Re: [Mesa3d-users] rendering artifacts mesa vs hardware

[tom f. <tf...@al...>]

Hi Burlen!  Hope you're doing well.

burlen <bur...@gm...> writes:
> Thanks for your help,
> It didn't make a difference, but I agree it looks like depth buffer
> issue.

I think you should file a bug, not all the Mesa devs follow this list.

  https://bugs.freedesktop.org/

A (very unlikely to be enlightening) thing to try is to export:

  LIBGL_ALWAYS_SOFTWARE=1
  LIBGL_ALWAYS_INDIRECT=1
  MESA_DEBUG=1

and re-run.  Other than the libtxc warning, any errors you see on your
terminal may be relevant.

> Another issue I am seeing in the mesa rendering has to do with
> inconsistent choice of which tubes are on top. This occurs in
> parallel rendering only so I didn't mention it before. You can see
> the inconsistency by comparing the hardware/nvidia and mesa in these
> images:
> 
> http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/mesa-artifacts
> -decomp.png
> http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/nvidia-no-arti
> facts-decomp.png

It looks like these are changing per-tile -- you can see the obvious
banding along the rightmost streamlines.  Does enabing/disabling IceT
in ParaView solve the problem?  I'm guessing that will change how PV
does load decomposition as well, but if not you might want to play with
those settings.

Best,

-tom

> Jeff Lee wrote:
> > looks like a depth buffering issue - what happens when you setenv 
> > MESA_GLX_DEPTH_BITS 24?
> >
> > On Fri, Jan 15, 2010 at 12:22 PM, burlen <bur...@gm... 
> > <mailto:bur...@gm...>> wrote:
> >
> >     I would like to report an issues I see when I replace hardware
> >     rendering
> >     in my app with mesa. I am new to mesa so I am not sure where the bug
> >     lies, in the app or mesa. So I suspect it may be in mesa because
> >     hardware rendering works fine , I have doubts because I don't know if
> >     the app does anything special when it uses mesa. I hope some one here
> >     can say for sure weather or not it's a mesa issue.
> >
> >     The issue is strong artifacts appear on the surface of rendering
> >     tubes.
> >     zooming in makes the artifacts recede to the edges of the tubes but
> >     never completely go away. Here is an illustration of the artifacts
> >     and a
> >     hardware rendering that doesn't have the artifacts.
> >
> >     http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/mesa-art
> ifacts.png
> >     http://nashi-submaster.ucsd.edu/movies/PV/tube-filter-artifact/nvidia-n
> o-artifacts.png
> >
> >     By the way, I reproduced on two machines with intel and gcc
> >     compiler and
> >     two mesa version 7.5.1 and 7.7.
> >
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