HI All I posting this for one of my folks who's is having some erratic results when using a long vertical line segment and the standard osgUtil::LineSegmentIntersector Basically when he sets a line segment up with end X,Y, 1000000 and start X,Y, -1000000 , occasionally we fail to get a hit even though we are in the middle of the terrain skin, although moving the X,Y several meters in any direction and we get a hit. If we reduce the Z of the line segment to 500k and -500k this happens less errant fails, if we reduce the Z's to 1k, -1k then we never get a fail, further when we are failing with the intersections if the camera is further away from the intersection the less fails we get, the more we move closer to the intersection point the more fails we get. Our Near and Far clip are fixed, 1 to 10-20k , the terrain skin is stanard OSG geometry, nothing fancy, some lods, but the level and which lod is showing does not seem to be the issue I'm at at a loss to why this may be happening, we are not doing anything out the oridnary in this case that I can think that would cause this erratic behaviour , any one seen anything like this before ? thanks
Gordon Product Manager 3d __________________________________________________________ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com __________________________________________________________ (C): (+1) 571-265-2612 (W): (+1) 703-437-7651 "Self defence is not a function of learning tricks but is a function of how quickly and intensely one can arouse one's instinct for survival" - Master Tambo Tetsura
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