Hi,
I am a bit confused about the methodology of PickShapes!
To perform a volume pick test, I am using a PickCylinderSegment to
recognize geometry for collision detection.
Volume picking seems to be more safe against numerical divergences.
The algorithm for collision detection works fine as long as the
CylinderSegment intersects edges or non parallel geometry.
But for some reasons the PickTool does not produce any intersections, if
no edge of the geometry is hit and if the *vector* between the 'start'
and 'end' of the CylinderSegment does not intersect the geometry (e.g.
quad or plane - take look at the test program).
If the vector lies in the geometry (quad or plane), then there is no
intersection available, too. But the CylinderSegment should (in my
opinion) produce intersection, at least at its boundary.
There seems to be no analytical volume test using a (existing)
PickShape.
Is this intended and if so, why should one use a PickShape at all?
There is a test program attached, which varies the attributes of the
PickCylinder.
Pick tests are applied to a quad (plane), which stands perpendicular to
the xz-plane.
The series of intersection tests correspond to the above!
Regards,
Marc
--
Marc Nienhaus
Software Engineer (Computer Graphics)
echtzeit AG. Reality Business.
Gottfried-von-Cramm Weg 35-37
14193 Berlin
fon 49 30 884 586 162
fax 49 30 884 586 22
www.echtzeit.de
Trace.java
CollisionApp.java
