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[顺子 <>]

hello everyone:

i came accross a strange problem with line face circulator.

here i constructed a 50*50 grid (both x coordinate and y coordinate is from 0 to 49 ),use its grid points as input points  to make a triangulation, but when i query like this :

Line_face_circulator lfc = tri.line_walk(linestart,linedest,fh);

with linestart as  (2.01,10)

linedest as (2.01,50)

it seems that the faces intersect with the line defined by linestart and linedest before the point linestart cannt be got through the Line_face_circulator

but

with linestart as  (2,10)

linedest as (2,50)

(both are grid points)

it works very well

 

thanks very much.