[Bf-committers] MSVC official builds, optimisation and render errors

[Simon Clitherow]

Hi,

Tested this today with VS2005 and the error occurs when using /O2 
optimization.  When using no optimization or /O1, the error is gone. VC 
is not performing any other fancy optimizations beyond these flags.  
I've played around with floating-point precision flags, inline expansion 
flags, etc, but nothing seems to touch it.

So, the question is - do we resort to /O1 for this windows release?

Does anyone have thoughts on this?  When did this error first appear?

Simon

Matt Ebb wrote:
> Hi,
>
> I've seen a few posts around the forums and in the bug tracker about 
> render errors when using raytracing, in the form of black or white 
> dots. I'd never experienced that myself (using mainly OS X and cygwin 
> builds), and when I downloaded one of the test files on the tracker, I 
> couldn't reproduce the bug either.
>
> This led me to guess that the problem may be due to the official MSVC 
> build, and perhaps some sort of optimisation difference there. In a 
> recent thread about this issue [1] I suggested that the person 
> experiencing the problem try a cygwin build that I made, and his 
> problem went away.
>
> Could the person who's doing the official BF Windows builds with MSVC 
> please check on this? One of the bug reports is in the tracker [2] 
> with a link to a test file. I think it would be a good idea to try 
> that file, see if you can reproduce the bug, and check with various 
> compiler settings to see if that has any effect. It would be very 
> unfortunate to have this quite serious problem in 2.45 as well.
>
> cheers,
>
> Matt
>
>
>
> [1] http://blenderartists.org/forum/showthread.php?p=917833#post917833
> [2] https://projects.blender.org/tracker/index.php?func=detail&aid=6861&group_id=9&atid=125 
> <https://projects.blender.org/tracker/index.php?func=detail&aid=6861&group_id=9&atid=125>
>
> ------------------------------------------
> Matt Ebb . matt at mke3.net . http://mke3.net
>
>
>
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