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Blender 2.6 Bug Tracker: Browse
[#24660] (vector * matrix) fails, (matrix * vector) succeeds
Date:
2010-11-11 12:34
Priority:
3
State:
Closed
Submitted by:
Tom Edwards (
artfunkel
)
Assigned to:
Campbell Barton (campbellbarton)
Category:
Python
Status:
Fixed / Closed
Relates to:
Duplicates:
Patches:
Summary:
(vector * matrix) fails, (matrix * vector) succeeds
Detailed description
See the attached blend for a demonstration. Here is the code:
import bpy
loc = bpy.data.objects['Plane'].data.vertices[0].co
mat = bpy.data.objects['Plane'].matrix_world
print(loc) # [0,-2,0], local position
print(loc*mat) # [0,-2,0], no change
print(mat*loc) # [0,-2,2], correct worldspace position
Followup
Message
Date
: 2010-11-11 12:57
Sender
:
Ton Roosendaal
For campbell to check on. Note that matrix multiplication is not commutative. AB is not equal to BA.
Date
: 2010-11-12 02:49
Sender
:
Campbell Barton
your correct, really good you noticed this now.
from looking into numpy and scientific python libs this is standard.
changed r33029.
Attached Files:
Name
Date
Download
vm-mv.blend
2010-11-11 12:34
Download
Changes:
Field
Old Value
Date
By
Resolution
Investigate
2010-11-12 02:49
campbellbarton
close_date
2010-11-12 02:49
2010-11-12 02:49
campbellbarton
status_id
Open
2010-11-12 02:49
campbellbarton
Resolution
None
2010-11-11 12:57
ton
assigned_to
none
2010-11-11 12:57
ton
File Added
13518: vm-mv.blend
2010-11-11 12:34
artfunkel
