[vtk-developers] Bug or feature in vtkPlane::IntersectWithLine ?

[Philippe Pebay]

Hello Goodwin,

Yes indeed this was initially implemented as a performance feature, for the
initial purpose was picking. However it is now a limitation as we are
increasingly doing topological analysis.

Thanks for having sent the link to your code, at which I will look. The
case which we are looking at is that of line/triangle intersection, but the
fundamentals of the issue remain the same. In fact the triangle/triangle
intersection which you wrote can be viewed as a generalization of the
triangle/line one.

Best,
Philippe

On Tue, Dec 6, 2011 at 12:58 PM, Goodwin Lawlor <goodwin.lawlor at ucd.ie>wrote:

> Hi Philippe,
>
> I hit this feature/bug a while back writing a collision detection filter -
> I presumed is was a performance feature.
>
> Have a look from line 646 here:
> https://github.com/glawlor/**VTK/blob/collision/Graphics/**
> vtkCollisionDetectionFilter.**cxx<https://github.com/glawlor/VTK/blob/collision/Graphics/vtkCollisionDetectionFilter.cxx>
>
> Basically,
>
> 1. Check if intersecting
> 2. If not intersecting then edge is parallel to plane
> 3. If two edges of triangle are parallel to plane then triangle is coplanar
> 3. If coplanar then check if the triangles are overlapping.
>
>
>
> Hth in some way,
>
> Goodwin
>
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Philippe Pébay
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