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<font size="-1"><font face="Verdana">Hi,<br>
(again) I solved the problem. For who's interested, here's the solution:<br>
<br>
1. use the version of IntersectWithLine returning also the id of the
intersecting cell<br>
locator->IntersectWithLine(startPnt, endPnt, tolerance,
lineParameter, intersect, paraCoord, sub_id, cellId)<br>
<br>
2. get the list of vertices of the cell:<br>
<br>
vtkIdList* nghList = vtkIdList::New();<br>
source->GetCellPoints(cellId, nghList);<br>
<br>
3. iterate through the points in order to get their texture coordinates
and interpolate them in the intersection position<br>
<br>
4. with the (interpolated) texture coordinates, access the texture
image to get the RGB point color (i use simple linera interpolation
between image pixels)<br>
<br>
bye,<br>
a.<br>
<br>
</font></font><br>
Andrea Bottino wrote:
<blockquote cite="mid:4B866B1D.40407@polito.it" type="cite">
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<font size="-1"><font face="Verdana">Hi everybody,<br>
<br>
I solved the previous problem using vtkCellLocator. for who's
interested, given a vtkPolyData source the code is:<br>
<br>
<br>
// the cell locator<br>
vtkCellLocator* locator = vtkCellLocator::New();<br>
locator->SetDataSet(source);<br>
locator->CacheCellBoundsOn();<br>
locator->AutomaticOn();<br>
locator->BuildLocator();<br>
<br>
// init the interesection parameters<br>
double tolerance = 0.001, lineParameter, intersect[3], paraCoord[3];<br>
double startPnt[3] = {// add coordinates of start point here}, <br>
endPnt[3] = {</font></font><font size="-1"><font face="Verdana">//
add coordinates of end point here</font></font><font size="-1"><font
face="Verdana">};<br>
int sub_id;<br>
<br>
<br>
if(locator->IntersectWithLine(startPnt, endPnt, tolerance,
lineParameter, intersect, paraCoord, sub_id))<br>
{<br>
printf("Point intersection: (%.2f, %.2f, %.2f)\n", intersect[0],
intersect[1], intersect[2]);<br>
// do something with the intersection point<br>
}<br>
<br>
<br>
locator->Delete();<br>
<br>
<br>
now I have a new problem (as you can see I'm not a big expert of vtk...)<br>
The vtkPolyData comes from a textured model. Is there a way to get
easily the colour of the intersection point (considering that probably
it is not a vertex of the mesh)?<br>
<br>
regards,<br>
a.<br>
<br>
<br>
</font></font>
<pre class="moz-signature" cols="72">--
Andrea Bottino
Politecnico di Torino, DAUIN
Corso Duca degli Abruzzi, 24
10129 Torino ITALY
Tel +39 011 5647175 / Fax +39 011 5647099.
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.polito.it/cgvg">http://www.polito.it/cgvg</a>
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<br>
<pre class="moz-signature" cols="72">--
Andrea Bottino
Politecnico di Torino, DAUIN
Corso Duca degli Abruzzi, 24
10129 Torino ITALY
Tel +39 011 5647175 / Fax +39 011 5647099.
<a class="moz-txt-link-freetext" href="http://www.polito.it/cgvg">http://www.polito.it/cgvg</a>
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