On Aug 4, 2009, at 7:55 AM, Luigi Calori wrote:
I'm unwilling to update as each time I update osg... there are some
problems with swig wrapping.
One of the worst issues has been the MixinVector that has broken
all the vecArrays wrapping thus preventing python construction of
geometry.
I do not know weather Robert is aware of the hassle this mod has
caused to osgswig users.
I'm still running against OSG 2.6 but was finally able to construct
custom geometry via Python with code similar to the following:
def vectorArrayFromList(vectorList):
from ctypes import *
vectorArray = osg.Vec3Array(len(vectorList))
arrayPointer =
pointer(c_float.from_address(int(vectorArray.getDataPointer())))
vectorSize = vectorArray.getDataSize()
offset = 0
for vector in vectorList:
for dim in range(3):
arrayPointer[offset + dim] = vector[dim]
offset += vectorSize
return vectorArray
The vectorList argument should be a list of tuples to stick into the
array, e.g. [(1.0, 2.0, 3.0), (4.0, 5.0, 6.0)]. The trick is to take
advantage of the Vec3Array constructor that takes just a length
argument. You get a vector full of (0.0, 0.0, 0.0) values which you
can then replace with real data via ctypes. I adapted this from
Randolph Fritz's post to osg-users (<http://www.mail-archive.com/[email protected]/msg23368.html
>).
You can do the same thing for primitive sets:
def primitiveSetFromList(primitiveType, vertexIndexList):
from ctypes import *
primitiveSet = osg.DrawElementsUInt(primitiveType,
len(vertexIndexList))
arrayPointer =
pointer(c_uint.from_address(int(primitiveSet.getDataPointer())))
offset = 0
for vertex in vertexIndexList:
arrayPointer[offset] = vertex
offset += 1
return primitiveSet
I haven't done massive testing but it's working fine so far on both
Mac OS X and Win XP…
-Frank
------------------------------------
Frank Midgley
HHMI JFRC - Scientific Computing
[email protected]
(571) 209-4629
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