Problem with shadow render opengl

[Daniele C. <dca...@in...>]

For obtain an image with a good resolution I use TQ3PixmapDrawContextData.
It is work fine but if I use Quesa shared render opengl I don't see shadow.
The function is this:
/
TQ3DrawContextObject MyNewDrawContext(long larg,long alt)
{
    TQ3PixmapDrawContextData myDrawContextData;
    CRect                    srcRect ;
    TQ3ColorARGB                coloreSfondo;

    coloreSfondo.r=(float) (GetRValue(gPOG.coloreSfondo3D)/255.);//copia 
RGBColor in TQ3ColorRGB É
    coloreSfondo.g=(float) (GetGValue(gPOG.coloreSfondo3D)/255.);//É 
convertendo dal range 0..65535 É
    coloreSfondo.b=(float) (GetBValue(gPOG.coloreSfondo3D)/255.);//É al 
range 0,0..1,0
    coloreSfondo.a=1;// alfa channel = 1 (solid)
   

    myDrawContextData.drawContextData.clearImageMethod = 
kQ3ClearMethodWithColor;
    myDrawContextData.drawContextData.clearImageColor  = coloreSfondo;
    myDrawContextData.drawContextData.paneState = kQ3False;
    myDrawContextData.drawContextData.maskState = kQ3False;
    myDrawContextData.drawContextData.doubleBufferState = kQ3False;
    srcRect.SetRect(0,0,larg,alt);
    myDrawContextData.pixmap.width = srcRect.right  - srcRect.left;
    myDrawContextData.pixmap.height= srcRect.bottom - srcRect.top;

    myDrawContextData.pixmap.pixelSize=32;
    myDrawContextData.pixmap.rowBytes = 
Pixmap_GetRowBytes(myDrawContextData.pixmap.width,myDrawContextData.pixmap.pixelSize);

    myDrawContextData.pixmap.pixelType = kQ3PixelTypeRGB32;
    myDrawContextData.drawContextData.paneState=kQ3True;
    myDrawContextData.drawContextData.pane.min.x=(float)srcRect.left;
    myDrawContextData.drawContextData.pane.min.y=(float)srcRect.top;
    myDrawContextData.drawContextData.pane.max.x=(float)srcRect.right;
    myDrawContextData.drawContextData.pane.max.y=(float)srcRect.bottom;

    myDrawContextData.pixmap.bitOrder  = kQ3EndianLittle;
    myDrawContextData.pixmap.byteOrder = kQ3EndianLittle;


    pBits = (BYTE*) 
malloc(myDrawContextData.pixmap.rowBytes*myDrawContextData.pixmap.height);
    
::ZeroMemory(pBits,myDrawContextData.pixmap.rowBytes*myDrawContextData.pixmap.height);

    myDrawContextData.pixmap.image = pBits ;


    return Q3PixmapDrawContext_New(&myDrawContextData);
}
/

It Maybe the problem is not here.
Have you some advice?
Thanks