pyopengl-users

[PyOpenGL-Users] How to call glMultMatrix passing an instance of KFbxXMatrix?

[Mark L. <mar...@pe...>]

Newb to both Python and OpenGL, so this may be a trivial question.

I have C sample code which looks like:

    void GlDrawCrossHair(KFbxXMatrix& pGlobalPosition)
    {
         glColor3f(1.0, 1.0, 1.0);
         glLineWidth(1.0);

         glPushMatrix();
         glMultMatrixd((double*) pGlobalPosition);
    ...

but when I try to write, in Python:


    def DrawCrosshair(pGlobalPosition):
         glColor3f(1.0,1.0,1.0)
         glLineWidth(1.0)

         glPushMatrix()
         glMultMatrixd(pGlobalPosition)



I get:

    ...
    File "C:/Users/Mark/Documents/Projects/MICA/MicaPython/Mica.py",
    line 141, in DrawCrosshair
         glMultMatrixd(pGlobalPosition)
       File "C:\Python26\lib\site-packages\OpenGL\latebind.py", line 45,
    in __call__
         return self._finalCall( *args, **named )
       File "C:\Python26\lib\site-packages\OpenGL\wrapper.py", line 569,
    in wrapperCall
         pyArgs = tuple( calculate_pyArgs( args ))
       File "C:\Python26\lib\site-packages\OpenGL\wrapper.py", line 354,
    in calculate_pyArgs
         yield converter(args[index], self, args)
       File
    "C:\Python26\lib\site-packages\OpenGL\arrays\arrayhelpers.py", line
    110, in asArraySize
         handler = typ.getHandler( incoming )
       File
    "C:\Python26\lib\site-packages\OpenGL\arrays\arraydatatype.py", line
    52, in __call__
         typ, repr(value)[:50]
    TypeError: ("No array-type handler for type <class
    'fbx.KFbxXMatrix'> (value: <fbx.KFbxXMatrix object at
    0x0000000003AE01C8>) registered", <function asArraySize at
    0x00000000035C5CF8>)
    GLUT Display callback <function display at 0x0000000003954CF8> with
    (),{} failed: returning None ("No array-type handler for type <class
    'fbx.KFbxXMatrix'> (value: <fbx.KFbxXMatrix object at
    0x0000000003AE01C8>) registered", <function asArraySize at
    0x00000000035C5CF8>)


This must be a simple operation but I cannot find any examples to go by.

I'm running on Windows Vista, Python 2.6.6, and PyOpenGl 3.0.1.


Thanks in advance,


Mark

Re: [PyOpenGL-Users] How to call glMultMatrix passing an instance of KFbxXMatrix?

[Alejandro S. <as...@gm...>]

Hello Mark,

On Sun, Sep 11, 2011 at 8:49 PM, Mark Laff
<mar...@pe...>wrote:

> **
>
> def DrawCrosshair(pGlobalPosition):
>     glColor3f(1.0,1.0,1.0)
>     glLineWidth(1.0)
>
>     glPushMatrix()
>     glMultMatrixd(pGlobalPosition)
>
> TypeError: ("No array-type handler for type <class 'fbx.KFbxXMatrix'>
> (value: <fbx.KFbxXMatrix object at 0x0000000003AE01C8>) registered",
> <function asArraySize at 0x00000000035C5CF8>)
> GLUT Display callback <function display at 0x0000000003954CF8> with (),{}
> failed: returning None ("No array-type handler for type <class
> 'fbx.KFbxXMatrix'> (value: <fbx.KFbxXMatrix object at 0x0000000003AE01C8>)
> registered", <function asArraySize at 0x00000000035C5CF8>)
>
>
The error message leads me to believe the problem is related to the type of
the pGlobalPosition variable. Is there any easy way you could convert a
"fbx.KFbxXMatrix" instance to a numpy array or a Python list?

Best,
Alejandro.-

-- 
http://alejandrosegovia.net

Re: [PyOpenGL-Users] How to call glMultMatrix passing an instance of KFbxXMatrix?

[Mark L. <mar...@pe...>]

On further investigation, the class KFbxXMatrix is part of the Autodesk 
FBX Api.  I'll check with that Discussion Group about the proper usage.

Thanks for the comments.

Mark

Re: [PyOpenGL-Users] How to call glMultMatrix passing an instance of KFbxXMatrix?

[Ian M. <geo...@gm...>]

On Sun, Sep 11, 2011 at 5:49 PM, Mark Laff
<mar...@pe...>wrote:

> **
> Newb to both Python and OpenGL, so this may be a trivial question.
>
> I have C
>
C++

> sample code which looks like:
>
> void GlDrawCrossHair(KFbxXMatrix& pGlobalPosition)
> {
>     glColor3f(1.0, 1.0, 1.0);
>     glLineWidth(1.0);
>
>     glPushMatrix();
>     glMultMatrixd((double*) pGlobalPosition);
> ...
>
>  but when I try to write, in Python:
>
>
> def DrawCrosshair(pGlobalPosition):
>     glColor3f(1.0,1.0,1.0)
>     glLineWidth(1.0)
>
>     glPushMatrix()
>     glMultMatrixd(pGlobalPosition)
>
> In your C++ code, class KFbxXMatrix probably has some specified way to
convert to an array of type double.  You'll need to do whatever the
equivalent is in Python; i.e., glMultMatrixd(*pGlobalPosition.getArray()) or
whatever.
Ian