"From these faces I choose the one that is nearer to the<br>
end point of the ray and the next cell to search is the cell adjacent to the chosen face."<br><br>What does it mean to have a face nearer to an end point? How are you determining this? This is not as straight frward as it sounds and could be an issue.<br>
<br>W<br><br><div class="gmail_quote">2008/7/1 Kaushik . <<a href="mailto:shekhar.kaushik@gmail.com">shekhar.kaushik@gmail.com</a>>:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi<br><br>I am trying to implement the following algorithm and I am stuck. I need to cast rays<br>from each pixel into a dataset. Along each ray , I need to find the first cell that satisfies<br>some characteristics. I go about implementing it as follows :<br>
Using the vtkCellLocator::IntersectWithLine() , i find the first cell the ray intersects in the dataset.<br>If this cell satisfies the conditions , we exit. <br>else we continue searching cells along the ray until one such cell is found , or until we eventually reach <br>
the boundary of the dataset.<br>Now this searching cell along a ray is causing me trouble. Given the first cell that the ray intersected,<br>I find the faces of the cell that the ray intersects. From these faces I choose the one that is nearer to the<br>
end point of the ray and the next cell to search is the cell adjacent to the chosen face.<br>The algorithm seems to be correct logically atleast.<br><br>The vtkCell::IntersectWithLine() functions however seem to be giving inconsistent results ! Are there<br>
any known issues with these functions ? Please advise.<br><br>Also can you please comment on the algorithm above ? Is there any other way( better ? ) to do the same ?<br><font color="#888888"> <br>--<br>shekhar
</font><br>_______________________________________________<br>
vtk-developers mailing list<br>
<a href="mailto:vtk-developers@vtk.org">vtk-developers@vtk.org</a><br>
<a href="http://www.vtk.org/mailman/listinfo/vtk-developers" target="_blank">http://www.vtk.org/mailman/listinfo/vtk-developers</a><br>
<br></blockquote></div><br><br clear="all"><br>-- <br>William J. Schroeder, PhD<br>Kitware, Inc.<br>28 Corporate Drive<br>Clifton Park, NY 12065<br><a href="mailto:will.schroeder@kitware.com">will.schroeder@kitware.com</a><br>
<a href="http://www.kitware.com">http://www.kitware.com</a><br>518-371-3971 (phone and fax)