Hi Robert,
I got funny volume display problem on intel card (it lost some opacity
values). I checked the shader code and I found the problem on handling NaN
with using if statement.
Your code is :
" if (num_iterations<min_iterations) num_iterations =
min_iterations;\n"
" else if (num_iterations>max_iterations)
num_iterations = max_iterations;\n"
" else if (num_iterations!=num_iterations)
num_iterations = max_iterations;\n"
I checked NaN on wiki https://en.wikipedia.org/wiki/NaN. The non-signaling
value won't do standard comparison, so I changed the code as below.
" if (num_iterations!=num_iterations) num_iterations =
max_iterations;\n"
" else if (num_iterations<min_iterations)
num_iterations = min_iterations;\n"
" else if (num_iterations>max_iterations)
num_iterations = max_iterations;\n"
Check the value whether it is NaN on first condition and it works as normal
on intel card now.
Regards,
Clement
________________________________________
From: osg-users [osg-users-boun...@lists.openscenegraph.org] on behalf of
Robert Osfield [robert.osfi...@gmail.com]
Sent: Wednesday, 12 August 2015 23:58
To: OpenSceneGraph Users
Subject: Re: [osg-users] Volume image crash on the latest version of Nvidia
driver
On 12 August 2015 at 14:47, <clement....@csiro.au<mailto:clement....@csiro.au>>
wrote:
Hi Robert,
I have tested on both Intel and Nvidia machines. The solution works without
any issue. Thanks.
I have applied this fix to OSG-svn/trunk, OSG-3.2.3 and OSG-3.4.0 so we should
now be good to go.
Robert.
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