Hi,If you are referring to the "slices" that you see, this is a typical artifact in volume rendering applications due to under-sampling (low number of polygon slices). A simple solution (not efficient though) is to increase the number of slices until the artifact goes away (usually 2*max_texture_dimension).There are other solutions (more efficient)out there as well...(The Real-Time volume Graphics<http://www.real-time-volume-graphics.org/>book is a great reference).If you are not talking about the slicing, it's not very clear what you mean by "And notice the head,it's a little strange" biv On Jan 10, 2008 10:59 AM, hesicong2006 <[EMAIL PROTECTED]> wrote:
> Thanks Robert and could you try my volume data? (Sorry its too big for > email, but you can download from http://www.hesicong.net/volumedata.rar) > You can see the animated failure. > I recaptured the image, P1.jpg and P2.jpg use the default setting you > provided. In P3, I decreased the sampleDensity, but it still have the > problem. > At last my computer is: > CPU: Intel Core 2 Duo Q6600 > RAM: 3G > GPU: Geforce 8800GTS 320M with 169.09 driver under XP. I think it will > not be hardware failure or driver failure. Is that caused by projection > view? I tried to modify it to ortho view, but I even can't see the > volume cube~~~ > > At last the command I use is here, thanks again for your help. > osgvolumed --shader --replace-alpha-with-luminance --images 000.TIF > 001.TIF 002.TIF 003.TIF 004.TIF 005.TIF 006.TIF 007.TIF 008.TIF 009.TIF > 010.TIF 011.TIF 012.TIF 013.TIF 014.TIF 015.TIF 016.TIF 017.TIF 018.TIF > 019.TIF 020.TIF 021.TIF 022.TIF 023.TIF 024.TIF 025.TIF 026.TIF 027.TIF > 028.TIF 029.TIF 030.TIF 031.TIF 032.TIF 033.TIF 034.TIF 035.TIF 036.TIF > 037.TIF 038.TIF 039.TIF 040.TIF 041.TIF 042.TIF 043.TIF 044.TIF 045.TIF > 046.TIF 047.TIF 048.TIF 049.TIF 050.TIF 051.TIF 052.TIF 053.TIF 054.TIF > 055.TIF 056.TIF 057.TIF 058.TIF 059.TIF 060.TIF 061.TIF 062.TIF 063.TIF > 064.TIF 065.TIF 066.TIF 067.TIF 068.TIF 069.TIF 070.TIF 071.TIF 072.TIF > 073.TIF 074.TIF 075.TIF 076.TIF 077.TIF 078.TIF 079.TIF 080.TIF 081.TIF > 082.TIF 083.TIF 084.TIF 085.TIF 086.TIF 087.TIF 088.TIF 089.TIF 090.TIF > 091.TIF 092.TIF 093.TIF 094.TIF 095.TIF 096.TIF 097.TIF 098.TIF 099.TIF > 100.TIF 101.TIF 102.TIF 103.TIF 104.TIF 105.TIF 106.TIF 107.TIF 108.TIF > 109.TIF 110.TIF 111.TIF 112.TIF 113.TIF 114.TIF 115.TIF 116.TIF 117.TIF > 118.TIF 119.TIF 120.TIF 121.TIF 122.TIF 123.TIF 124.TIF 125.TIF 126.TIF > 127.TIF 128.TIF 129.TIF 130.TIF 131.TIF 132.TIF 133.TIF 134.TIF 135.TIF > 136.TIF 137.TIF 138.TIF 139.TIF 140.TIF 141.TIF 142.TIF 143.TIF 144.TIF > 145.TIF 146.TIF 147.TIF 148.TIF 149.TIF 150.TIF 151.TIF 152.TIF 153.TIF > 154.TIF 155.TIF 156.TIF 157.TIF 158.TIF 159.TIF 160.TIF 161.TIF 162.TIF > 163.TIF 164.TIF 165.TIF 166.TIF 167.TIF 168.TIF 169.TIF 170.TIF 171.TIF > 172.TIF 173.TIF 174.TIF 175.TIF 176.TIF 177.TIF 178.TIF 179.TIF 180.TIF > 181.TIF 182.TIF 183.TIF 184.TIF 185.TIF 186.TIF 187.TIF 188.TIF 189.TIF > 190.TIF 191.TIF 192.TIF 193.TIF 194.TIF 195.TIF 196.TIF 197.TIF 198.TIF > 199.TIF 200.TIF 201.TIF 202.TIF 203.TIF 204.TIF 205.TIF 206.TIF 207.TIF > 208.TIF 209.TIF 210.TIF 211.TIF 212.TIF 213.TIF 214.TIF 215.TIF 216.TIF > 217.TIF 218.TIF 219.TIF 220.TIF 221.TIF 222.TIF 223.TIF 224.TIF 225.TIF > 226.TIF 227.TIF 228.TIF 229.TIF 230.TIF 231.TIF 232.TIF 233.TIF 234.TIF > 235.TIF 236.TIF 237.TIF 238.TIF 239.TIF 240.TIF 241.TIF 242.TIF 243.TIF > 244.TIF 245.TIF 246.TIF 247.TIF 248.TIF 249.TIF 250.TIF 251.TIF 252.TIF > 253.TIF 254.TIF 255.TIF > > Robert Osfield wrote: > > Hi, > > > > I'm the author of the osgvolume example. Its just a quick > > prototype/proof of concept, and one I haven't touched in the last year > > or two so its a bit cold. The visual errors on the frame region > > you've observed aren't ones I've seen before, but then I've never > > played with a volume dataset that has a frame in it. I'm afraid I > > can't think of any obvious failure modes that would introduce these > > artefacts. Try different hardware/OpenGL drivers/OS to see if the > > artefacts changes. As for the head region, I can't spot any problem. > > > > Robert. > > > > On Jan 10, 2008 6:40 AM, hesicong2006 <[EMAIL PROTECTED]> wrote: > > > >> Hi everyone: > >> I'm now doing a medical application using volume rendering technology. > >> osgVolume example gives me a very good start, thanks to people who > >> contributes to this example. But I found some image errors (see > >> attachments) , In p1.jpg, see the red circle, the outboder line bends. > >> In p2.jpg, the line bends more than that in p1.jpg. And notice the > head, > >> it's a little strange. I tried to fix this problem, but I still can't > >> figure out why it happens to be like this.Does someone can help me or > >> point out why it appears like this? > >> Thanks very much! > >> > >> _______________________________________________ > >> 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 > >
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