The last dataset I used was a 512-cube, stored as a vtkImageData I believe. One thing that greatly effects rendering time is the level of opacity you have. in my case, I had large regions of the space that were going to be completely transparent (accumulated opacity =
0.0), with only a small fireball in the center to render. If I adjusted my transfer function so that larger regions were rendered, then the render time increased.<br><br>Using a fixed transfer function that rendered only the small portion of the dataset I wanted to see, the FixedPoint mapper was abysmal at about 30 minutes per frame, and the ProjectedTetra mapper works in about 6 minutes (with the DataSetTriangleFilter time included). All of my stuff is non-interactive, being dumped directly to PNG images on disk.
<br><br><div><span class="gmail_quote">On 2/7/06, <b class="gmail_sendername">Mark Wyszomierski</b> <<a href="mailto:markww@gmail.com">markww@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>Hi Randall, Faith,</div>
<div> </div>
<div>I gave vtkProjectedTetrahedraMapper a try for the first time today but I experienced the longest render times with it out of any of the other mappers. I'm wondering what your input data being rendered is? Mine is a vtkImageData volume with dimensions of 256x256x56. The fixed point mapper or 3d texture mapper give me the fastest results.
<br> </div>
<div>Mark<br> </div><div><span class="e" id="q_10945a5391464c25_1">
<div><span class="gmail_quote">On 2/6/06, <b class="gmail_sendername">Randall Hand</b> <<a href="mailto:randall.hand@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">randall.hand@gmail.com
</a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;">I think the best results will actually come from using the vtkProjectedTetrahedraMapper - <a href="http://www.vtk.org/doc/release/5.0/html/a01919.html" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.vtk.org/doc/release/5.0/html/a01919.html</a><br><br>I've pretty much tried them all. The vtkVolumeRayCastMapper took about an hour to generate an image for me, the vtkFixedPointRayCastMapper cut it down to about 30 minutes. The vtkProjectedTetrahedraMapper takes the cake, however, at a whopping 5 minutes. Unfortunately, it does take alot more memory as it requires you to "tetrahedralize" your mesh.
<div><span><br><br>
<div><span class="gmail_quote">On 2/6/06, <b class="gmail_sendername"><a href="mailto:flin@enders.tch.harvard.edu" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">flin@enders.tch.harvard.edu</a></b>
<<a href="mailto:flin@enders.tch.harvard.edu" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">flin@enders.tch.harvard.edu </a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hello all,<br><br>I need some advice on how much imporvement the<br>vtkFixedPointVolumeRayCastMapper will make vs. regular
<br>vtkVolumeRayCastMapper ? I'm doing volume rendering of roughly<br>250x80x150 voxels, and the speed is unacceptable. Any suggestions on how<br>to speed up? Specifically, how to use hardware to accelerate it?<br><br>
Thanks.<br><br>/faith<br><br><br>_______________________________________________<br>This is the private VTK discussion list.<br>Please keep messages on-topic. Check the FAQ at: <a href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.vtk.org/Wiki/VTK_FAQ </a><br>Follow this link to subscribe/unsubscribe:<br><a href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://www.vtk.org/mailman/listinfo/vtkusers
</a><br></blockquote></div><br><br clear="all"><br></span></div><span>-- <br>Randall Hand <br>Visualization Scientist, <br>ERDC-MSRC Vicksburg, MS<br>Homepage: <a href="http://www.yeraze.com/" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.yeraze.com</a> </span><br>_______________________________________________<br>This is the private VTK discussion list.<br>Please keep messages on-topic. Check the FAQ at: <a href="http://www.vtk.org/Wiki/VTK_FAQ" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
http://www.vtk.org/Wiki/VTK_FAQ</a><br>Follow this link to subscribe/unsubscribe:<br><a href="http://www.vtk.org/mailman/listinfo/vtkusers" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://www.vtk.org/mailman/listinfo/vtkusers
</a><br><br><br></blockquote></div><br>
</span></div></blockquote></div><br><br clear="all"><br>-- <br>Randall Hand<br>Visualization Scientist, <br>ERDC-MSRC Vicksburg, MS<br>Homepage: <a href="http://www.yeraze.com">http://www.yeraze.com</a>