Open Inventor with openmotif 2.1.30, success!

[Dennis Mikkelson <dennis@xxxxxxxxxxxxxxxxxxxxxx>]

Hi Jonathan,

  Thanks for the explanation of why NULL can't be passed as the name 
parameter to an XmCreate* routine with Motif 2.1.

  I fixed the problem with regard to "glwMDrawingAreaWidgetClass" by 
manually compiling the code in the widgets-sgi subdirectory of the 
Mesa-3.2.1 source tree, then placing object files in a library libGLw.a, 
and the header files in /usr/local/include.

  Finally, I found the cause of the problem with the sliders, color wheel 
and color patches used by the Material Editor.  When compiled against 
openmotif-2.1.30-4_MLI from Metrolink, on a generic PC with RH 6.2, the 
devices get drawn using double buffering.  After adding calls to 
glXSwapBuffers as detailed below, ALL of the Editors work perfectly. :-)  
I changed the source as follows:

1.In inventor/libSoXt/src/mixedMode/SoXtSlider.c++, add:

   glXSwapBuffers( getDisplay(), getNormalWindow() );

  as the last statement in _SoXtSlider::redraw

2.In inventor/libSoXt/src/mixedMode/SoXtColWheel.c++ replace glFlush(); with
  
   glXSwapBuffers( getDisplay(), getNormalWindow() );
 
  at the end of _SoXtColorWheel::redraw

3.In inventor/libSoXt/src/mixedMode/SoXtColPatch.c++ replace glFlush(); with

    glXSwapBuffers( getDisplay(), getNormalWindow() );

  at the end of BOTH _SoXtColorPatch::redraw and _SoXtColorPatch::setColor

I don't know what the best way to fix this in the common source tree 
would be.  Perhaps some conditional compilation option is currently not 
working as intended with the combination of libraries that I am using.

  By the way, thanks a lot for the excellent work that you and your 
colleagues have done with Open Inventor, and thanks to SGI for making 
it available under the GNU Lesser GPL.  We will be using it this semester 
in our computer graphics course.

Regards,
Dennis

--
Dennis Mikkelson
dennis@xxxxxxxxxxxxxxxxxxxxxx