The following code appears to work:
def apply_Geode(self,ge):
for i in range(ge.getNumDrawables()):
geom = ge.getDrawable(i).asGeometry()
if geom:
arr = geom.getVertexArray()
if arr.getType() != osg.Array.Vec3ArrayType:
raise LumError, 'Type of vertex array not
three-element vectors'
# aagh!
sz = arr.getDataSize()
pvec =
ctypes.pointer(c_float.from_address(int(arr.getDataPointer())))
o = 0
for i in range(arr.getNumElements()):
self.file.write(' %f %f %f\n' % (pvec[o],
pvec[o+1], pvec[o+2]))
o += sz
I do not recommend this as a coding style, but it seems to be the only
way to do this at the moment.
Randolph
Gerwin de Haan wrote:
Hi Randolph,
this is a typical problem of (python) wrappers; the "getVertexArray"
returns a general Array, which is currently not wrapped. The trick
would be to somewhere "cast" the general Array back to its specific
type in Python, e.g. a Vec3Array. We've used some of these tricks in
the wrappings themselves by a dynamic_cast through C++ run-time type
information (not accessible to users), and some you can access
yourself, e.g. osg.Node.asLOD .
To fix your particular problem we might introduce extensions to Array
such as osg.Array.asVec3Array etc, or better would be to automatically
let SWIG convert all returning values of Array to its "real" type. In
any case this means diving into SWIG specifics. I'll post this as an
issue on the list
(http://code.google.com/p/osgswig/issues/detail?id=27), but I cannot
give guarantees when it will be picked up.
Gerwin
On Thu, Feb 26, 2009 at 5:19 AM, Randolph Fritz <rfr...@u.washington.edu> wrote:
I'm writing a prototype OSG to Radiance exporter in Python. I've got to the
point of code that iterates over all geodes in the scene graph. Problem
is--then what? Is the only way to read the elements of the arrays ctype and
pointers? Or is there something a bit simpler and safer?
Perhaps-relevant bit of code:
def apply_Geode(self,ge):
for i in range(ge.getNumDrawables()):
geom = ge.getDrawable(i).asGeometry()
if geom:
arr = geom.getVertexArray()
for i in range(arr.getNumElements()):
# This doesn't seem to work--what does?
arr.accept(i,self.val)
--
Randolph Fritz
design machine group
architecture department
university of washington
rfr...@u.washington.edu
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_______________________________________________
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--
Randolph Fritz
design machine group
architecture department
university of washington
rfr...@u.washington.edu
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