Hi Clement, osgVolume will have very light CPU usage, but heavily taxes the GPU so the CPU usage you are seeing won't be down to osgVolume.
What might be causing the high CPU usage I cannot say, it's your hardware, your application. As a general note MFC is rather limiting, you are using a loverly portable API like the OSG then squishing it into a heap of steaming non portable legacy API. Such an approach needlessly limits your ability to port the OSG to other platforms. Robert. On 20 February 2012 05:56, <[email protected]> wrote: > Hi Robert, > > Thank you for your solution. Using SampleDensityWhenMovingProperty can > reduce the density on moving. Mouse becomes responsive on moving now. On > the cpu usage, I notice it always stays on 15-20%. I am using MFC. When I > clicked on menu bar and select menu, it is obviously delay. I guess the > problem is occurred as the following code. I am using another thread to run > the code below. > > while (!viewer->done()) { > viewer->run(); > } > > If I opened more than one sample at the same time, cpu usage will increase to > 20-30%. The whole program will be very slow. Anyway to avoid too much cpu > loading. Thanks. > > > Regards, > Clement > > > ________________________________________ > From: [email protected] > [[email protected]] On Behalf Of Robert Osfield > [[email protected]] > Sent: Friday, 17 February 2012 10:59 PM > To: OpenSceneGraph Users > Subject: Re: [osg-users] osgvolume performance > > Hi Clement, > > On 17 February 2012 01:53, <[email protected]> wrote: >> I am using MFC to display osg volume data. If the sample data is 30 * 30 >> * 20 voxel, it is quite smooth on rotating the image on viewer. If the >> sample data is 350 * 350 * 60 voxel, I can't rotate the image as smooth as >> before. If I used higher voxel data, the rotation become very hard. I >> would like to know if there is any way to improve the performance. Thanks. > > With higher res data you have to take more samples to accurately > represent the data so it takes much more work on the GPU to do it - > volume rendering is the most intensive type of rendering that graphics > card do so I'm afraid low framerate is the norm. osgVolume allows you > to alter the sample density so you can trade visual quality for speed > via the SampleDensityProperty. Press 'd' and move the mouse up and > down to alter the sample density. You can also use a > SampleDensityWhenMovingProperty to tell osgVolume to use a different > sample density when moving. > > Robert. > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
