org] On Behalf Of Gilbert,
Joseph
Sent: Friday, October 07, 2005 10:28 AM
To: cbarton at metavr.com; Blender Foundation Python list
Subject: RE: [Bf-python] Incorrect checking for zero length vector

This is the expected behavior that we talked about earlier. A
zero-length vector is not really a vector at all :) (well sort of) and
it is not possible to calculate the angle between a real vector and what
is essentially nothing - thus raising an error.

Maybe a test could be: (?)
If v1.length is not 0 and v2.length is not 0:
...angle = AngleBetweenVecs(v1,v2)
Else:
...raise AttributeError, 'Something went wrong'
Print angle


-----Original Message-----
From: bf-python-bounces at projects.blender.org
[mailto:bf-python-bounces at projects.blender.org] On Behalf Of Campbell
Barton
Sent: Thursday, October 06, 2005 7:57 PM
To: bf-python at blender.org
Subject: [Bf-python] Incorrect checking for zero length vector

Found that AngleBetweenVecs raises an error when checking for a zero 
length Vector

# Heres my test from the interactive console.
print Mathutils.AngleBetweenVecs(Mathutils.Vector(10.0, 0 , 0), 
Mathutils.Vector(0,1,0))
exceptions.AttributeError:  Mathutils.AngleBetweenVecs(): zero-length 
vectors not acceptable

- Cam

-- 
Campbell J Barton

133 Hope Street
Geelong West, Victoria 3218 Australia

URL:    http://www.metavr.com
e-mail: cbarton at metavr.com
phone: AU (03) 5229 0241
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