[Visualpython-users] Errors in shader program

[Dunning, R. <dun...@lo...>]

Hello,

First let me apologize if this has already been covered by recent traffic on the list.  I've been working with VPython for several years, mostly in research projects with undergraduate physics majors.  I wrote the VPNBody solar system dynamics package that's linked through the VPython website.

I'm currently working on a Dell laptop with an NVidia graphics card.  With the newest version of VPython, all my programs are producing a long output of warning messages to the Shell window.  The output starts with this:

-------------------

VPython WARNING: errors in shader program:
Fragment info
-------------
Internal error: assembly compile error for fragment shader at offset 1742:
-- error message --
line 56, column 7:  error: invalid destination variable
line 63, column 13:  error: invalid operand variable

------------------

Eventually, the output identifies my graphics card:

-------------------

-- internal assembly text --
!!ARBfp1.0
OPTION NV_fragment_program2;
# cgc version 1.5.0000, build date May  1 2006 16:21:37
# command line args: 
#vendor NVIDIA Corporation
#version 1.0.02
#profile fp40
#program main

----------------------

My programs run normally except for the text dumped to the shell window.  I have attempted to update the driver for my graphics card, but I already have the latest driver according to the Dell website.

The warning messages do not appear to be relevant for what I'm trying to do with VPython.  But they interfere badly with screen prompts and other information that I send to the shell window.  I am wondering if there is a way to suppress these messages in the shell window? Or any other fixes?

Thanks.

--
Rodney Dunning
Assistant Professor of Physics
Longwood University