intersections line- unstructured grid

[John Biddiscombe]

>>>>
How is it possible to get the number of intersections between a
UnstructuredGrid and a line ? 
Thanks in advance
Edi.
<<<<

One way would be...

Create a cell locator->SetInput(your unbstructured grid);

Fire ray at grid using CellLocator
IntersectLine(.......)
This will return intersection t-point.

Now do this....

line from Point A -> Point B

intersection=true;
While (intersection==true) {
	Celllocator->IntersectWithLine( from A......to B)
	if (intersection found  and t>0 && t<1) {
		A = (B-A)*t (i.e. t distance (+epsilon or tolerance) along A->B)
		intersections++
	} else intersection=false;
}

It ought to work as long as you do it right!

John B

	


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