added vtHeightFieldGrid3d::LineOfSight re-worked vtHeightFieldGrid3d::CastRayToSurface to not give up after 1000 steps
added vtHeightFieldGrid3d::LineOfSight
re-worked vtHeightFieldGrid3d::CastRayToSurface to not give up after 1000 steps

nakijun/vtp,seanisom/vtp,nakijun/vtp,seanisom/vtp,markraz/vtp,nakijun/vtp,nakijun/vtp,seanisom/vtp,seanisom/vtp,markraz/vtp,markraz/vtp,markraz/vtp,seanisom/vtp,nakijun/vtp,markraz/vtp