Hello,
In osgUtils::LineSegmentIntersector, there is a function "enter()" which
invokes function " intersects( node.getBound()) ". That serves to check
whether the LineSegment has intersection with the bounding sphere of the
node.
However, if I put LineSegmentIntersector into a IntersectionVisitor and
push a viewMatrix to the intersectionVisitor, which means that the
linesegment and the traversal node are not defined in reference to the
same coordinate system and the transformation is the viewmatrix. Then
problem occurs. The intersection test might not stand enter() stage,
because the lineSegment and the node to be traversed are considered to
be in the same coordinate system in function " intersects(
node.getBound()) ".
As in my program, the node is defined in global coordinate, but the
drawables are far away from the origin. The LineSegments are defined in
another coordinate system with start point (0,0,0) and a length of 200.
Only if I put a drawable at the origin of the global system, the other
drawables far away from the origin can be detected by the Linesegment,
or else nothing is detected, though they should be.
Is there something wrong with my application or is that a bug with
LineSegmentIntersector? I use osg version 3.0.0-2ubuntu1.
Thank you very much in advance!
Best regards
Shuiying
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